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Pin

Direct

1

Input

2

Input

3

Output

4

Output

5

6

Input

7

Output

8

Input

9

Input

MODBUS Communications Driver

The IBM PC AT serial

AT Serial Port port is a DB9M (9-pin Male) connector. Here are its pinouts:

ion

Signal Carrier Detect Receive Data Transmit Data Data Terminal Ready

Ground Data Set Ready Request to Send Clear to Send Ring Indicator

Conductor

Signal

IBM PC Pin

IBM AT Pin

Device Pin

1

Ground

7

5

7

3

TD

2

3

3

4

RD

3

2

2

Unfortunately, not all MODBUS devices have standard serial ports. You may need to experiment in order to find the correct cabling setup. A “breakout box” or similar device can be very helpful while trying to set up a serial communications link.

The Cable

You can use the Driver with a three-wire (Transmit Data, Receive Data, and Ground) cable. ACS uses the following cable:

Page 4

June 6, 1998

Revision 2.210

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