Modbus serial link, L = 2,5m, 1 female SUB-D 9+1male SUB-D 25. range of product: Magelis XBT – accessory / separate part category: connection accessories – accessory / separate part type: connecting cable – accessory / separate part designation: Modbus serial link – accessory / separate part destination: XBT terminal – cable length: 2.5 m.