The SC932 is a retired product that has a 9-pin CS I/O connector and a 25-pin male serial DTE connector. It also has jumpers inside to configure how the DTR and RTS lines operate in reference to the datalogger’s modem enable line.
The SC932A has a 9-pin CS I/O connector and a 9-pin male serial DTE connector. There are no jumpers to configure in the SC932A. The DTR line is driven always, and the RTS line follows the datalogger’s modem enable line.