4 PCS mini DC 12V RS485 Delay Relay Module Modbus-Rtu Uart Switch Board

Producta Name: 4 PCS mini DC 12V RS485 Relay Module Modbus Rtu Switch Board for CCTV Camera PTZ LED Security PLCPackage inlcuded:4 xDC 12V 1Ch RS485 Modbus & AT commandRelay BoardDescription:1: DC 12V power supply2: Standby current (all relays closed) 7-8MA, 1 relay open 40MA3: ''open'' ''close'' ''Momentary'' ''Self-locking'' ''Interlock'' ''Delay'' 6 Commands4: Two instruction-control mode : AT command and MODBUS command5: Under the AT command ,the maximum delay is 9999 seconds Under the MODBUS command ,the maximum delay is 255 seconds6 AT commands can be made serial HyperTerminal (serial assistant) Enter; MODBUS commands can be made serial HyperTerminal (serial assistant) OR ''Modbus Poll'' Enter;7 Under the MODBUS command mode, it can support up to 247devices in parallel8 Size: 40* 30* 18mm ;9 Weight: 17.5 g;10 Maximum load: 20A 14VDC;20A/125VAC;10A/250VACInstruction manual Please ask us after the purchaseApplication
Automated industry PLC
Smart Home,Home Automation ,Wiser Home;
Identification system;
Motor FW & BW
CCTV Camera PTZ Control
Security system
LED dot matrix screen
Typical applications:1 AT command mode (M0 Connect), in this mode can be through the serial HyperTerminal (serial assistant) enter a simple AT command control relay. AT command mode time up to 9999 seconds

2 MODBUS command mode (M0 disconnect), 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

Wiring Diagram:

1 DC 12V control circuit,Wiring diagram below. ''LOAD'' may be camera,LED lights, fans, motors and other DC 12V equipment

2 DC 12V motor reversing control, Wiring diagram below. ''LOAD'' can be Fans,motors, pumps and other DC 12V equipment

Test Software(We offer a demo video):
Serial HyperTerminal:
Modbus Poll