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And there are two instruction control modes for MODBUS instruction (default) and AT instruction. And there are two instruction control modes for MODBUS instruction (default) and AT instruction. AT command can be input by serial port super terminal (serial port assistant). For MODBUS command can be input by "for Poll" in addition to serial port super terminal input. The maximum delay is 255 seconds for MODBUS command, and the maximum delay is 9999 seconds under the AT command. Supports six working modes including on, off, jog, self-lock, interlock and delay, the relay is easy to use. With ability to up to 64 equippment in parallel, such relay is for MODBUS command mode.