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Check the listing for details. DC 12V 1 Channel DB9 Serial Port Time Delay Relay RS232 UART Multi-function. Condition: New. Listed at 15.11 USD. Two serial ports: RS232 DB9 port. Working current (DC 12V): standby 16MA,1 relay open 47MA. 1xDelay Relay. Maximum load: 10A/250VAC,10A/125VAC,10A /30VDC, 10A/ 28VDC,10A/ 12VDC. New DC 12V RS485 Modbus RTU Relay Module Support 03 06 16 Function Code.