Accutech WI-BR-I-XP, Руководство пользователя

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Rev 1.56
11
Configuring the Modbus Communications
Section 6
This section applies only if you have ordered the Modbus communications
option for the Base Radio. The Base Radio identification number should
read WI-BR-I-XP-MOD. If you have not ordered this option please skip
this section. The subsections are as follows:
6.1: Base Radio Setup
6.1.1: Modbus Baud Rate Setting
6.1.2: Modbus Device ID Setting
6.1.3: Modbus Parity Setting
6.1.2: Modbus Mapping Mode Setting
6.2: Modbus Communication Protocol
6.3: Modbus Commands
6.3.1: Command 03-Read Holding Registers
6.3.1.1: Base Radio Holding Registers
6.3.1.1.1: Base Radio Device Type Holding Registers
6.3.1.1.2: Base Radio Device Status Holding Registers
6.3.1.1.3: Base Radio On/Offline Field Unit Registers
6.3.1.2: Field Unit Holding Registers
6.3.1.2.1: Field Unit Device Type Holding Registers
6.3.1.2.2: Field Unit Device Status Holding Registers
6.3.2: Command 08-Diagnostic
6.3.3: Command 11-Get Com Event Counter
6.3.4: Command 12-Get Com Event Log
6.3.5: Command 17-Report Slave ID
6.3.6: Command 43-Read Device ID
6.1: Base Radio Setup
The purpose of this section is to guide the user through the configuration
of the Base Radio in order to enable communications with the user’s par-
ticular Modbus Protocol.
6.1: Modbus Baud Rate Setting
In order for the Base Radio to communicate with other devices, such as
the server computer, or an existing PLC/DCS system, they must share the
same Modbus Baud Rate.
To set the Modbus Baud Rate, first determine which rate your system re-
quires. If your system will allow any baud rate, we suggest you use the
fastest setting; however, some systems cannot handle these faster baud
rates due to external noise and transmission distance, so if you encounter
communication problems between the Base Radio and server computer or
existing system try a slower baud rate setting.
Once you have determined the Modbus Baud Rate you wish to use; follow
the Base Radio menu map shown in Figure 6.1 to configure the Baud Rate.
Figure 6.1: Menu Map to Modbus Baud Rate Setting
NOTE
This
device supports Modbus RTU (Binary)
communications. Note that the ASC-II transmis-
sion mode is not supported.