3M Touch Systems Proprietary Information
10
3M Dynapro ET 3170 Terminal Service Guide
RS-485 communication
To make a cable for RS-485 communications, use the pin-out shown in Table C.
For maximum cable length, refer to the EIA RS-485 Specification Standard.
Table C: COM A RS-485 connector pin-out (half duplex)
Pin Signal Description In/Out
1GND
Shield Ground
1
---
9 TX/ RX + Balanced Transmit data +
Connect to pin 14
IN/ OUT
10 TX/ RX - Balanced Transmit data -
Connect to pin 15
IN/ OUT
14 TX/ RX+ Balanced Receive data +
Connect to pin 9
IN/ OUT
15 TX/ RX- Balanced Receive data -
Connect to pin 10
IN/ OUT
1
Connect only one end of the cable to shield ground.
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