DPD-F1 - Measuring device PCE Instruments - Free user manual and instructions

USER MANUAL DPD-F1 PCE Instruments

Output and control options

DIGITAL PANEL METERS

PANEL METERS. OUTPUT AND CONTROL OPTIONS

Modular output and control options for panel meters from series PCE-DPD (except PCE-DPD-U). Relay outputs, transistor outputs, SSR control outputs, analog outputs, Modbus RTU communications, RS-485 and RS-232 communications.

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Index

1.1 Read this first 2
1.2 Modular architecture. 2
1.3 Installation and start-up 2
1.4 To open the housing 3
1.5 Internal modules 3
1. Options PCE-DPD/R, PCE-DPD/T and PCE-DPD/SSR ..... 4
2. Option PCE-DPD/AV 5
2.1 Configuration menu 6
2.2 Error codes 6
3. Option PCE-DPD/MB 7
3.1 Accessible registers. 7
3.2 Configuration menu 8
3.3 Exception codes. 8
3.4 Description and example of registers ..... 9
4. Option PCE-DPD/485. 10
4.1 Accessible registers.....10
4.2 Configuration menu 11
4.3 Frame types....12
4.4 Frame structure.....12
4.5 Error codes .....12
4.7 Frame examples 13
4.7.1 Frames 'RD' (36) and 'ANS' (37) ..... 13
4.7.2 Frames 'ERR' (38) ..... 13
4.7.3 Frames 'PING' (32) and 'PONG' (33). . . . . . . . . 13
4.6 CRC calculation .....13
5. Option PCE-DPD/232. 14

1.1 Read this first

All modules mentioned in this document are compatible with digital panel meters PCE-DPD series (except multiinput panel meter PCE-DPD-U). Different series differ in the number of digits, the digit height and the number of output and control options they can accept.

The output and control modules mentioned in this document, are covered by the warranty of the instrument where they are installed. Check the user's manual of the instrument for more information related to warranty.

The user's manual of the instrument where the module is installed, has important information related to installation that applies also to the output and control modules mentioned in this document. Check the user's manual of the content for more information related to installation precautions.

The output and control modules mentioned in this document are covered by the 'CE declaration of conformity' of the instrument where they are installed. Check the user's manual of the instrument for more information related to declaration of conformity.

1.2 Modular architecture

Digital panel meters from series M, K and S are designed following a modular architecture that allows the operator to install any od the output and control modules mentioned in this document.

1.3 Installation and start-up

To install an optional output and control module into a digital panel meter from series PCE-DPD:

1. open the housing of the instrument (see section 1.4)
2. install the module at slot Opt.1', 'Opt.2' or 'Opt.3' as preferred and close the instrument
3. close the housing of the instrument (see section 1.4)
4. if needed, configure the appropriate jumpers at the module

5. connect the signal output terminals

6. configure the parameters at the 'Configuration menu'.

7. modules PCE-DPD/R, T1 and SSR are configured from the alarms menu of the instrument where the module has been installed

8. other modules are configured from its own configuration menu, accessible from menu entries 'Opt.1', 'Opt.2' or 'Opt.3', depending on the slot where the module has been installed.

1.4 To open the housing

To open the housing and access the internal circuits, use a flat screwdriver to unlock clips 'D', 'C', 'B' and 'A', in this order. Remove the front filter. Let the inside of the instrument slide out of the housing.

To reinsert the instrument make sure that all modules are correctly connected to the pins on the display module. Place all the set into the housing, assuring that the modules correctly fit into the internal guiding slides of the housing. Once introduced, place again the front filter at cover 'X', and then insert clips 'A', 'B', 'C' and 'D', in this order.

Risk of electric shock. Removing the front cover will grant access to the internal circuits. Disconnect the power and the input signal to prevent electric shock to the operator. Operation must be performed by qualified personnel only. Observe precautions for handling ESD (electrostatic discharge) sensitive devices

Technical diagram of a computer rack with labeled components A, B, C, and D, showing internal structure and mounting points.

1.5 Internal modules

graph TD
    A["Input Module"] --> B["Power module"]
    B --> C["Control module"]
    C --> D["Output and control modules"]
    subgraph Power module
        E["Signal module"]
        F["Power module"]
    end
    subgraph Signal module
        G["Signal module"]
        H["Signal module"]
    end
    I["Output and control modules"] --> J["Output and control modules"]
    style A fill:#f9f,stroke:#333
    style B fill:#ccf,stroke:#333
    style C fill:#cfc,stroke:#333
    style D fill:#fcc,stroke:#333
    style E fill:#ffc,stroke:#333
    style F fill:#fcc,stroke:#333
    style G fill:#ffc,stroke:#333
    style H fill:#fcc,stroke:#333
    style I fill:#fff,stroke:#333
    style J fill:#fff,stroke:#333
    subgraph Power module
        K["Power module"]
        L["Power module"]
    end
    subgraph Signal module
        M["Signal module"]
        N["Signal module"]
        O["Signal module"]
        P["Signal module"]
    end
    subgraph Power module
        Q["Power module"]
        R["Power module"]
        S["Power module"]
    end
    subgraph Signal module
        T["Signal module"]
        U["Signal module"]
        V["Signal module"]
        W["Signal module"]
        X["Signal module"]
    end
    subgraph Power module
        Y["Power module"]
        Z["Power module"]
        AA["Power module"]
    end
    subgraph Signal module
        AB["Signal module"]
        AC["Signal module"]
        AD["Signal module"]
        AE["Signal module"]
        AF["Signal module"]
    end

1. Options PCE-DPD/R, PCE-DPD/T and PCE-DPD/SSR

Modules PCE-DPD/ALr1, PCE-DPD/T and PCE-DPD/SSR provide 1 digital 'on/off' output. The output is configured from the alarms configuration menu ('ALr.1', 'ALr.2' or 'ALr.3') of the instrument where the module is installed.

The menu allows to configure the setpoint, hysteresis, independent activation and deactivation delays, and a second setpoint to create

Option PCE-DPD/R

Output type relay

Relay type

3 contact relay (NC, NO, common)

Maximum current 8 A (resistive load)

Maximum voltage 250 Vac continuous

Isolation 3500 Veff

Type of terminal plug-in screw terminal pitch 5.08 mm

Installation allowed at 'Opt.1', 'Opt.2', 'Opt.3'

Option PCE-DPD/T

Output type transistor

Maximum voltage 35 Vdc

Maximum current 50 mA

Isolation 3500 Veff

Type of terminal plug-in screw terminal pitch 5.08 mm

Installation allowed at 'Opt.1', 'Opt.2', 'Opt.3'

Option PCE-DPD/SSR

Output type to control a SSR relay

Output voltage +15 Vdc

Maximum current 45 mA

Isolation 1000 Vdc

Type of terminal plug-in screw terminal pitch 5.08 mm

Installation allowed at 'Opt.1', 'Opt.2', 'Opt.3'

alarm windows.

Modules PCE-DPD/R, PCE-DPD/T and PCE-DPD/SSR are isolated against all other instrument circuits, and isolated between them.

Note : for more than three relays per instrument or higher relay density per module, see special modules R2, R4 and R6.

'com' ('A') 'NC' ('C') 'NO' ('B')

Module PCE-DPD/R output schematics

Electrical circuit diagram with diode and transistor symbols labeled A', B'

Module PCE-DPD/T output schematics

+15 Vdc 'C' SSR relay 'B' 'A'

Module PCE-DPD/SSR output schematics

graph TD
    subgraph Opt.1
        A["Component A"] --> B["Component B"]
        C["Component C"] --> D["Component D"]
        E["Component E"] --> F["Component F"]
    end
    subgraph Opt.2
        G["Component A"] --> H["Component B"]
        I["Component B"] --> J["Component C"]
        K["Component C"] --> L["Component D"]
        M["Component D"] --> N["Component E"]
    end
    subgraph Signal
        O["Signal Block"] --> P["Component P"]
        Q["Component Q"] --> R["Component R"]
        S["Component S"] --> T["Component T"]
    end
    subgraph Power
        U["Power Block"] --> V["Component V"]
        W["Component W"] --> X["Component X"]
        Y["Component Y"] --> Z["Component Z"]
    end

Rear view

2. Option PCE-DPD/AV

Module PCE-DPD/AV provides 1 analog output configurable as 4/20 mA or 0/10 Vdc. The output is configured from the options configuration menu ('Opt.1', 'Opt.2' or 'Opt.3') of the instrument where the module is installed.

The output signal is proportional to the reading and it can be configured for direct (positive) and inverted (negative) slopes. It accepts connection for active and passive current loops.

Modules AO are isolated against all other instrument circuits.

Option PCE-DPD/AV

Output type analog output

Output signals 4/20 mA active

4/20 mA passive

0/10 Vdc

Max. signal output 22 mA, 10.5 Vdc

Min. signal output 0 mA, -50 mVdc

Scaling related to the instruments reading direct or inverse slope

Vexc (terminal A) +13.8 Vdc ± 0.4 Vdc (max. 25 mA) protected against short circuit

Load impedances ≤350 Ohms (in 4/20 mA active) ≤800 Ohms (in 4/20 mA passive) (with a 24 Vdc external Vexc) (maximum 27 Vdc between terminals 'B' and 'C') ≥10 KOhms (in 0/10 Vdc)

Accuracy (at 25 °C) <0.1 % FS

Thermal stability 60 ppm/°C in mA mode 50 ppm/°C in Vdc mode

Step response <75 mSeconds + meter step response (0% to 99% signal)

Isolation 1000 Vdc

Warm-up 15 minutes

Type of terminal pitch 5.08 mm plug-in screw terminal

Factory configuration 'Mode mA' 'Scaling 0/9999 = 4/20 mA'

'On error to high level('to_h')'

Installation allowed at 'Opt.1', 'Opt.2', 'Opt.3'

- Mode 4/20 mA active

The current loop is powered from the 'PCE-DPD/AV' module

graph TD
    A["Block A"] --> B["Block B"]
    B --> C["Block C"]
    D["Jumper 'M' closed"] --> A
    E["Signal"] --> B
    F["Vexc."] --> B

- Mode 4/20 mA passive

The current loop is powered from an external equipment

graph TD
    A["Jumper 'M' closed"] --> B["Signal-"]
    A --> C["Signal+"]
    B --> D[Box 1 Box 2 Box 3 Box 4 Box 5 Box 6 Box 7 Box 8 Box 9 Box 10 Box 11 Box 12 Box 13 Box 14 Box 15 Box 16 Box 17 Box 18 Box 19 Box 20 Box 21 Box 22 Box 23 Box 24 Box 25 Box 26 Box 27 Box 28 Box 29 Box 30 Box 31 Box 32 Box 33 Box 34 Box 35 Box 36 Box 37 Box 38 Box 39 Box 40 Box 41 Box 42 Box 43 Box 44 Box 45 Box 46 Box 47 Box 48 Box 49 Box 50 Box 51 Box 52 Box 53 Box 54 Box 55 Box 56 Box 57 Box 58 Box 59 Box 60 Box 61 Box 62 Box 63 Box 64 Box 65 Box 66 Box 67 Box 68 Box 69 Box 70 Box 71 Box 72 Box 73 Box 74 Box 75 Box 76 Box 77 Box 78 Box 79 Box 80 Box 81 Box 82 Box 83 Box 84 Box 85 Box 86 Box 87 Box 88 Box 89 Box 90 Box 91 Box 92 Box 93 Box 94 Box 95 Box 96 Box 97 Box 98 Box 99

- Mode 0/10 Vdc

graph TD
    A["M V"] --> B["Com."]
    A --> C["Signal"]
    D["Jumper 'V' closed"] --> B
    B --> E["Output"]
    style A fill:#f9f,stroke:#333
    style D fill:#ccf,stroke:#333
    style E fill:#cfc,stroke:#333

Terminal A Vexc

Terminal B Signal (mA or Vdc)

Terminal C GND

Jumper M closed for 'mA'

Jumper V closed for 'Vdc'

graph TD
    subgraph Opt.1
        A["MV A B C"] --> B["Square"]
        C["MV A B C"] --> D["Square"]
        E["MV A B C"] --> F["Square"]
    end
    subgraph Opt.2
        G["MV A B C"] --> H["Square"]
        I["MV A B C"] --> J["Square"]
        K["MV A B C"] --> L["Square"]
    end
    M["Opt.3"] --> N["Signal"]
    O["Opt.3"] --> P["Power"]

Rear view

2.1 Configuration menu

Configure at menu 'Mode' ('ModE') the output signal range to '4/20 mA' ('mA') or '0/10 Vdc' ('Vdc'). Position for jumpers 'V' and 'M' must be according to the range selected.

At menu 'Scaling' ('ScAL') configure the values that define the two points ('high' and 'low') of the 'signal-reading' slope:

• the lower slope point, defined by 'Display low' ('d.Lo') and 'Output low' ('Ao.Lo')
• the higher slope point, defined by 'Display high' ('d.hI') and 'Output high' ('Ao.hI')

Analog output values are shown with 'XX.XX' format, acceptable values are '0.00' to '10.00' Vdc for voltage, and '0.00' to '20.00' mA for current.

graph TD
    A["opt1"] --> B["Node"]
    B --> C["NA"]
    C --> D["Mode 4/20 mA"]
    C --> E["Udc"]
    E --> F["Scaling"]
    F --> G["dLo"]
    G --> H["Display low"]
    H --> I["RoLo"]
    I --> J["Output low"]
    J --> K["dhi"]
    K --> L["Display high"]
    L --> M["Rohl"]
    M --> N["Output high"]
    N --> O["----"]
    O --> P["on.Er"]
    P --> Q["'On error'"]
    Q --> R["FACT"]
    R --> S["Factory configuration"]
    S --> T["UEr"]
    T --> U["HHHH"]
    U --> V["Version"]
    style A fill:#f9f,stroke:#333
    style V fill:#ccf,stroke:#333

2.2 Error codes

'Er.34' output signal configured to value lower than 0 Vdc or 0 mA 'Er.35' output signal configured to a value higher than 10 Vdc or 20 mA

'Er.36' configured slope points are not acceptable, such as: 'd.Hi'='d.Lo'

'Ao.Hi'='Ao.Lo' ('Ao.Hi'-'Ao.Lo')>'(d.Hi'-d.Lo')

3. Option PCE-DPD/MB

Module PCE-DPD/MB provides 1 Modbus RTU communications port. Using protocol function '4' ('Read Input Registers') the instrument registers are accessible (reading value, alarm status, memory of maximum and minimum, setpoint values, ...)

The protocol parameters are configured from the options configura-

Option PCE-DPD/MB

Output type Modbus RTU communication port

Function implemented 4 (Read_Input_Registers)

Addresses 01 to 247

Exception codes see section 3.3

Registers* see section 3.1

*available registers can vary for different models

Bus RS-485

speed 57.6 Kbps to 600 bps

Data format 8n1 (standard), 8o1, 8n2, 8e1

bus terminator not included

Isolation 1000 Vdc

Configuration 3 button front keypad

Temperature operation from 0 to 50 °C

storage from -20 to +70 °C

Factory configuration 'Address 1'

'Speed 19.2 Kbps'

'Format 8n1'

'Decimal point Auto'

Installation allowed at 'Opt.1', 'Opt.2', 'Opt.3'

tion menu ('Opt.1', 'Opt.2' or 'Opt.3') of the instrument where the module is installed.

Modules are isolated against all other instrument circuits.

Terminal B RS-485 bus 'B' signal

Terminal A RS-485 bus 'A' signal

Terminal G GND

graph TD
    subgraph Opt.1
        A["Block B"] --> B["Component 1"]
        C["Block B"] --> D["Component 2"]
        E["Block B"] --> F["Component 3"]
    end
    subgraph Opt.2
        G["Block B"] --> H["Component 1"]
        I["Block B"] --> J["Component 2"]
        K["Block B"] --> L["Component 3"]
    end
    subgraph Opt.3
        M["Block B"] --> N["Component 1"]
        O["Block B"] --> P["Component 2"]
        Q["Block B"] --> R["Component 3"]
    end
    A --> M
    C --> O
    E --> K
    G --> M
    I --> N
    K --> P
    M --> Q
    N --> Q
    style Opt.1 fill:#f9f,stroke:#333
    style Opt.2 fill:#f9f,stroke:#333
    style Opt.3 fill:#ccf,stroke:#333

Rear view

3.1 Accessible registers

Register	Name	Description	Size	Refresh	Value : Series M	Value : Series K and S
0	DISPLAY1_L	Display value	16 bits	same as display	999999 to -199999	9999 to -1999
1	DISPLAY1_H		16 bits
2	DECIMALS1	Decimals on display	16 bits		0 to 6	0 to 4
3	MAXMEM_L	Memory of maximum	16 bits	every 30 seconds	999999 to -199999	9999 to -1999
4	MAXMEM_H		16 bits
5	MINMEM_L	Memory of minimum	16 bits		999999 to -199999	9999 to -1999
6	MINMEM_H		16 bits
7	SETPOINT1_L	Setpoint 1 value	16 bits	every 2 seconds	999999 to -199999	9999 to -1999
8	SETPOINT1_H		16 bits
9	SETPOINT2_L	Setpoint 2 value	16 bits		999999 to -199999	9999 to -1999
10	SETPOINT2_H		16 bits
11	SETPOINT3_L	Setpoint 3 value	16 bits		999999 to -199999	9999 to -1999*
12	SETPOINT3_H		16 bits
13	STATUS	Alarm status Instrument status	16 bits	same as display	bit 0...7 alarm status bit 8...16 instrument status
14 a 16	Reserved	Reserved	16 x 3 bits		Not accessible	Not accessible

Table 1 - Registers accessible via MODBUS-RTU
All registers codified as binary numbers. Negative values are codified in two's complement. Available registers can vary for different models. Register 11 is not accessible to instruments from series S (limited to 2 output and control option modules)

3.2 Configuration menu

graph TD
    A["opt1"] --> B["rtu Configuration"]
    B --> C["Addr Address"]
    C --> D["6Aud Speed (kbps)"]
    D --> E["57.6 1 to 247"]
    D --> F["38.4 57.6 Kbps ... to 600 bps"]
    D --> G["19.2"]
    G --> H["9.6"]
    H --> I["4.8"]
    I --> J["2.4"]
    J --> K["1.2"]
    K --> L["0.6"]
    L --> M["---"]
    D --> N["bits Format"]
    N --> O["8n1 8 bits, no parity, 1 stop"]
    N --> P["8E1 8 bits, even parity, 1 stop"]
    N --> Q["8o1 8 bits, odd parity, 1 stop"]
    N --> R["8n2 8 bits, no parity, 2 stop"]
    N --> S["---"]
    T["tools"] --> U["dP"]
    U --> V["Auto AutomaticDecimal point"]
    V --> W["7Anl Manual 8.8.8.8.8 Move with LE"]
    U --> X["FACT Factory configuration"]
    X --> Y["no YES"]
    Y --> Z["UEr Version HHHH"]
    Z --> AA["---"]

Configure at menu 'Configuration' ('rtu'), the address value between '1' and '247' at parameter 'Address' ('Addr'), bus speed in kbps at parameter 'Speed' ('bAud') and data format at parameter 'Format' ('bltS').

Special tools are grouped inside the 'Tools' ('TooL') menu.

• the 'Decimal point' ('dP') menu is provided for compatibility with ancient hardware that does not support decimal point retransmission. By default, select 'Automatic' ('Auto'). If your instrument does nos transmit the decimal point position, select 'Manual' ('MAnL') and fix the position of the decimal point manually.
• at the 'Factory reset' ('FAct') menu, select 'yes' to load the default factory configuration for the instrument.

the 'Version' ('VEr') menu informs of the current firmware version installed in the module.

3.3 Exception codes

The Modbus RTU protocol defines the following scenarios when a 'Master' is sending a frame to a 'Slave':

• the 'Slave' device receives the frame correctly and replies with the requested data
• the 'Slave' devices detects a CRC error, parity error, or other. and discards the frame without generating a reply frame. The 'Master' will detect a 'TIMEOUT' condition due to the absence of reply.
• the 'Slave' device receives the frame correctly, but replies with an 'EXCEPTION_CODE' as it can not process the function or register requested.

The 'EXCEPTION_CODES' configured in the RTU module are :

Exception code	Name Description
0 ILLEGAL_FUNCTION		Requested function is not supported
1 ILLEGAL_DATA_ADDRESS		Requested register is not supported
Table 2 - Exception codes

3.4 Description and example of registers

Register R0 and R1 (DISPLAY1\_L and DISPLAY1\_H)

Contains the display value of the instrument, codified in two registers of 16 bits each. Possible values are from 999999 to -199999. Decimal point position is codified on register R2.

$$ \text { Example } R 0 = F B F 1 (\text { hex }) \text { and } R 1 = 0 0 0 9 (\text { hex }) $$

$$ \text { Register value } = 0 0 0 9 \text { FBF1 (hex) } $$

$$ \text { Reading value } = 6 5 4 3 2 1 $$

Register R2 (DECIMALS1)

Contains the number of decimals of the display, codified in a single register of 16 bits. Possible values are from 0 to 6.

$$ \text { Example } R 2 = 0 0 0 2 (\text { hex }) $$

$$ \text { Number of decimals } = 2 = 6 5 4 3. 2 1 $$

Register R3 and R4 (MAXMEM\_L and MAXMEM\_H)

Contains the memory of maximum reading of the instrument, codified in two registers of 16 bits each. Possible values are from 999999 to -199999. Decimal point position is codified on register R2.

Example - same example as in R0 and R1 but accessing to R3 and R4.

Register R5 and R6 (MINMEM\_L and MINMEM\_H)

Contains the memory of minimum reading of the instrument, codified in two registers of 16 bits each. Possible values are from 999999 to -199999. Decimal point position is codified on register R2.

Example - same example as in R0 and R1 but accessing to R5 and R6.

Register R7 and R8 (SETPOINT1\_L and SETPOINT1\_H)

Contains the setpoint value of alarm 1, codified in two registers of 16 bits each. Possible values are from 999999 to -199999. Decimal point position is codified on register R2.

Example - same example as in R0 and R1 but accessing to R7 and

R8.

Register R9 and R10 (SETPOINT2\_L and SETPOINT2\_H)

Contains the setpoint value of alarm 2, codified in two registers of 16 bits each. Possible values are from 999999 to -199999. Decimal point position is codified on register R2.

Example - same example as in R0 and R1 but accessing to R9 and R10.

Register R11 and R12 (SETPOINT3\_L and SETPOINT3\_H)

Contains the setpoint value of alarm 3, codified in two registers of 16 bits each. Possible values are from 999999 to -199999. Decimal point position is codified on register R2.

Example - same example as in R0 and R1 but accessing to R11 and R12.

Register R13 (STATUS)

Information bit-by-bit, for the alarm status (on / off) and instrument status. See below for a description.

Bit 0 Alarm 1 status (0 = inactive, 1 = active)

Bit 1 Alarm 2 status (0 = inactive, 1 = active)

Bit 2 Alarm 3 status (0 = inactive, 1 = active)

Bit 3 a 7 Reserved

Bit 8 Display overrange

Bit 9 Display underrange

Bit 10 Lost communication with the main processor

Bit 11 to 15 Reserved

Registers R14, R15 and R16

Reserved

4. Option PCE-DPD/485

Module PCE-DPD/485 provides 1 RS-485 ASCII communications port. Protocol with 'master' - 'slave' architecture, addressable up to 31 modules. Frames codified in representable ASCII characters (codes 32 to 255), which are visible using 'hyperterminal' or similar programs.

Instrument registers are accessible through the RS-485 ASCII port (reading value, alarm status, memory of maximum and minimum, set-

Option PCE-DPD/485

Output type RS-485 ASCII communication port

Bus RS-485

Speed 57.6 Kbps to 600 bps

Data format 8n1 (standard), 8o1, 8n2, 8e1

Protocol ASCII

Architecture 'master-slave'

Addresses 01 to 31

'Broadcast' address 128

Registers* see section 4.1

*available registers can vary for different models

Isolation 1000 Vdc

Configuration 3 button front keypad

Temperature operation from 0 to 50 °C

storage from -20 to +70 °C

Factory configuration‘Address	‘Mode1’	Slave’
	‘Speed‘Format	19.2 Kbps’8n1’
‘Decimal pointconfiguration ‘Master’‘Frequencytools	Auto’‘Destination address0.5 seconds’	31’
	‘Decimal point‘Legacy	Auto’Off’
‘Answer delayInstallation allowed at	0 mSeconds’‘Opt.1’, ‘Opt.2’, ‘Opt.3’

point values, ...)

The protocol parameters are configured from the options configuration menu ('Opt.1', 'Opt.2' or 'Opt.3') of the instrument where the module is installed.

Modules PCE-DPD/485 are isolated against all other instrument circuits.

Terminal B RS-485 bus 'B' signal

Terminal A RS-485 bus 'A' signal

Terminal G GND

graph TD
    subgraph Opt.1
        A["Block 1"] --> B["B A G"]
        C["Block 2"] --> D["Block 3"]
        E["Block 4"] --> F["Block 5"]
    end
    subgraph Opt.2
        G["Block 1"] --> H["B A G"]
        I["Block 2"] --> J["Block 3"]
        K["Block 4"] --> L["Block 5"]
    end
    subgraph Signal
        M["Block 1"] --> N["Block 2"]
        O["Block 3"] --> P["Block 4"]
        Q["Block 5"] --> R["Block 6"]
    end
    subgraph Power
        S["Block 1"] --> T["Block 2"]
        U["Block 3"] --> V["Block 4"]
        W["Block 5"] --> X["Block 6"]
    end

Rear view

4.1 Accessible registers

Display values (DISPLAY1, MAXMEM, MINMEM, AL1, AL2, AL3) are codified with a minimum of 6 digits (left zeros are added if necessary), polarity and decimal point.

Register	Name	Description
0	DISPLAY1	Display1 value
1	MAXMEM	Memory of maximum
2	MINMEM	Memory of minimum
3	AL1	Setpoint 1 value
4	AL2	Setpoint 2 value
5	AL3	Setpoint 3 value
6	STATUS	Alarm status
Table 3 - Accessible registers for ASCII protocol.

Register 0 - DISPLAY1

Contains the display value of the instrument, in ASCII code, including polarity (positive / negative) and decimal point.

Example 1 RO=+'0'6'5'4'3'2'

Display value = 6543.2

Example 2 RO='-'0'0'0'0'4'.'5'2'

Display value = -4.52

Register 1 - MAXMEM

Contains the value for memory of maximum, in ASCII code, including polarity (positive / negative) and decimal point.

Register 2 - MINMEM

Contains the value for memory of minimum, in ASCII code, including polarity (positive / negative) and decimal point.

Register 3 - AL1

Contains the value for alarm 1 setpoint, in ASCII code, including polarity (positive / negative) and decimal point.

Register 4 - AL2

Contains the value for alarm 2 setpoint, in ASCII code, including polarity (positive / negative) and decimal point.

Register 5 - AL3

Contains the value for alarm 3 setpoint, in ASCII code, including polarity (positive / negative) and decimal point.

Register 6 - STATUS

Contains the alarm status (on/off).

Bit 0 Alarm 1 status (0 = inactive, 1 = active)

Bit 1 Alarm 2 status (0 = inactive, 1 = active)

Bit 2 Alarm 3 status (0 = inactive, 1 = active)

Bit 3 to 15 Reserved

4.2 Configuration menu

graph TD
    A["PCI"] --> B["Configuration ASCII"]
    B --> C["Node Mode"]
    C --> D["Addr Address"]
    D --> E["6Aud Speed (kbps)"]
    E --> F["6bits Format"]
    F --> G["cnF.0 Configuration 'Master'"]
    G --> H["Tool Tools"]
    H --> I["dp Decimal point"]
    I --> J["LEG Legacy mode"]
    J --> K["AnS.d Answer delay"]
    K --> L["FACT Factory configuration"]
    L --> M["UE Version"]

    N["Slave' mode"] --> O["'Master' mode"]
    O --> P["8 bits, no parity, 1 stop"]
    O --> Q["8 bits, even parity, 1 stop"]
    O --> R["8 bits, odd parity, 1 stop"]
    O --> S["8 bits, no parity, 2 stop"]

    T["Fre9 Frequency"] --> U["0.1"]
    U --> V["60"]

    W["Automatic"] --> X["Manual"]
    X --> Y["0.1 seconds\n0.5 seconds\n1 seconds\n5 seconds\n15 seconds\n60 seconds"]

    Z["Auto"] --> AA["on/loFF"]
    AA --> AB["0.8.8.8.8\nuse key 'LE' to select"]
    AC["dP"] --> AD["Answer delay"]
    AD --> AE["0.88.8.88"]
    AF["Factory"] --> AG["no"]
    AG --> AH["YES"]
    AI["HHH"] --> AJ["HHHH"]

At menu 'Configuration ASCII' ('AScl'), configure the instrument at parameter 'Mode' ('ModE') to work as 'slave' or 'master', at parameter 'Address' ('Addr') set the address value from '1' to '31', set the bus speed in kbps at parameter 'Speed' ('bAud') and set the data format at parameter 'Format' ('bltS').

When working as 'master', the instrument continuously transmits the display value data frame. The local module address is '0'. Configure at menu 'Configuration Master' ('cnF.M') the 'Destination address' ('d.Add') parameter from '1' to '31' or use value '128' for a broadcast message. At parameter 'Frequency' ('FrEq') select the how often the frame with the reading value will be transmitted.

Special tools are grouped inside the 'Tools' ('TooL') menu.

• the 'Decimal point' ('dP') menu is provided for compatibility with ancient hardware that does not support decimal point retransmission. By default, select 'Automatic' ('Auto'). If your instrument does nos transmit the decimal point position, select 'Manual' ('MAnL') and fix the position of the decimal point manually.
• the 'Legacy mode' ('LEG') parameter is provided to maintain compatibility with instruments with older communication protocols. Select 'on' to activate this mode.
• the 'Answer delay' ('AnS.d') parameter applies only to 'Slave' mode. The local module delays the answer frame. Configure for applications where the 'Master' needs additional time to switch between 'transmit' and 'receive' modes. Enter a numeric value between '0' and '1000' mSeconds.
• at the 'Factory reset' ('FAct') menu, select 'yes' to load the default factory configuration for the instrument.

the 'Version' ('VEr') menu informs of the current firmware version installed in the module.

4.3 Frame types

The ASCII protocol defines the following frames:

• Frame 'read' ('RD'). Id code 36. Request data frame. The requested register is indicated into the 'REG' byte ('Header' section).

• Frame 'answer' ('ANS'). Id code 37. Response frame to a request data frame. The requested register is indicated into the 'REG' byte ('Header' section). Data of the requested register is indicated into data bytes 'DO' to 'Dn' ('Data' section).

• Frame 'error' ('ERR'). Id code 38. Response frame to a request data frame. Indicates that an error has occurred. Error code is codified into the 'REG' byte ('Header' section).

• Frame 'ping' ('PING'). Id code 32. Used to confirm the existence of the remote instrument.
• Frame 'pong' ('PONG'). Id code 33. Response to a 'ping' frame. It confirms the existence of the remote instrument.

4.4 Frame structure

Header Data Trail
STX	ID	RSV	FROM	TO	REG	RSV	LONG	D0	D1	...	Dn	CRC	ETX
2	x	32	x	x	x	32	n+1	[data]				x	3
0	1	2	3	4	5	6	7	8	9	...	n+7	n+8	n+9

Protocol frames have a structure made of 'Header', 'Data' and 'Trail'.

Section 'Header'

Contains the start byte ('STX'), the frame identifier ('ID'), the origin address ('FROM') and the destination address ('TO'), the register id ('REG') and the length ('LONG') of the 'Data' section.

Section 'Data'

Contains data for the requested register ('REG').

Section 'Trail'

Contains the 'CRC' code and the end of frame byte ('ETX').

'Real value' and 'Frame value'

To use representable ASCII values, the real values are codified before being sent into the frame. The following definitions apply :

• 'real value' is the value of the field without codification
• 'frame value' is the value of the field, codified

Field	Description	Size	Position	Real value	Frame value
STX	Start of frame	1 byte	0	does not apply	2
ID	Frame type	1 byte	1	(see section 4.3)	real_value
RSV	Reserved	1 byte	2	0	32
FROM	Origin address	1 byte	3	0 ('Master') / 1 to 31 ('Slave')	32 + real_value
TO	Destination address	1 byte	4	0 ('Master') / 1 to 31 ('Slave')128 ('broadcast')	32 + real_value
REG	Register identification	1 byte	5	(see section 4.1)	32 + real_value
RSV	Reserved	1 byte	6	0	32
LONG	Length of 'Data' section	1 byte	7	n (between 0 and 32)	32 + real_value
DO ... Dn	Data	n bytes	8 to n+7	number 0 to 9decimal pointpolarity (+/-)	ASCII code of the number (48 to 57)ASCII code of decimal point (46)ASCII code of '+' (43)ASCII code of '-' (45)
CRC	CRC calculation	1 byte	n+8	does not apply	(see section 4.6)
ETX	End of frame	1 byte	n+9	does not apply	3

Table 4 - Description of the bytes for the ASCII frame

4.5 Error codes

Frames 'ERR' contain within the 'REG' field, the error code. Available error codes are :

error 1 unknown register

error 2 display overrange

error 3 display underrange

error 4 CRC error

error 5 internal error

4.7 Frame examples

4.7.1 Frames 'RD' (36) and 'ANS' (37)

Example - 'Master' (address '0') requests the value of register '0' (display value) to the 'Slave' at address '28' ('RD' frame) and the 'Slave' replies to the 'Master' with a reply frame ('ANS' frame) containing the requested data (765.43).

*Instruments with 4 digits also send reading values formatted with 6 digits : value -321.5 is transmitted as -00321.5

Header								Trail
STX	ID	RSV	FROM	TO	REG	RSV	LONG	CRC	ETX
2	36	32	32	60	32	32	32	58	3
Start	RD	---	0	28	0	---	0	CRC	Stop

Header								Data								Trail
STX	ID	RSV	FROM	TO	REG	RSV	LONG	D0	D1	D2	D3	D4	D5	D6	D7	CRC	ETX
2	37	32	60	32	32	32	40	43	48	55	54	53	46	52	51	15	3
Start	ANS	---	28	0	0	---	8	+0765.43								CRC	Stop

4.7.2 Frames 'ERR' (38)

Example - 'Slave' at address '11' replies to the 'Master' (address '0') with an error frame ('ERR' frame) indicating that the requested register number is unknown ('UNKNOWN_REGISTER', error code '1'). The

error code is codified into the 'REG' byte. For a list of error code see section 4.5.

Header								Trail
STX	ID	RSV	FROM	TO	REG	RSV	LONG	CRC	ETX
2	38	32	43	32	33	32	32	46	3
Start	ERR	---	11	0	1	---	0	CRC	Stop

4.7.3 Frames 'PING' (32) and 'PONG' (33)

Example - 'Master' (address '0') requests confirmation of existence to the 'Slave' at address '22' ('PING' frame) and the 'Slave' replies to the 'Master' with a 'PONG' frame.

Header Trail
STX	ID	RSV	FROM	TO	REG	RSV	LONG	CRC	ETX
2	32	32	32	54	32	32	32	52	3
Start	Ping	---	0	22	0	---	0	CRC	Stop

Header Trail
STX	ID	RSV	FROM	TO	REG	RSV	LONG	CRC	ETX
2	33	32	54	32	32	32	32	53	3
Start	Pong	---	22	0	0	---	0	CRC	Stop

4.6 CRC calculation

The 'frame value' for the CRC byte is calculated applying a XOR function to the 'frame value' (see section 4.4) of all bytes in sections 'Header' and 'Data', from byte '0' ('STX') to the last data byte ('Dn').

- if the calculated CRC value is lower than '32', it is normalized by applying the 'one's complement' function.

CRC0=STX ^ ID ^ RSV ^ FROM ^ TO ^ REG ^ RSV ^ LONG ^ DO ^...^ Dn

• if (CRC0<32) -> CRC=!CRC0 (one's complement function)
• if (CRC0>31) -> CRC=CRC0

//example of CRC calculation in C language

int8 Calculate_CRC(int8 CRC_Position)

{

int8 i, CRC=0;

for(i=0;c<CRC_Position;c++)

1

crc=crc ^ frame[i];

}

if(crc<32) CRC=\~CRC;

return(CRC);

}

5. Option PCE-DPD/232

Module PCE-DPD/232 provides 1 RS-232 ASCII communications port. Protocol specifications are the same as with module PCE-DPD/485 (see section 4), with only difference that the physical bus is RS-232 instead of RS-485.

PCE-DPD/232 modules allow for point-to-point communication over RS-232 and also allow for multinode communication over RS-232 using a 'Daisy-Chain' type of connection.

Terminals RX1 and TX1 are for connection to the RS-232 bus. Terminals RX2 and TX2 are for RS-232 multinode connection. Frames received on RX1 with destination address different than the local instrument's address, will be retransmitted over the TX2 terminal. In a similar way, frames received from RX2 with destination address

Option PCE-DPD/232

Output type RS-232 ASCII communication port

Bus RS-232

Speed 57.6 Kbps to 600 bps

Data format 8n1 (standard), 8o1, 8n2, 8e1

Protocol

ASCII

Architecture 'master-slave'

Addresses 01 to 31

'Broadcast' address 128

Registers* see section 4.1

*available registers can vary for different models

Isolation 1000 Vdc

Configuration 3 button front keypad

Temperature operation from 0 to 50 °C

storage from -20 to +70 °C

Installation allowed at 'Opt.1', 'Opt.2', 'Opt.3'

Terminal E

GND

Terminal B

Rx2

Terminal D

Rx1

Terminal A

Tx2

Terminal C

Tx1

Opt.1 Opt.2 A B C D E A B C D E A B C D E Signal Power Rear view

Notes

PCE Instruments

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Pehlivan Sok. No.6/C

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Italia

PCE (Beijing) Technology Co., Limited

1519 Room, 4 Building

Men Tou Gou Xin Cheng

Men Tou Gou District

102300 Beijing

China

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