Connection Of Com3 Serial Output; Rs422 Connection - ob DD2050 Use And Maintenance Manual

3.6 CONNECTION OF COM3 SERIAL OUTPUT

The standard instrument features a third serial output (COM3). For
information about RS232 connection, refer to § 3.5. Pin coding is the same.

3.6.1 RS422 CONNECTION

Example of RS422 serial port connection
Figura 3.6 –
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.
1-28
Key:
NC = Reserved - do not
connect
RX422 +/- = Received data
TX422 +/- = Transmitted data
TERMIN = Termination resistor
to be connected to pin 6
Ri = Termination resistor inside
terminal
NOTE: the free pins are
reserved for RS232 connection
DD2050