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198-1600-00 Rev F
5.4. Digital I/O
The 8 pin connector on the remote control contains all of the digital inputs and outputs.
The digital input (operate control) is activated by a contact closure on the digital input + and
–
connections.
A series of digital outputs are available to provide status information for process control. Each
output is an open collector output. The output should be used to switch no more that 24VDC and
no more than 35mA. Polarity of the connections should be observed.
It is the customer’s
responsibility to ensure any circuit connected to the digital outputs meets the above criteria.
Failure to stay within the specified maximum ratings will result in damage to the digital outputs.
5.4.1. Digital Inputs
5.4.1.1.
Remote Operate Control Connections
The operate/standby state can be controlled by the remote operate input. Pins 7 and 8 of the
eight pin connector on the remote control are used for remote operate control. Shorting pins 7
and 8 together activates the operate input. The operate input is configurable; see
Operate/Standby Control (Digital Input)
for details.
5.4.2. Digital Outputs
5.4.2.1.
End Of Cycle Status Connections
Digital output pins 1(+) and 2(-) can be used to sense when the end of a timed cycle (ATC or
RTC) has been reached. The output will switch on to indicate the end of a cycle. If the power
supply contains more than one output channel the output is activated when any of the output
channels has reached the end of a cycle, there is not a separate output for each channel. For
remote sense of the end of cycle for individual output channels the serial host port interface
should be used.
1 - (+) End Of Cycle Output
2 - (-) End Of Cycle Output
3 – (+) Alarm Output
4 – (-) Alarm Output
5 – (+) Operate Status Output
6 – (-) Operate Status Output
7 – (+) Operate Control Input
8 – (-) Operate Control Input
+
-
Digital I/O Signals
Typical Output Circuit
Remote Control Connector
(alarm output shown)
Customer Circuit
Max Voltage: 24V
Max Current: 35mA
V+
V-
R= Current limiting resistor
Remote Control Connector
3
4
