Db9 pin assignment – StarTech.com ICUSB422 User Manual
Page 6
Instruction Manual
3
• NOTE: In “422” mode, the ECHO setting is not used.
• The Echo mode is useful for detecting if there is data collision occurring on RS-
485. If the echoed data is not equal to the transmitted data, then data collision is
occurring.
DB9 Pin Assignment
DB9 Pin
RS-422
RS-485
1
TxD -
Data -
2
TxD +
Data +
3
RxD +
NC
4
RxD -
NC
5
GND
GND
6
NC
NC
7
NC
NC
8
NC
NC
9
NC
NC
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