Inline coupler bus, Modbus / RTU, 9 Supports D-Sub, digital inputs: 8, 24 VDC, Connection Technology: 3 conductors Outputs: 4, 24 V DC 500 mA connection technology: 3 conductors Speed transmission on the local bus 500 kbit / s / 2 MBit / s Degree of protection IP20, including Inline connectors and identification fields. Model IL MOD BK DI8 DO4-PAC. Phoenix Contact.