Wireless Modbus-to-Modbus bridge

• Carefully open WM-1 module and configure serial communication with jumpers. (Default configuration is 9600bps, 8N1 with normal timeout)
• Place WM-1 module at least 10cm from other objects. Installation is not recommended inside metal cabinets.
• Connect RS485 terminals to WM-1 RS485 terminals
  • A - A
  • B - B
  • C - GND
• Connect to 230V power supply
• Bind modules to wireless network

• replacement for RS485 wiring
• Modbus RTU serial protocol
• wired/wireless combinations
• very long range, no hopping
• protected private connection
• multiple slaves per device
• multiple addressable groups

• Available baudrates 2400, 9600, 19200, 38400 bps
• Data bits and parity 8N1, 7E1, 8E1, 8N2
• Max 64 bytes per transmition
• Integrated 240 Ohm termination resistor

* turn on all devices at the same time
* within 10 seconds, while RF LED is blinking, press and hold button on one of the devices
* after a second, the new address is randomly generated and sent to all devices. RF LED will blink 3 times to confirm the new address.

* turn on the device
* within 10 seconds, press and hold button on one of the existing devices
* after a second, the existing group address is sent to the new device. RF LED will blink 3 times to confirm the address is sent.

* Modbus master, connected to 12 slaves using a pair of WM-1 devices
* Modbus master, connected to 10 slaves, organized in two groups
* Modbus master, connected to 5 slaves, each one having local WM-1 device

* When the system has two or more separate Modbus lines, they should be configured as separate groups. 
* Each group has a single master and one or more slaves.
* Groups can't talk to each other, but they share the same bandwidth. 
* Two masters may start transmitting at the same time causing collisions. 
* To reduce number of missed messages, keep the traffic low.

• Press button shortly
• RF LED will blink shortly on each connected device
• Serial interface is unaffected

• Hold button and turn the device ON
• RF led will blink twice. Group address is now reset to default.
• Other devices will not be affected.