3M Touch Systems Proprietary Information
12
3M Dynapro ET 3170 Terminal User’s Installation Guide
Connecting a serial device
The terminal has one asynchronous serial port that can be used to connect to your
host system. This port is 16550 UART-based and can transmit data at speeds up
to 19,200 baud.
Communication port
The communications port is a 25-pin, male D-connector that is capable of either
RS-232 or RS-422/485 communication. The factory default is
RS-232.
For instructions on configuring this port for RS-422 or RS-485 communications,
see Chapter 2 of the ET 3170 Terminal Service Guide (at the back of this book).
RS-232 communication
For RS-232 communication, use a conventional cable or make a cable using the
pin-out in Table A. The maximum cable length is 50 feet.
WARNING
To reduce the risks associated with electrical shock or fire which, if not avoided,
could result in death or serious injury and/or property damage:
! To ensure compliance with electrical codes and safe operation of the ET unit, have a
licensed journeyman electrician familiar with local codes perform all wiring tasks.
Table A: COM A RS-232 connector pin-out
Pin Signal Description In/Out
1CGND
Shield Ground
1
---
2 TXD Transmit Data OUT
3RXDReceive DataIN
4 RTS Request To Send OUT
5 CTS Clear To Send IN
6 DSR Data Set Ready IN
7 SGND Signal Ground ---
8 DCD Data Carrier Detect IN
20 DTR Data Terminal
Ready
OUT
22 RI Ring Indicator IN
1
Connect only one end of the cable to shield ground.
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