Installing An Option Card - GE DigitalFlo XGM868i Service Manual

4.6 Installing an Option Card

The Model XGM868i flowmeter can accommodate up to two option cards. A data logging or RS485 card may be
installed in Slot 2 and a variety of I/O option cards are available for installation in Slot 1.
To install an option card, see Illustrations 9, 10 and 11 in Figure 8 on page 35 and complete the following steps:
1. Complete the steps in the Removing the Circuit Board Assembly section on page 24.
2. Remove the terminal board from the main board/power supply board subassembly by completing Steps 1-3 in
Replacing the User Program on page 28.
3. Remove the screw from the angle bracket on the main board, as shown in Illustration 11 in Figure 8 on page 35.
Note: Do not lose the nylon washer located between the small angle bracket on the terminal board and the main
board.
4. If necessary, remove any option card (and optional I/O heat sink) currently in use.
5. There is a 36 pin connector (P2) and a 30 pin connector (P1) on the rear of the interconnect board. The option cards
must be plugged into these connectors.
a. To install a data logging or RS485 option card into Slot 2, orient the option card so that its 36 pin connector is
positioned over connector P2 on the interconnect board. Then, firmly seat the card into its connector. When
properly installed, the side of the option card with the 36 pin connector must face the center of the interconnect
board, and the edge of the option card must not overhang the edge of the interconnect board.
b. To install an I/O option card with optional heat sink into Slot 1, orient the option card so that its 30 pin
connector is positioned over connector P1 on the interconnect board. Then, firmly seat the card into its
connector. When properly installed, the side of the option card with the 30 pin connector must face away from
the center of the interconnect board, and the edge of the option card must not overhang the edge of the
interconnect board. (However, the optional heat sink will extend beyond the edge.)
Note: To attach an optional heat sink to an I/O option card, see page 30.
When the XGM868i includes both an I/O board (Slot 1) and an option board (Slot 2), the two boards must be
attached to each other with the hardware shown in Illustration 10 in Figure 8 on page 35. Pre-attach the nylon
washer to the screw before inserting the boards into the assembly.
DigitalFlow™ XGM868i Service Manual
Chapter 4. Parts Replacement
29