79 XFC G4 2103335 Rev AB
4.13.3 Board Configuration
Table 2–2 is a brief description of each configurable point on the flow computer main electronic board and its function. The
board diagram shows the location of these items (see Figure 62).
4.13.4 Other Field Wiring
For other wiring connections directly on the flow computer main electronic board, use Table 8 and Figure 62.
Table 8 XFC
G4
On-Board Jumper Settings
RS-485 Termination: When multiple flow computers are daisy-chained together on a
single RS-485 bus, the bus must be properly terminated. When the flow computer is the last
or only unit on the bus, the jumper should be across pins 1 & 2. If the unit is first or
intermediate the jumper should be across pins 2 & 3.
Lithium Battery Backup: J13 enables and disables memory backup via the lithium cell. A
jumper across pins 1 & 2 enables RAM memory backup. If the jumper is removed (or across
pins 2 & 3) the lithium cell is NOT enabled for memory backup. Should power be lost or
disconnected while the lithium cell is NOT enabled, the flow computer main processor board
will execute a Cold Boot and all historical data WILL be lost.
Security Switch: If the security switch is ON and a local connection is made to the unit via
PCCU, the proper security code must be entered. If the proper security code is not setup in
PCCU the operator will be unable to configure the flow computer. If the security switch is
turned , OFF the user will be able to configure the flow computer without secure access.
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