9
2.2 Wiring
(Cont’d)
Connector C (DB-25M)
This Connector provides Contact Outputs for the 4 on-board relays.
Pinout: Pin#
Pin Name
1
Relay 1 NC Contact
2 NO
CONNECTION
3
Relay 1 Com
4 NO
CONNECTION
5
Relay 1 NO Contact
6 NO
CONNECTION
7
Relay 2 NC Contact
8 NO
CONNECTION
9
Relay 2 Com
10 NO
CONNECTION
11
Relay 2 NO Contact
12 NO
CONNECTION
13 NO
CONNECTION
14 NO
CONNECTION
15
Relay 3 NC Contact
16 NO
CONNECTION
17
Relay 3 Com
18 NO
CONNECTION
19
Relay 3 NO Contact
20 NO
CONNECTION
21
Relay 4 NC Contact
22 NO
CONNECTION
23
Relay 4 Com
24 NO
CONNECTION
25
Relay 4 NO Contact
2.2 DIP Switch
(Rear of Unit)
Channels 1 – 8 have a 100 Ohm resistor available across their inputs for use with 4-20mA
inputs
ONLY
. Only move the appropriate DIP switch to the “ON” side if that channel is to be
configured as a 4-20mA input.
If any inputs besides channels # 1 – 8 are to be configured for 4 – 20 mA, a 100 ohm resistor
will need to be installed across the corresponding input channel terminations on the terminal
block.
NOTE: Setting the DIP switch to “ON” for either a 0-5V or thermocouple input will result in
faulty operation of the SC-2124.
