Table 3.3 Rs-485 Half Duplex Hook-Up - Omega i-SERIES User Manual

Table 3.3 shows RS-485 half-duplex hookup using a computer's RS-232 interface, an
RS-485 interface converter, and an i-Series controller.
Table 3.3 RS-485 Half-Duplex Hook-up
COMPUTER
PIN FUNCTION
Rx/Tx
Rx/Tx
Common ground
Communication Interfaces shown above are those which used on i-Series
devices. Other types of Communication Interfaces are not covered in this
chapter.
DB9 DB25
2 3 SEE CONVERTER'S
3 2 MANUFACTURING
5 7 SPECIFICATION
CONVERTER BOX
COMPUTER
SIDE
8
i-SERIES
FUNCTION/
i-Series LABEL
SIDE
-Rx/-Tx
+Rx/+Tx
COM
Tx
Rx
RTN