OPTO 22 SNAP PAC Redundancy Option, User Manual

Page: 13 / 68

CHAPTER 2: CONNECTING THE HARDWARE
SNAP PAC Redundancy Option User’s Guide
9
9
Connecting the PAC S-series Controllers
As shown here, two SNAP PAC S-series controllers connect to the arbiter using RS-485 serial ports.
They connect to each other on ENET 2 with an Ethernet crossover cable. See directions below for
either PAC S2s or PAC S1s. See also the diagram on
page 2 .
CTR1
CTR2
Serial 2
SNAP-PAC-S2 #1
SNAP-PAC-S2 #2
Serial 2
To network
Crossover cable
ENET 2
ENET 1
Ethernet connections Serial connections
This section includes the following topics:
• “Connecting SNAP-PAC-S2 Controllers” on page 10
• “Connecting SNAP-PAC-S1 Controllers” on page 11
• “Wiring the 7-pin Serial Connector on SNAP-PAC-S2 Controllers” on page 13
• “Wiring the 10-pin Serial Connector on SNAP-PAC-S1 Controllers” on page 13
• “Wiring the 6-pin Serial Connector on the Arbiter” on page 14
For pinouts of SNAP PAC S-series controllers, see form 1592, the SNAP PAC S-Series User’s Guide .