This relay module board's working voltage is DC 12V and standby current is11mA.Under the MODBUS command mode, this relay module can support up to 64 devices in parallel.
MODBUS commands can be made serial HyperTerminal (serial assistant) or "Modbus Poll" enter,and MODBUS RTU command control mode, the maximum delay is 255 seconds.
MODBUS command mode (HEX), you can control a variety of ways: Serial Hyper Terminal Control (need to manually add the CRC), Modbus Poll software control (software automatically add the CRC), PLC or MCU process control.
This relay module has 6 commands: "Open", "close", "Momentary", "Self-locking", "Interlock" and "Delay".
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