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 data logger’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 data logger’s modem enable line.