37-Pin Female D-SUB to 37-Pin Female Connector, Horizontal DIN-Rail Terminal Block—The CB-37FH is an unshielded terminal block that provides access to NI data acquisition devices with 37-pin female D-SUB connectors. The CB-37FH mounts in line with the DIN rail, and it features screw or spring terminals for connecting to 37 I/O signals, 12 to 30 AWG.