R421A08 Modbus RTU RS485 Relay Module
R421A08 : https://485io.com/r421a08-8-ch-dc-12v-rs485-relay-module-modbus-rtu-485-remote-control-switch-for-plc-ptz-camera-p-560.html
R421A08 : https://485io.com/r421a08-8-ch-dc-12v-rs485-relay-module-modbus-rtu-485-remote-control-switch-for-plc-ptz-camera-p-560.html
