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JJSEEKER
Commentator

Join Date: Feb 2007
Location: East Coast
Posts: 62

DB9 to RJ11 Converter

11/09/2008 1:58 AM

Hi guys,

I need to make a db9 (female) to rj11 adapter for the programming of a Keyence KV series PLC.

The plc interfaces with the rj11, db9 with a usb to db9 (male) converter.

I am not sure how to connect the rj 11 wires to the db9.

Preliminary research tells me Black goes to pin 3(recieve data), Yellow goes to pin 2(transmit data), red and green go to pin 5(clear to send).

I have seen some conflicting info on this so I decided to check with the pro's.... Thanks in advance for your time.

JJ
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indel
Guru
Engineering Fields - Electrical Engineering - New Member

Join Date: Oct 2007
Location: Sour Lake, TX 30°08'59.68"N 94°19'42.81"W
Posts: 675
Good Answers: 13
#1

Re: db9 to rj11 converter

11/09/2008 7:15 AM

RJ11 has two wires dedicated for one phone line. The other two are for the second line. As I remember, first line has red and green (but I could be wrong). Your PLC has a serial communication, on two wires. I don't know your PLC type, I am using Koyo (Automation Direct). In the PLC manual they show the pinout for the connection. You might be lucky to find the cable with the two connectors over the ebay (I found one for Koyo, for $6) I googled db9 to rj11 plc and I found this: http://www.lammertbies.nl/comm/cable/unitronics-rj11.html. but I am afraid they confuse RJ45 for RJ11.

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Tony Aston
Power-User

Join Date: Jun 2007
Location: Oxford, UK
Posts: 145
Good Answers: 3
#2

Re: DB9 to RJ11 Converter

11/10/2008 9:23 AM

Forget the wiring of the RJ11 as a telephone connector. Contact Keyence to get the pin configuration of their RJ11 connector.

I have some laboratory equipment that uses RJ11 connectors; in some cases a 6 pole 4 pin connector can be used as well as an 8 pole 6 pin connector. Normally you would count 1 to 6 or 1 to 4 but according to the original circuit diagram, the counting will be 1 to 6 or 2 to 5.

Be careful and do not assume!

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