I posted this on the SMA forum but did not receive any replies, so I thought I would try here:

I am looking for the SB6000U pin descriptions for the two connectors that the RS232 & RS485 interface boards plug into. I would like to make my own interface & RS232 extender to my PC. Power for the interface will be provided from the PC side and optocouplers will be used to isolate the PC side from the SB6000U. I am an electrical engineer so I do have experience with these types of interfaces.

Any help on the pin outs would be appreciated. Are service manuals / schematics available? If I can't get the pinouts, then I will most likely have to buy the SMA interface card and reverse engineer it.

Bryan Zublin