Honeywell ISM BAND XYR 5000 LINE - Manual (Page 32)

6.1.3 Modbus Parity Setting
The Modbus Parity distinguishes which type of parity is used to validate each packet of
information on the RS-485 Network. The type of parity required is usually indicated by the
user’s PLC.
Selecting EVEN or ODD parity will automatically include one STOP bit per frame.
Selecting a parity of NONE will automatically include two STOP bits as per the Modbus
communications specification.
Follow the Base Radio menu map shown in Figure 6-3 to configure the parity. The factory
default is EVEN parity.
Figure 6-3 Menu Map to Modbus Parity Setting
6.1.4 Modbus Mapping Mode Setting
The Modbus Mapping mode distinguishes which type of mapping mode is used to map
the Modbus registers according to the device IDs.
Note Make sure that the HI RF ID setting has been configured properly or the Modbus
addressing scheme could be affected. To properly set the HI RF ID setting see Section
4.2.
There are two possible mapping modes that can be used. The first is the Device ID
mapping mode. Using this mode gives the Base Radio a device ID equal to its device ID
setting. There are then 10 Modbus registers located at this device ID for this Base Radio.
Each Transmitter communicating with this Base Radio is then located at device ID X,
where X is the RF ID of the Transmitter + the Device ID of the Base Radio. There are 10
Modbus registers for each Transmitter located at that Unit’s device ID. For more
information on the registers, see Section 6.2: Modbus Communications Protocol.
The other possible mapping mode that can be used is the Register Mapping mode. Using
this mode gives the Base Radio a device ID equal to its device ID setting. Then, the 10
Base Radio Modbus registers are registers 1 – 10, and the Transmitter with RF ID 1 is
located at the SAME device ID as the Base Radio but its registers are registers 11-20.
Each subsequent Transmitter is mapped similarly. For more information on the registers,
Section 6.2: Modbus Communications Protocol.
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