Where to find Modbus connector pinout?

T

Thread Starter

Tim Greif

I need to know where to look to find the pinout for a Modbus cable 9-pin D connector for the Modbus port on a Momentum or Quantum plc. I've searched the modicon site and got no answers. The only helpful info I found is that they recommend a Belden 8777 cable whic is a three pair cable. How many of those conductors are actually needed to successfully interface with the modbus port connector on the plc?

Thanks for the help.
 
<PRE>
IBM PLC
CD 1 *-1 SHLD
RX 2---------3 TX
TX 3---------2 RX
DTR 4--------6 DSR
GND 5--------5 GND
DSR 6--------4 DTR
RTS 7-| |-7 RTS
CTS 8-| |-8 CTS
9 NC

* Shield connection.
Jumper 7&8 on both
</PRE>
 
Hello Tim,

<P>Momentum Cable:
<P>Remember that the Momentum processor uses an RJ45 connector. </P>
<P>The cable pinout below is for the RJ45 to 9 Pin Female connector. The RJ45 cable between the connector and processor is a "straight through"
cable.</P>

<PRE>
-------------------------------------------------------------
PC End for Micro and Momentum controllers

RJ45 9 Pin
end Female End
---------------------------
6--|
2 ------------------ 4--|
3 ------------------ 2
4 ------------------ 3
5 ------------------ 5
6 -----|
7 -----| 7--|
8--|
</PRE>

<P>RJ45 Cable is a straight through cable.
Diagram below is looking at connector on cable.</P>
<PRE>
__________
| |
| |
| |
-- --
pin | | pin
1 - - 8
| |
----

____________________________________________________
Quantum and 984 Cable:

9 Pin to 9 Pin Modbus cable for Quantum and
984 processors with 9 pin Female Modbus ports

9 Pin 9 Pin
Male end Female End
Quantum PC
---------------------------
1 ------------------ 1
2 ------------------ 3
3 ------------------ 2
5 ------------------ 5
4 ---| 4--|
6 ---| 6--|

7 ---| 7--|
8 ---| 8--|

</PRE>

<P>Bradley G. Hite
<BR>Intertech Incorporated
<BR>mailto:[email protected]
<BR>http://www.myplc.com
<BR>Teaching Practical Skills for a Technological World</P>
 
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