
3-33
FMT 3000 Hardware Reference Guide - Option Installation and Operation
Figure 3-29. Installing the RS-485 Option Board
The RS-485 option board converts RS-232 level serial communication signals to half duplex
bidirectional isolated RS-422/485. Sockets are provided on the board for custom installation
of termination and line bias resistors. A simplified schematic of the board and the locations
of the termination and line bias resistors is shown in
3-34.
RS-485 Board
Remove speaker screws and
mount RS-485 board over
speaker using supplied screws
and standoffs. Plug in option
connector cable.
B 1
A 2
GND 3