Figure 4: Installing the Motherboard into a 4100 Expansion Bay
4. If you are installing the leftmost motherboard, connect a 733-525 Power and Communication Harness. Continue to the next topic to connect the
harness.
Connecting the 733-525 Harness
If you need to connect a 733-525 Harness to a motherboard, refer to Figure 6 and follow these steps. Make sure to route the power and
communication wiring on the left side of the bay.
1. Connect one end of the harness to a motherboard in an adjacent bay. If the adjacent bay is a master controller bay, connect the harness to the
P2 and P3 connectors of the master controller motherboard and continue to step 2. If the adjacent bay is an expansion bay, connect the harness
to the P2 and P3 connectors of the motherboard installed in the leftmost slot. (If a 4100/4120-0155 SDACT, 4100-6052 Event Reporting DACT,
4100-6053 Point Reporting DACT, or a 4100/4120-0153 CCDACT occupies the leftmost slot, connect the harness to the motherboard in the
second slot from the left.) Connect the harness as follows:
a. Insert the harness connector with the blue wire into the P2 connector. Note that the P2 connector has eight pins. Insert the harness
connector on either the top four pins or the bottom four pins, not in the middle.
b. Insert the harness connector with the white wire into the P3 connector. Note that the P3 connector has eight pins. Insert the harness
connector on either the top four pins or the bottom four pins, not in the middle.
2. Connect the other end of the harness to the leftmost motherboard in the next bay, as described below. Make sure to route the wiring on the left
side of the bay.
a. Insert the harness connector with the blue wire into the P2 connector. Note that the P2 connector has eight pins. Insert the harness
connector on either the top four pins or the bottom four pins, not in the middle.
b. Insert the harness connector with the white wire into the P3 connector. Note that the P3 connector has eight pins. Insert the harness
connector on either the top four pins or the bottom four pins, not in the middle.
page 6 579-220 Rev. F
4100/4120- Series and 4010ES Relay Modules Installation Instructions