The 6GT2191-1BH50 is a coiled plug-in cable that connects a SIMATIC MV320 optical handheld reader to the RF120C communication module. The D-Sub plug mates with the MV320 reader base; the RJ50 (10-pin modular) plug inserts into the RF120C. It carries RS232 data and 5V DC power over a black PUR jacket that is halogen-free.

Why a coiled cable instead of a straight one?

The coiled design solves a specific ergonomic problem: the MV320 is a handheld device that an operator picks up, aims at a barcode or RFID tag, and returns to its dock. A straight cable would drape across the workstation when the reader is docked, becoming a snag hazard. The coiled cable extends from roughly 1.6 meters at rest to about 4 meters at full stretch—enough to reach across a picking station or assembly cell—then retracts neatly when the operator puts the reader back. This is the only cable in the SIMATIC RF MV family with this coiled form factor; all other MV cables are straight.

Which communication module does this cable work with?

The 6GT2191-1BH50 is specifically pinned for the RF120C communication module. Siemens offers a parallel variant—6GT2191-0BH50—pinned for the RF166C, RF170C, and RF18xC/CI modules. The connectors look identical but the pinout differs. If your system uses an RF120C, this is the correct cable; if you are connecting to an RF1xxC series module other than the RF120C, use the -0BH50 variant instead. The part number suffix is the only reliable way to tell them apart.