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--- wiki:20_rdc_charger:15_hardware:22_wm-1 [2023/03/31 10:07] – removed - external edit (Unknown date) 127.0.0.1
+++ wiki:20_rdc_charger:15_hardware:22_wm-1 [2023/05/26 13:04] (current) – external edit 127.0.0.1
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+====== Wireless Modbus-to-Modbus bridge ======
+**Wireless Modbus-to-Modbus bridge**
+<WRAP column 350px>
+{{ wiki:20_rdc_charger:03_hardware:wm1_module.png?nolink |}}
+</WRAP>
+<WRAP column 300px>
+| Model number: ^ WM-1       |
+| Frequency:    | ISM 868MHz (EU) |
+| Dimensions:   | 93x45x27 mm     |
+===== Applications =====
+  * Replacement for RS485 wiring solution with wireless. Optimal for long range Modbus RTU serial communications with half duplex configuration.
+</WRAP>
+<WRAP clear></WRAP>
+===== Installation and mounting =====
+  * :!: 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
+{{ wiki:20_rdc_charger:03_hardware:wm1_module_diagram.png?nolink&0x500  }}
+{{ wiki:20_rdc_charger:03_hardware:wm1_mounting.png?nolink&0x500  }}
+<WRAP pagebreak></WRAP>
+===== Features =====
+  * 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
+===== Technical specification =====
+| Power supply:          |                                230V, 50/60Hz, 1W |
+| Ingress protection:    |                                    IP20 |
+| Operating temperature: |                                 -20..50°C |
+| Storage temperature:   |                               -40..85°C |
+| Relative humidity:     |                              0..85% n/c |
+===== Terminals and wiring =====
+| To power sensor ^ A | RS485 bus  |
+| :::            ^ B | :::        |
+| :::            ^ C | :::        |
+| To power supply ^ L| 230V AC |
+| :::             ^ N| :::     |
+{{ wiki:20_rdc_charger:03_hardware:wm1_wiring.png?nolink&0x200  }}
+<WRAP pagebreak></WRAP>
+===== Serial configuration and timeout =====
+  * 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
+{{ wiki:20_rdc_charger:03_hardware:wm1_serial.png?nolink&0x500  }}
+===== Wireless binding =====
+==== Create new secure group ====
+  * 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.
+{{ wiki:20_rdc_charger:03_hardware:wm1_configuration_1.png?nolink&0x500  }}
+==== Add new device to the group ====
+  * 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.
+{{ wiki:20_rdc_charger:03_hardware:wm1_configuration_2.png?nolink&0x500  }}
+==== Topology examples ====
+  * 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
+{{ wiki:20_rdc_charger:03_hardware:wm1_topology.png?nolink&0x500  }}
+==== Multiple groups ====
+  * 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.
+{{ wiki:20_rdc_charger:03_hardware:wm1_multiplegroups.png?nolink&0x500  }}
+===== Connection check =====
+  * Press button shortly
+  * RF LED will blink shortly on each connected device
+  * Serial interface is unaffected
+{{ wiki:20_rdc_charger:03_hardware:wm1_connectioncheck.png?nolink&0x150  }}
+===== Factory reset =====
+  * 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.
+{{ wiki:20_rdc_charger:03_hardware:wm1_factoryreset.png?nolink&0x200  }}