Feature: 1. SETTABLE RELATIONSHIP: 12 optically isolated input ports(NPN active low), the input and output relationship can be set to associated(default) and not associated through commands 2. 64 DEVICES IN PARALLEL: In command mode, up to 64 devices can be connected in parallel with this RS485 relay switch module 3. NO, EVEN AND ODD CHECK: The check method can be no check, even check and odd check, flexible and versatile, more practical 4. 7 INSTRUCTIONS IN TOTAL: There are 7 instructions of on, off, instantaneous, self locking, interlocking, delay and 2 channel interlocking 5. DURABLE PCB: Good quality PCB materials have reliability and miniaturization, good maintenance and interchangeability Specification: Item Type: RS485 Relay Switch Module Model: ETD8A12 Material: PCB Product Features: RTU Command: Support 03 06 16 function code "Delay" Command: 255 seconds maximum delay The command can be entered through the serial port hyper terminal (serial port assistant) or "Poll" Default Baud Rate: 9600BPS Baud Rate Can Be Selected By Jumper: 2400 4800 9600 19200 38400 57600 115200BPS The Data Sending And Returning Time: Can be set, 1000ms maximum value. Package List: 1 x RS485 Relay Switch Module Note: Pay attention to standard operation wiring.