Modbus Supplement - Honeywell XYR 5000 Series User Manual

Honeywell Industrial Wireless

7. Modbus Supplement

Rev 5
08/06
This section applies only if you are using the Modbus
communications option for the Base Radio. If you are not using
this option please skip this section.
Modbus configuration is discussed in detail in Section 6 of the
Base Radio User Guide. This section discusses elements that
are specific to the Switch Input Transmitter and Switch Input with
Output Option Transmitter.
The following tables contain holding register values that differ for
the Switch Input Transmitter. These registers are bit field
registers composed of two 16-bit registers and interpreted as an
IEEE 32-bit floating point value for Transmitters.
Device Type Holding Registers
The following values are for the Device Type holding registers.
Value Device Type
26 Switch Input Transmitter
27 Switch Input Transmitter with Output Option
Device Status Holding Registers
The following values are for the Device Status holding registers.
Value Device Status
1 Device (Transmitter) Online
2 Low Battery
4 Alarm Condition
8 Transition on Input Switch 1
16 Transition on Input Switch 2
32 System Error Condition
64 Input Switch 1 Position = Closed
128 Input Switch 2 Position = Closed
The above values are still converted from Modbus as 32-bit
floating point values. For ease of use, we've arranged each
status to correspond to a bit in an imaginary 8-bit binary field,
logic high.
The status can be resolved by subtracting the largest number
listed above from the value received from the holding register,
and then subtracting the next highest and so on until the result is
0. Each of the values used indicates the respective condition
listed above.
Example #1: If the holding register reads 65, subtract 64 and get
1. Then subtract 1 from 1 and get 0. Thus from the list below,
Input Switch 1 is closed (64) and the Transmitter is online (1).
Example #2: If Input Switch 1 is Open and Input Switch 2 is
Open, and no additional conditions exist, the value is 1. Now if
User Manual
Wireless Dual Discrete Input Transmitter
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