Figure 5-3. CPU
The FB107 supports up to four communication ports: LOI, COM1,
COM2, and COM3:
Local Operator Interface (RS-232C)
Located on the CPU and labeled LOI (see Figure 5-3), the LOI port
provides asynchronous serial communications, with DB9 connector.
Default LOI values: 19,200 baud rate, 8 data bits, no parity, and 1
stop bit.
Note: The LOI port located on the FB107 base unit (see Figure 1-1)
is factory-wired into the LOI port on the CPU. You can use
either LOI port, but not both.
EIA-485 (RS-485)
Located on the CPU and labeled 485 (see Figure 5-3), the COM1 port
provides asynchronous serial communications, and is the standard for
differential data transmission over distances of up to 1220 m (4000
ft). EIA-485 (RS-485) provides asynchronous serial communications
for multi-drop units on a serial network over long distances using
inexpensive twisted-pair cables.
Default EIA-485 (RS-485) values: 19,200 baud rate, 8 data bits, no
parity, and 1 stop bit.
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