The card has two 6-pin connectors, the top row and bottom row.
Each row can be configured as either:
Note that when using any RS232 mode in combination with RS485 or RS422 (any duplex type), the RS232 must be on ports 3 and/or 4 (bottom row).
RS232 can never be in ports 1 or 2 (top row) when using alongside RS485 or RS422 (bottom row).
For more details on the configuration options, please see the MOD-COM4 CFLink documentation which is the same for the CARD-COM4.
2 x RS232 without flow control
1 x RS232 with flow control
1 x RS485 half-duplex
1 x RS485/422 full-duplex