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USE AND MAINTENANCE MANUAL
3.4.5
Serial output connection COM2 in RS485 configuration
Female 9 pin cup connector.
make the jumper between pin 6 and pin 8 to connect the termination resistance; this is performed on
the first and last device connected one to another
3.4.6
RS485 connections
ATTENTION
Maximum operating conditions foreseen by standard RS485:
Maximum transmission distance = 1200 m
Maximum voltage at ends = +/- 7V
For the connection towards external devices it is recommended to use a "twisted
pair" shielded cable making sure to connect the shield to the metal part of the shell of the
9 pin connector.
NC = Reserved not to connect
DATA +/- = Two-way communication
line
TERMIN = Termination resistance to
connect to pin 6
Ri = Internal termination resistance
on terminal
NOTE: The free pins are reserved for the
RS232 connection