3.4.2 Connection of COM2 in RS422 configuration
Key
NC = Reserved - do not connect
RX422 +/- = Data reception
TX422 +/- = Data transmission
TERMIN = Termination
resistance to be connected to
pin 6
Ri = Termination resistance
inside terminal
NOTE: the free pins are
reserved for RS232 connection
Figure 3.6 - Example of RS422 serial port connection (log0005.gif)
CAUTION
Operating limits stipulated by the standard RS422:
Maximum transmission distance = 1200 m
Maximum line voltage = +/- 7V
For connection to external devices, use a screened twisted
pair cable and connect the screen to the metal cap of the
9-pin connector.
D410
1-24
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