Automatic Recognition: The relay module supports AT command and 8-byte command modes. These commands can be automatically recognized without the need for manual switching. The module allows for a maximum delay of 9999 seconds under the AT command, providing flexibility in timing applications. Interface: The relay module features a convenient and practical RS232 DB9 female interface, making it easy to connect to other devices or systems. Working Modes: The relay module offers 8 different working modes, including open, close, jog, self-lock, interlock, delay, all open, and all close. These modes provide flexibility in controlling the relay channels based on specific requirements. Specifications: The relay board is designed with 16 channels and operates on a DC 12V power supply (voltage range of 9-13V). It has a low standby current of 18MA. The interface is a RS232 DB9 female interface, providing multiple connection options. The module has 8 working modes and supports two types of instructions. Multi-channel Control: This relay module is a 16-channel relay module, allowing for the control of multiple channels simultaneously. This feature makes it suitable for a wide range of applications.