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C.1 C
ONNECTION
Step
Procedures
1
Connect HPOD redundant loop connectors together using a CA/WR12190-1 redundant
loop cable
2
Connect a 28V WG switch to the switch connector on the redundant loop cable.
3
Since both units will be connected to a single RS-485 bus, they will need independent
serial COMM addresses. To simplify the setup:
a. Power up the unit connected to the "SSPA 2" end of the CA/WR11124-1 cable. Using
a RS-485 connection and a terminal program, set the serial COMM address to
"2"(SPA=0002)
b. Disconnect SSPA 2 from the RS-485 cable. Connect the RS-485 cable to and power
up the unit connected to the "SSPA 1" end of the redundant loop cable. Confirm this
unit's serial COMM address is "1". If required set it to "1" (SPA=0001).
c. When complete, the SSPA connected to the "SSPA 1" end of the redundancy
interlink cable should have RS-485 COMM address 1 and SSPA 2 will be COMM
address 2.
4
Connect both units to the RS-485 COMM cable and power both units on. Confirm correct
serial comm. by sending them both an RET? query and noting the response.
5
The units auto detect the presence of the redundant loop cable. Send RED? to both units.
Both should report RED=1 indicating proper detection of the redundant loop cable.
Appendix C. 1:1 HPOD Series
C–1
Redundancy Test
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