10ACT01 - Compteur / Minuteur Daytronic - Free user manual and instructions

Product Type	Counter/Timer Card
Model	10ACT01
Brand	Daytronic
Modes of Operation	Frequency, Period, Counter (Totalizer), Timer
Input Types	Low-level (0–100 kHz), TTL-level (100–3200 kHz)
Frequency Range (Full Scale)	3.2 kHz to 3.2 mHz (low-level limited to 100 kHz; TTL up to 3200 kHz)
Frequency Resolution	0.1 Hz to 100 Hz (selectable via RNG command)
Period Range (Full Scale)	0.32767 ms to 32767 ms (depending on number of cycles averaged)
Count Increment	1, 10, or 100 (selectable via RNG command)
Maximum Count	3,276,700 (with increment 100)
Timer Range (Full Scale)	0.32767 sec to 327670 min
Timer Resolution	10 μs to 10 min (selectable via RNG command)
Input Amplifier Sensitivity	5 settings: 10 V–200 V, 3 V–60 V, 1 V–20 V, 300 mV–6 V, 100 mV–2 V
Connector	20-pin I/O connector (mates with Daytronic No. 60322)
Logic Inputs	Negative-true: Reset (Pin 5), Latch Enable (Pin 6), Input Enable (Pin B)
Power Supply	+5 VDC and -5 VDC excitation from DataPAC mainframe
Compatibility	Daytronic DataPAC system (plug-in card)
Slave Capability	Multiple cards can be synchronized via solder jumper and wire-wrap interconnection
Noise Suppression	Capacitive coupling pins (0.1 μF on Pin E, 10 μF on Pin F)
Command Interface	MNEMONIC commands (TYP, RNG, SEN, INC, COH, COU, COR, COC, EID, EIE)
Installation	Plug into DataPAC mainframe slot; refer to Appendix B

Frequently Asked Questions - 10ACT01 Daytronic

How do I set the mode of operation for the 10ACT01?

Use the TYP (TYPE) command followed by the channel number and a two-character hex code. For example, TYP x = C0 for Frequency Mode, C1 for Period, C2 for Counter, and C3 for Timer. Ensure the EEPROM Write Protect Switch is ON before entering the command.

What are the supported input signal types for the 10ACT01?

The 10ACT01 accepts low-level frequency signals (0–100 kHz) from sensors like turbine flowmeters or tachometer pickups, and TTL-level pulse/square-wave signals (100–3200 kHz). For low-level, connect to Pin 3 (+SIGNAL) and Pin C (-SIGNAL); for TTL, use Pin B with Pin 3 tied to COMMON.

How do I select the range and resolution?

Use the RNG (RANGE) command with a numeric value 'n' that depends on the mode. For example, in Frequency Mode (TYP C0), n=1 gives 3.2 kHz full-scale with 0.1 Hz resolution and 10 sec time base. Refer to Tables 3.A.1.3–3.A.1.6 in the manual for all mode-specific n values.

What is the maximum count in Counter Mode?

In Counter Mode (TYP C2), the maximum count depends on the selected count increment. With increment 1, full-scale count is 32,767; with increment 10, it is 327,670; with increment 100, it is 3,276,700. Select via RNG command with n=1, 2, or 3 respectively.

How can I hold or reset the displayed count/timer value?

Use MNEMONIC commands: COH x (Counter Hold) to inhibit updates; COR x to reset to zero; COU x to update (release hold); COC x to clear reset. Alternatively, apply logic signals: Logic 1 on Pin 6 holds, Logic 0 on Pin 5 resets. Note that these commands only affect the scanned display, not the internal accumulation.

Can I synchronize multiple 10ACT01 cards for simultaneous frequency measurements?

Yes, by designating one card as MASTER (default) and others as SLAVE. To slav a card, place a solder jumper on the 'S' pads on Side 2 of the board, and hardwire the I/O #1, #2, #3 pins across all 10ACT01 slots on the DataPAC motherboard. Contact Daytronic for the wire-wrap procedure.

How do I set the input sensitivity for different voltage levels?

Use the SEN (SENSITIVITY) command with a gain value 'g': 1 for 10–200 V, 2 for 3–60 V, 3 for 1–20 V, 4 for 300 mV–6 V, 5 for 100 mV–2 V. This adjusts the analog-input voltage range independent of the operation mode.

What is the purpose of the EXTERNAL INPUT DISABLE (EID) command?

The EID command disconnects all external signals and logic inputs from the I/O connector when the 10ACT01 is in Timer or Counter mode. This allows for strictly internal control via MNEMONIC commands. To reconnect, use EIE (EXTERNAL INPUT ENABLE). It is especially useful for timing processes without external interference.

How can I suppress noise on low-frequency inputs?

Connect either Pin E (0.1 μF) or Pin F (10 μF) to SIGNAL COMMON (Pin 2) to add capacitive coupling to ground. This suppresses stray pickup and stabilizes the reading. For zero-velocity sensors, Pin E is recommended.

What are the pin assignments for the 20-pin I/O connector?

Key pins: 1 = +EXCITATION (+5 VDC), A = -EXCITATION (-5 VDC), 2 = COMMON, B = Input Enable (low-level) or TTL input, 3 = +SIGNAL (low-level), C = -SIGNAL, 5 = RESET, 6 = LATCH ENABLE, E = 0.1 μF coupling, F = 10 μF coupling. Refer to Table 3.A.1.1 for full details.

USER MANUAL 10ACT01 Daytronic

By means of the TYPE (TYP) command, the Model 10ACT01 Counter/Timer Card can be made to function in any of the four modes of operation described below.

In all but the TIMER mode, the "events" being counted by the 10ACT01 are waveform pulses, AC or unipolar, delivered to the 10ACT01's rear I/O CONNECTOR by an external pulse transformer transducer with two-wire isolated windings (turbine flowmeter, tachometer pickup, etc.), by a transistor or logic-circuit driver, or by a similar signal source.

The Model 10ACC-4 Totalizer Card can accept up to four independent TTL pulse inputs, and functions only in the COUNTER (or TOTALIZER) mode. It is particularly useful in assembly-line applications that require the accurate counting of large numbers of parts.

1. FREQUENCY MODE

In this mode, the 10ACT01 counts events per unit time, and can thus be used for direct frequency or rpm measurement. As explained in Section b.2(b), below, the RANGE (RNG) command lets you select the desired full-scale frequency range (with corresponding resolution), plus the specific time base during which "events" (pulses) are to be counted.

2. PERIOD MODE

In this mode, the 10ACT01 calculates the average time period required for the occurrence of 1, 10, 60, 100, or 120 pulse "events" (cycles). Such measurements are particularly useful when dealing with relatively low flow or speed signals, where a conventional frequency-to-voltage conversion is impractical. The full-scale reading (along with corresponding resolution and minimum frequency input) is selectable via the RANGE (RNG) command, as explained in Section b.2(b), below.

3. COUNTER (TOTALIZER) MODE

In this mode, the 10ACT01 or 10ACC-4 counts all perceived "events" (pulses) by an increment of 1, 10, or 100 (with a respective full-scale count reading of 32767, 327670, or 3276700), selectable via the RANGE (RNG) command (see Sections b.2(b) and d.2(a), below).

Special MNEMONIC COMMANDS, described in Section c.2, below, allow the operator or computer to increment the counter at any time, to disconnect or reconnect the external input, to hold the existing displayed count, to instantly update ("release") the displayed count, to reset the counter to zero, and to clear the counter (to resume normal counting from zero).

You can also use specific logic inputs to the 10ACT01's or 10ACC-4's I/O CONNECTOR to initiate a "hold," "release," "resetting," or "clearing" of the counter. In addition, the 10ACT01 lets you disable and re-enable the external input via logic-signal command, when the card is in COUNTER mode.

4. TIMER MODE

In this mode, the Model 10ACT01 provides precision timing by counting pulses generated by its own internal clock. As explained in Section b.2(b), resolution is selectable via the RANGE (RNG) command from 10 microseconds to 10 minutes, with corresponding full-scale readings from 0.32767 second to 327670 minutes.

Special MNEMONIC COMMANDS, described in Section c.2, below, allow the operator or computer to disconnect or reconnect the external input, to hold the displayed time value, to update ("release") the displayed time value, to reset the timer to zero, and to clear the time (to resume normal timing operation from zero). You can also use logic inputs to the 10ACT01's I/O CONNECTOR to disable and re-enable the external input, or to initiate a "hold," "release," "resetting," or "clearing" of the timer.

1. 10ACT01 CONNECTIONS

a. GENERAL CONSIDERATIONS

The Model 10ACT01's 20-pin I/O CONNECTOR mates with Daytronic CONDITIONER CONNECTOR No. 60322 (shown in Fig. 1.E.1). Pin functions are given in Table 3.A.1.1. Cabling is shown in Fig. 3.A.1.2 for three different types of input:

1. a nonexcited low-level frequency or rpm signal (0 to 100 kHz);
2. a TTL-level pulse or square-wave signal (0 to 3200 kHz);
3. output from a zero-velocity speed sensor with excitation of nominal +5 V-DC.

For low-level and zero-velocity inputs, connections are shown for both FREQUENCY/PERIOD and COUNTER/TIMER operation of the 10ACT01.

Specifications for the input pulse signal are identical to those given for the Model 10A40 Frequency Input Conditioner Card. The analog-input voltage range may be set, independent of the "mode of operation," via the SENSITIVITY (SEN) command (see Section b.2(c)).

Note that the 10ACT01's Pin B may have either of two functions, depending on the nature of the input signal:

• When the input is low-level (0 to 100 kHz), Pin B serves as a negative-true enabling pin. That is, the +SIGNAL input, which should be connected to Pin 3, will be enabled only when Pin B is at a Logic 0 level. Therefore, Pin B must be tied to COMMON (Pin 2) in order for the 10ACT01 to operate.
  When the 10ACT01 is in COUNTER or TIMER mode, Pin B may serve as a controllable gate, to enable and disable the external input as desired. To be so used, however, it must also be tied to the LATCH ENABLE input (Pin 6). See Section c.3, below.
• When the input is TTL-level (100 to 3200 kHz), it should be received at Pin B. In this case, the +SIGNAL (Pin 3) should be tied to COMMON (Pin 2), and the -SIGNAL (Pin C) should be tied to the -5 V-DC EXCITATION (Pin A).

The 10ACT01's Pins 5 and 6 provide negative-true logic inputs for the remote control of COUNTER and TIMER operation (see Fig. 3.A.1.1). These logic commands may be "ORed" with corresponding MNEMONIC COMMANDS, as explained in Section c.2, below.

Fig. 3.A.1.1 Model 10ACT01 Logic Inputs for Counter/Timer Control

b. SUPPRESSION OF NOISE IN LOW-FREQUENCY INPUT

False triggering can sometimes occur, especially at the low-frequency input range, because of stray pickup of frequencies outside the common-mode range. Capacitive coupling of the frequency input to ground can in such cases serve to suppress unwanted signal noise.

If you find your frequency reading to be unacceptably unstable or "noisy," you should connect either Pin E or Pin F to SIGNAL COMMON (Pin 2). Pin E provides 0.1-microfarad capacitance; Pin F provides 10-microfarad capacitance. Note that connection of Pin E is recommended for zero-velocity sensors (see Fig. 3.A.1.2(d,e)).

C. PULL-UP RESISTOR

When used with an open-collector type sensor, the Model 10ACT01 requires a pull-up resistor (typically 10 kilohms) between the +SIGNAL and the +5 V-DC EXCITATION (Pin 1).

Fig. 3.A.1.2 Model 10ACT01 Cabling

3.A.1 Counter/Timer Functions

Table 3.A.1.1
Model 10ACT01 Pin Assignments

I/O CONNECTOR Pin No.	Line Function
1	+EXCITATION (+5 V-DC)
A	-EXCITATION (-5 V-DC)
2	COMMON
B	(1) INPUT ENABLE(2) TTL-LEVEL INPUT
3	+SIGNAL (LOW-LEVEL)
C	-SIGNAL
4,D	N/C
5	RESET
E	0.1-MICROFD COUPLING
6	LATCH ENABLE
F	10-MICROFD COUPLING
7-L	N/C

2. 10ACT01 CONFIGURATION

a. SETTING 10ACT01 MODE: TYP COMMAND

To select the desired mode of operation for the Model 10ACT01 that uses DATA CHANNEL No. x, turn ON the DataPAC's EEPROM Write Protect Switch and enter a TYPE (TYP) command of the general form

$$ \text { TYP } x = v [ \text { CR } ] ^ {*} $$

where "v" is the appropriate two-character (hexadecimal) TYPE code, as given in the following table:

Table 3.A.1.2

10ACT01 Mode of Operation	Channel Type Code
FREQUENCY MODE (EVENTS PER UNIT TIME)	C0
PERIOD MODE	C1
COUNTER (TOTALIZER) MODE	C2
TIMER MODE	C3

b. SETTING RANGE AND RESOLUTION: RNG COMMAND

NOTE

You will normally NOT have to "locate" the 10ACT01 DATA CHANNEL via the LOCATE (LCT) command, unless you are "reconfiguring" the channel or are installing the 10ACT01 card yourself—in which case see Appendix C.

3.A.1 Counter/Timer Functions

To select the desired combination of range and resolution for the Model 10ACT01 that uses DATA CHANNEL No. x, you should enter a RANGE (RNG) command of the general form

$$ \mathbf {R N G} \mathbf {x} = \mathbf {n} [ \mathbf {C R} ] ^ {*} $$

Allowable values for the number "n" will depend on the particular mode of operation selected for your 10ACT01 via the TYPE (TYP) command, above. Note that a default value for "n" exists for each of the four modes. The default range will be in effect until the first application of the RNG command.

1. FREQUENCY MODE (TYPE "C0")

When using your 10ACT01 for frequency or rpm measurement, you will select the appropriate full-scale frequency range, with corresponding resolution, and also the desired time base of the measurement. Enter in the above RNG command the "n" value for the range configuration you have selected.

Table 3.A.1.3.
10ACT01 Ranges for FREQUENCY MODE

Full-Scale Range	Resolution	Time Base	"n" Value
3.2 kHz	0.1 Hz	10 sec	1
32 kHz	1 Hz	1 sec	2^*
32 kHz	1 Hz	10 sec	4
320 kHz**	10 Hz	0.1 sec	3
320 kHz**	10 Hz	1 sec	5
320 kHz**	10 Hz	10 sec	7
3.2 mHz**	100 Hz	0.1 sec	6
3.2 mHz**	100 Hz	1 sec	8

* Default range.
** This range exceeds the 100-kHz capability of the 10ACT01's low-level frequency input. In such cases, the TTL INPUT (Pin B) should be used (see Section b.1 for details).

2. PERIOD MODE (TYPE "C1")

When using your 10ACT01 for period measurement, you will select the appropriate full-scale reading, with corresponding minimum frequency input and resolution, and also the number of input cycles over which an average period value is to be calculated. Enter in the RNG command the "n" value for the range configuration you have selected.

Table 3.A.1.4.
10ACT01 Ranges for PERIOD MODE

Full-Scale Reading (millisec)	No. of Cycles Averaged	Minimum Input Frequency	Resolution	"n" Value
32767	1	0.032 Hz	1 millisec	1
32767	10	0.032 Hz	1 millisec	2
32767	100	0.032 Hz	1 millisec	3
27305	120	0.037 Hz	1 millisec	4
5461	60	0.183 Hz	1 millisec	5
3276.7	1	0.32 Hz	100 microsec	6
3276.7	10	0.32 Hz	100 microsec	7
3276.7	100	0.32 Hz	100 microsec	8
2730.5	120	0.37 Hz	100 microsec	9
546.1	60	1.83 Hz	100 microsec	10
327.67	1	3.2 Hz	10 microsec	11*
327.67	10	3.2 Hz	10 microsec	12
327.67	100	3.2 Hz	10 microsec	13
273.05	120	3.7 Hz	10 microsec	14
54.61	60	18.3 Hz	10 microsec	15
32.767	1	32 Hz	1 microsec	16
32.767	10	32 Hz	1 microsec	17
32.767	100	32 Hz	1 microsec	18
27.305	120	37 Hz	1 microsec	19
5.461	60	183 Hz	1 microsec	20
3.2767	10	320 Hz	100 microsec	21
3.2767	100	320 Hz	100 microsec	22
2.7305	120	370 Hz	100 microsec	23
0.5461	60	1832 Hz	100 microsec	24
0.32767	100	3200 Hz	10 microsec	25

NOTE

When selecting a suitable range for period measurement, keep in mind that the update interval for the scanned period reading will be equal to

No. of Cycles Averaged

Frequency Input

For example, if you apply a command of

$$ \text { RNG } 4 8 = 1 7 [ \mathrm{CR} ] ^ {*} $$

for the 10ACT01 using Channel No. 48, and the applied frequency input is, say, 1 kHz, then your period measurement will be up- dated every hundredth of a second, since

$$ \frac {1 0}{1 0 0 0 \mathrm{Hz}} = 0. 0 1 \mathrm{sec} $$

3. COUNTER MODE (TYPE "C2")

When using your 10ACT01 as an "event" counter (or "totalizer"), you will select an appropriate full-scale count, with corresponding count increment. Enter in the RNG command the "n" value for the range configuration you have selected.

Table 3.A.1.5.
10ACT01 Ranges for COUNTER MODE

Full-Scale Count	Count Increment	"n" Value
32767	1	1*
327670	10	2
3276700	100	3

* Default range.

4. TIMER MODE (TYPE "C3")

When using your 10ACT01 as a timer, you will select an appropriate full-scale reading, with corresponding resolution. Enter in the RNG command the "n" value for the range configuration you have selected.

Table 3.A.1.6.
10ACT01 Ranges for TIMER MODE

Full-Scale Reading	Resolution	"n" Value
0.32767 sec	10 microsec	1
3.2767 sec	100 microsec	2
32.767 sec	1 millisec	3
327.67 sec	10 millisec	4
3276.7 sec	100 millisec	5
32767 sec	1 sec	6*
327670 sec	10 sec	7
3276700 sec	100 sec	8
32767 min	1 min	9
327670 min	10 min	10

* Default range.

C. SETTING 10ACT01 INPUT-AMPLIFIER SENSITIVITY: SEN COMMAND

You can set the input-amplifier sensitivity of the Model 10ACT01 that uses DATA CHANNEL No. x by applying the SENSITIVITY (SEN) command:

$$ \text { SEN } x = g [ \text { CR } ] ^ {*} $$

where the value of "g" ("gain") to be entered is independent of the mode of operation selected via the TYPE (TYP) command, above. It does, however, set the 10ACT01's analog-input voltage range, as shown in the following table:

Table 3.A.1.7.	10ACT01Input Levels	Sensitivity("g") Value
	10 V - 200 V	1
	3 V - 60 V	2
	1 V - 20 V	3
	300 mV - 6 V	4
	100 mV - 2 V	5

d. "SLAVING" OF MULTIPLE 10ACT01'S

NOTE: THIS PROCEDURE IS NECESSARY ONLY WHEN MULTIPLE 10ACT01'S ARE BEING USED FOR FREQUENCY MEASUREMENTS OF EQUAL TIME BASE.

When more than one 10ACT01 cards are installed in a single DataPAC, you can synchronize their 1.000000-mHz crystal frequency reference by designating one card as "MASTER" and the other(s) as "SLAVE(S)." Unless otherwise specified, all Model 10ACT01's are factory-set for "MASTER" operation. To set a 10ACT01 for "SLAVE" operation, you should

1. Make sure the EEPROM Switch is OFF, and then turn OFF DataPAC power.
2. Remove the 10ACT01 card to be "slaved" from its slot (see Appendix B).
3. Locate the programming jumper pads labelled "S" on "Side 2" of the 10ACT01 board (see Fig. 3.A.1.3).
4. Place a solder drop between the jumper pads.
5. Reinstall the card.
6. IMPORTANT: Before reactivating power, make sure that the DataPAC motherboard's wire-wrap "I/O #1" pin (No. 41) for each mainframe slot containing a Model 10ACT01 is hardwired to the "I/O #1" pin (No. 41) of every other slot containing a 10ACT01 card. All 10ACT01 "I/O #2" wire-wrap pins (No. 42) should likewise be interconnected, as should all 10ACT01 "I/O #3" wire-wrap pins (No. 43). CONTACT THE DAYTRONIC SERVICE DEPARTMENT FOR THE WIRE-WRAP PROCEDURE.

Fig. 3.a.1.3

Model 10ACT01 "Slave" Programming Jumpers

3.A.1 Counter/Timer Functions

1. INCREMENTING THE COUNT: INC COMMAND

By entering the INCREMENT (INC) command, you can cause a Model 10ACT01 in the COUNTER mode (only) to increase its count reading by one increment (1, 10, or 100, depending on the full-scale count selected via the RANGE (RNG) command—see Section b.2(b)).

Thus, to increase by one increment the count reading of the 10ACT01 that uses DATA CHANNEL No. x, simply command

$$ \mathrm{INC} \times [ \mathrm{CR} ] $$

For the application of the INC command to a DOWNLOAD PSEUDOCHANNEL, see Section 2.M.1.

2. COUNTER/TIMER CONTROL

The four following commands are applicable only when the Model 10ACT01 is functioning in the COUNTER or TIMER mode.

NOTE THAT EACH COMMAND AFFECTS ONLY THE SCANNED DATA READING (WHICH, IN MOST CASES, WILL BE A DISPLAYED VALUE). THE 10ACT01 WILL ALWAYS CONTINUE TO ACCUMULATE COUNTS, REGARDLESS OF THE "CONTROL" COMMAND PRESENTLY IN EFFECT, AND OF THE DISPLAYED READING THAT RESULTS FROM THE APPLICATION OF THAT COMMAND.

Note also that the effects of these commands can also be obtained by the application of appropriate logic inputs to the 10ACT01's rear I/O CONNECTOR—but again, only when the 10ACT01 is set for COUNTER or TIMER mode.

a. HOLDING THE COUNT/TIME VALUE: COH COMMAND

To inhibit updating of the scanned data reading of the 10ACT01 that uses DATA CHANNEL No. x, apply the COUNTER HOLD (COH) command:

COH x [CR]

Alternatively, a Logic 1 input at Pin 6 of the 10ACT01's rear I/O CONNECTOR will "hold" the existing scanned data reading. Such an input may be "ORed" with a COUNTER HOLD (COH) command (see also Section c.3, below).

b. UPDATING THE COUNT/TIME VALUE: COU COMMAND

To release the COUNTER HOLD (COH) command, thus instantly updating the scanned data reading of the 10ACT01 that uses DATA CHANNEL No. x, and resuming normal COUNTER or TIMER operation, apply the COUNTER UPDATE (COU) command:

COU x [CR]

Alternatively, a Logic 0 input at Pin 6 of the 10ACT01's rear I/O CONNECTOR will release an existing "hold" condition, instantly updating the display and resuming normal operation. Such an input may be effectively "ORed" with a COUNTER UPDATE (COU) command (see also Section c.3, below).

C. RESETTING THE COUNTER/TIMER: COR COMMAND

To set and hold at zero the scanned data reading of the 10ACT01 that uses DATA CHANNEL No. x, apply the COUNTER RESET (COR) command:

COR x [CR]

If the 10ACT01's data reading is currently being "held" at a nonzero value by a COUNTER HOLD (COH) command or by a Logic 1 at Pin 6, then the application of COUNTER RESET (COR) will not produce a reading of zero. For the resetting of the 10ACT01 to be reflected in the scanned data reading, the COUNTER UPDATE (COU) command must be in effect, and Pin 6 must be at a Logic 0 level.

Alternatively, a Logic 0 input at Pin 5 of the 10ACT01's rear I/O CONNECTOR will set and hold at zero the scanned data reading, if no COUNTER HOLD (COH) command is presently in effect, and if Pin 6 is at a Logic 0 level. Such an input may be "ORed" with a COUNTER RESET (COR) command (see also Section c.3, below).

d. CLEARING THE COUNTER/TIMER: COC COMMAND

To release the COUNTER RESET (COR) command, thereby resuming normal updating (from zero) of the scanned data reading of the 10ACT01 that uses DATA CHANNEL No. x, apply the COUNTER CLEAR (COC) command:

COC x [CR]

Alternatively, a Logic 1 input at Pin 5 of the 10ACT01's rear I/O CONNECTOR will cause the Counter/Timer to resume normal updating (from zero) of the scanned data reading. Such an input may be effectively "ORed" with a COUNTER CLEAR (COC) command (see also Section c.3, below).

3. DISABLING AND ENABLING EXTERNAL INPUT DURING TIMER OPERATION: EID AND EIE COMMANDS

As indicated above, control of the Model 10ACT01's COUNTER or TIMER operation can be accomplished in two ways:

a. by MNEMONIC COMMANDS (COH, COU, COR, and COC), or

b. by appropriate logic inputs to the 10ACT01's rear I/O CONNECTOR.

Both methods of control may be simultaneously in effect, in a "logic-OR" fashion.

In applications where the 10ACT01 functions in the TIMER mode with "ORed" timer control, it is sometimes useful to be able to disable the 10ACT01's external input (including any and all logic commands received at the I/O CONNECTOR), in order to establish strictly internal control of the timing process (via MNEMONIC COMMANDS). You can then re-enable the external input whenever you wish the card to respond as well to external logic-signal commands—as, for example, when you're timing the duration of a switched process state.

To disconnect from the 10ACT01 that uses DATA CHANNEL No. x any and all external signals and logic commands received at its rear I/O CONNECTOR, apply the EXTERNAL INPUT DISABLE (EID) command:

EID x [CR]

3.A.1 Counter/Timer Functions

To cancel the EID command, thus reconnecting all external signals and logic commands received at the I/O CONNECTOR of the 10ACT01 that uses Channel No. x, apply the EXTERNAL INPUT ENABLE (EIE) command:

EIE x [CR]

NOTE: Although the EID and EIE commands will be effective when the 10ACT01 is in either COUNTER or TIMER mode, they are, in general, only useful during 10ACT01 TIMER operation (obviously, disconnection of the external input would only disrupt normal FREQUENCY, PERIOD, or COUNTER operations). Upon application to the 10ACT01 of a TYPE (TYP) or RANGE (RNG) command (Section b.2), the EXTERNAL INPUT ENABLE (EIE) command is automatically in effect.

ALSO NOTE: When the 10ACT01 is in COUNTER or TIMER mode (only), an input of Logic 1 at Pin B of the I/O CONNECTOR will also serve to disable the external input. A Logic 0 at Pin B will then re-enable the external input.