Startechcom ICUSB422 User Manual download pdf (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

1 2 3 4 5 6 7 8 9

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