Honeywell 620 RS232 to RS485 converter

[fredm54]

I'm trying to help a friend of mine who has some Honeywell 620-15 PLCs. They use a 623-60 converter to interface between a laptop's serial port to the PLC's programming port (which I think is a DB-9 connector) This converter has 2 DB-9 male connectors, one to the laptop and one to the PLC.

They believe the 623-60 converter is bad and they cannot find a replacement anywhere (checked Ebay, PLC-Center, etc)

They faxed me a Honeywell Cable Pin Out document that says this is a RS232-RS485 converter but I don't know if the RS485 port pinout is standard. The document defines the RS232 side (1=DCD, 2=TxD, 3=RxD, 4=DTR, 5=S Gnd, 6=DSR, 7=RTS, 8=CTS 9=Blank. The document does not define any of the RS485 pins.

They recently bought and tried a "standard" RS232 to RS485 converter but it did not work. They have several of these Honeywell 620 processors and they tried communicating with different laptops so the problem is with the converter or cables.

Does anyone have any info on this stuff? I don't have one here and he's about 600 miles away so I cannot just drop by to look!

thanks for looking!

Fred

 

[jrwb4gbm]

I don't know anything about this unit but found this website with google:
http://www.applied-automation.com/products/honeywell/ipc620.shtml

Also found this old thread here:
http://www.plctalk.net/qanda/showthread.php?t=23444

 

[danw]

1) I can't vouch for its acuracy, just a note I found:

> The Honeywell 620 range supports several types of comms dependant on which model you have.
> The 620-12/14/16/26/36 procesors all have an on board RS422 comms port (25 pin D) software selectable for either Modbus or Honeywell ABC. Older models of CPU depend on add in cards for their comms. The 620-0042/48 DCMs give 'Honeywell ABC' on RS232/422, whilst the 620-0043 gives Modbus.

2) Don't know if it will help, but here's the tech tip "Using the 621-0012 ASCII module" with comm wiring diagram:

Tech_Tip_4901_Using-ASCII_on_621-0012.pdf

 

[fredm54]

Thanks for all that info! I will pass that information to my friend.

Fred :site:

 

[Powerboy]

Hi
I think i have one on my desk, if still needed. But it´s in Göteborg, Sweden....

 

[Magnus2011]

I tried using a standard RS232 to RS485 converter with an old
Honeywell 620 but were unable to figure out the pin configuration. I think you need the exact Honywell datasheet and a bit of luck to do this.