Simplex 4100ES Installation Manual page 163

22.2 EPS CPU Bay Overview
22.2.1 The Power Distribution Interface
In the CPU bay and the expansion bays, power and data are distributed via the PDI. The PDI is a wiring board with eight card slots, each of
which can accommodate a 4 x 5 card. If legacy motherboards are used, they must be mounted above the PDI using metal standoffs.
Note: Power source jumpers P4 and P5 must be placed in position 2-3 (to the right) for proper operation of an EPS CPU bay.
22.2.2 RUI+ Master Motherboard
The 4100 Master motherboard has two slots, one is dedicated for the system CPU and the other slot is typically used for 4120 Network,
ES Net network or RS232 cards. The first RUI channel in the system is the master motherboard. The RUI+ feature on this card provides
electrically-isolated power for the RUI channel, giving it greater immunity to crosstalk from other channels.
The card is installed on the PDI, occupying the space next to the power supply.
Note: If the RUI+ Master Motherboard is used to connect to a 4602-9101 (SCU), 4602-9102 (RCU) or 4602-9150, 4602-7101 (SCU/RCU
Graphic Command Center) move the P5 and P6 jumpers to the RUI NON ISO position.
22.2.3 4100ES CPU Bay Placement Guidelines
Refer to the following guidelines before mounting a motherboard into a CPU bay.
• There are eight 2" (51 mm) slots on the CPU bay. Slots 1 and 2 are the only available slots for aftermarket boards.
• If there are more old style 4100 modules than a CPU bay can accommodate, they should be placed into the next expansion bay.
• For SPS Configuration only: CPU bays do not include a power distribution interface (PDI) board, so this bay is reserved for
motherboard/daughter card modules only.
page 161
Figure 90: The Power Distribution Interface (PDI)
Figure 91: RUI+ CPU Master Motherboard (566-938)
4100ES Fire Alarm System Installation Guide
574-848 Rev. BQ