85
Item Description
Communication Module Indicators" on page1 for more information.
5 RS485 Ports (two)
CAUTION: Do not remove or insert the serial communication
connection when the Serial Communication Module is powered
unless the area is known to be non-hazardous.
Table 5-11: RS485 Pin definition
Pin Type Description
T- Output RS485 terminal resister
T+ Output RS485 terminal resister
A Input/output RS485 A line (+)
B Input/output RS485 B line (-)
Typically, short T+ and T-, and a 120-ohm resistor is activated between
A and B to revent signal reflections potentially interfering with
communications.
Table 5-12: RS232 Pin definition
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