Follow the Base Radio menu map, shown in Figure
Figure 6-4 Menu Map to Modbus Mapping Mode Setting
6.2Modbus Communication Protocol
The Base Radio connects to the Host (Master) system using Modbus over a serial RS- 485 line. The Base Radio supports Modbus RTU transmission mode at baud rates of 9600, 19200, 38400, 57600, or 115200 baud with even, odd, or no parity and 8 data bits. One stop bit is used if even or odd parity is selected and two stop bits are used if the no parity option is selected to fill out the character frame to a full
Note This device supports Modbus RTU (Binary) communications. Note that the
The Base Radio is always located at the device ID selected by the DEV ID menu item. Transmitters can be configured either to be assigned to an individual Modbus device ID or to holding registers within the Base Radio device ID through the appropriate selection in the MODMAP menu item. There are two MODMAP modes available: DEVMODE and
REGMODE.
If the device ID mode (DEVMODE) is selected, a Transmitter's data may be accessed with the Modbus Read Holding Register Command (03) by using the Transmitter's equivalent Modbus device ID. The Transmitter's equivalent Modbus device ID is the Base Radio's device ID + the Transmitter's RF ID. For example, if the Base Radio’s device ID was 10 and a Transmitter’s RF ID was 5, the Transmitter would be accessed under Modbus device ID 15. Using the device ID mapping mode adjusts the upper limit of the Base Radio’s device ID to 247 minus the number of Transmitters on the RF network. For example, if 5 Transmitters were on the Base Radio’s network, the maximum Modbus device ID would be 242.
If the
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