P3 - Pakscan Master Station Technical Manual
18 of 136 Publication PUB059-002-00 Issue 06/15
1.11 Setting up the P3W Repeater and P3W WMA
The P3W Repeater requires the PAN ID (Personal Area Network Identification number) and RF
Channel to be set up for the network to which it is attached. The P3W WMA also requires these
parameters and its Modbus communication parameters to be set up. This is achieved using the
Modbus interface that is available on both modules.
The Modbus physical connections are detailed in the previous section ‘P3W WMA (Wireless Modbus
Adapter) Modbus Connections’. For the purpose of configuration, these connections can be
temporary, for example, it may be more convenient to make the configuration changes in a workshop
before installation on site. For both devices it is likely that configuration is only required once,
therefore after installation there should be no need to access the Modbus connections again on the
P3W repeater.
During configuration in a workshop environment, the 2 halves of the module can be separated, such
that the Wireless module is disconnected from its power supply module. The wireless module can
then be powered, separately, using a 24VDC source as described in the previous section ‘P3W WMA
(Wireless Modbus Adapter) 24VDC Connections’.
For making configuration changes to the P3W Repeater or P3W WMA, there is a fixed Configuration
Modbus address of 248.
The P3W Repeater, requires the PAN ID and RF Channel to be set up, and if there are multiple P3W
repeaters the Modbus slave address must be set up such that all P3W repeaters are unique and can
appear as separate nodes on the wireless network.
The P3W WMA requires the Modbus communication parameters (baud rate and parity) to be set up,
as appropriate for communicating to the Modbus slave device it is to be connected to. The Modbus
slave device address is not required to be set up within the P3W WMA, as it will automatically scan for
attached devices using the baud rate and parity set. Up to 10 slave Modbus devices can be
connected, each device will require a unique Modbus address, within the range 201 to 247. The
address must be unique for the host device to be able to access it. Within the master station
configuration pages, the Modbus addresses used for the devices fitted to the P3W WMAs are required
to be selected. See section 7.5.17 master station configuration.
Changes to RF communication parameters will take place immediately. Changes to Modbus
communication parameters will take effect after a power cycle.
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