DB9 Male Adapter Plate Signal Module, RS232 Serial DB9 9-pin to 9 Position Screw Terminal Block. Connector, Screw Type. DB9 adapter terminals to facilitate the project, site commissioning equipment. The wire range of the 9 Positions Screw Terminal Block is 12-24AWG, Voltage 300V, Current 10A. All-copper DB9 Socket, anti-oxidation, contact better.