7.4.4 Adjusting the Receive Slots and Retry Count Parameters
The number of receive slots governs how often a MultiHop device can communicate on the wireless network.
Battery-powered devices typically have DIP switches that allow the user to set the number of receive slots, which directly
affects the battery life of the radio. Adjusting the receive slots changes how often a message can be received. By default, the
receive slots are set to 4 (every 1.3 seconds). When the receive slots are set to 32, the radio listens for an incoming
message every 0.16 seconds.
Users may also leave the retry mechanism to the application that is accessing the wireless network, in this case the
DXM700. Adjust the number of retries in the MultiHop devices by writing the number of retries desired to Modbus register
6012. The factory default setting is 8.
7.4.5 Calculating the Communication Timeout for a DX80 Star
Network
In the DX80 network, all Node data is automatically collected at the Gateway to be read. The DXM700 does not use the
wireless network to access the data, which allows for much faster messaging and much lower timeout values.
For a DXM700 with an internal DX80 Gateway, set the timeout value 0.5 seconds. If other Modbus slave devices are
connected to the RS-485 lines, the timeout parameter governs all communication transactions and must be set to
accommodate all devices on the bus.
7.5 Modbus TCP Client
The DXM700 can operate as a Modbus TCP client on Ethernet. Users may define up to five socket connections for Modbus
TCP server devices to read Modbus register data over Ethernet. Use the DXM Configuration Software to define and
configure Modbus TCP client communications with other Modbus TCP servers.
Sure Cross
®
DXM700-Bx Wireless Controller
46
www.bannerengineering.com - Tel: + 1 888 373 6767