37-Pin Female D-SUB to 37-Pin Female Screw Terminal, Vertical DIN Rail Terminal Block—The CB-37FH is an unshielded connector block that provides access to NI data acquisition devices with 37-pin D-SUB connectors. The CB-37FH is a vertical connector block that mounts perpendicular to the DIN rail. It features screw terminals for connecting to 37 I/O signals, 12 to 30 AWG.