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220 / March 2000
I N P U T M O D U L E
Note that these are opto isolated outputs. START/STOP COM A
(pin 5) connects to the opto emitters, while the remaining connections
(START A, pin 3 and STOP A, pin 4) connects to the opto collectors.
Correct polarity must be observed in wiring to these connections.
To Control the Module’s OFF Switch LED with an External
Source Machine
READY — Hook up the remote machine’s “ready” control pins to
the IND-220 module’s DB-25 connector control pins: for READY A
wire to pins 1 and 2. The module’s Ready port is looking for a 5VDC
signal with pin 2 positive with respect to pin 1 (READY A). As long
as the voltage is present in the correct polarity, the OFF switch LED
will be illuminated.
Tally B
Provides a remote indication that the module’s B source has been
selected. This control function provides a continuous closure (open
collector) between Pin 6 (Tally B) and Digital Ground (Pins 4, 17 or 19)
whenever the B source is selected.
This closure can be used to control an externally powered tally light
that requires a continuous closure to function. An external tally light
(i.e., LED) can be powered from the input module by connecting the
external LED to +5V Digital (Pin 18) and the B Tally port. In either
case, current should not exceed 30 milliamps.
We recommend a series
resistor between the LED
and +5V digital when you
are powering the external
tally from the console; a
value of 220
Ω
(1/4W 5%)
is suggested.