Inline, bus coupler, Modbus / RTU, D-SUB-9 female connector, digital input: 8,24 V DC, connection system: 3-wire, digital output: 4,24 V DC, 500 mA, connection system: 3-wire, local bus transmission rate: 500 kBit / s / 2 MBit / s, protection class: IP20, including Inline connector and marking strip