5V RS485 RS232 (TTL) RTU Control Module UART Relay Switch Board PLC Support for Modbus

Feature: Support for: MODBUS and AT command, two command control modes The maximum delay is 9999 seconds under the AT command, and the maximum delay is 255 seconds for MODBUS command. The AT command can be input by the serial port super terminal (serial port assistant). Up to 247 devices can be supported for parallel use for MODBUS command mode. With RS485 and RS232 (TTL) bus interface. Output control pin 8, 5V TTL level, low level (default) / high level output. Specification: Working voltage: 5V Working current: 10-15mA Size: 45*30*15 Weight: 12g Package list: 1 * Module Note: The actual product color may deviate from the photo due to light. There may be a slight deviation in the measurement of product.