This router is a predecessor of CS-3 series. The router is equipped with one 232 port (25 pin), one configurable 232/422 port (9 pin), one 422 port (9 pin) and one diagnostics RS 232 port. All the tests were done on the RS-232 port. To connect to a 232 port you will need a standard RS-232 cable with gender-bender on the router side. To connect to the diagnostics port you will need a null-modem RS-232 cable. The baud rates are set on the controller board using DIP switches. The other parameters can be set from the diagnostics port. As mentioned, this is very old and slow protocol.