Honeywell XYR 5000 LINE User Manual

 

device ID. The Base Radio uses register addresses 1 through 10 with each subsequent 
group of 10 registers used by a Transmitter. 

The RF online/offline status of a Transmitter can be determined through a number of 
different sources. In the Base Radio holding registers, a count of the current number of 
online Transmitters can be found at address 00004. Also the individual online/offline 
status of each Transmitter is stored in the Base Radio holding registers at addresses 
00005, 00006, 00007, and 00008. These registers are bit field variables with each bit of 
the 16-bit number representing the status of a Transmitter. If the bit is set, the 
corresponding Transmitter is online. If the bit is cleared, the corresponding Transmitter is 
offline. 

In the Transmitter holding registers, bit 1 in the Transmitter & Sensor Status holding 
register holds the online/offline status of the particular device. Any Transmitter that is 
currently offline will return NaN (Not a Number) when queried for its primary or secondary 
measurement value. Note that if a Transmitter is online and is a single measurement 
device type, NaN will also be returned for the Secondary Sensor Value, as the 
measurement does not exist in these devices. 

The Base Radio responds to six Modbus commands including the Read Holding 
Registers (03), Diagnostic (08), Get Com Event Count (11), Get Com Event Log (12), 
Report Slave ID (17), and Read Device Identification (43). The Read Holding Registers 
command provides the bulk of the functionality with the remaining commands being used 
for diagnostics/troubleshooting purposes. No other Modbus commands are supported 
and will be responded to with an ILLEGAL FUNCTION exception (code 01). A description 
of each command code is listed in the following sections. 

This command is used to read the contents of a contiguous block of holding registers in a 
Base Radio or Transmitter. If an invalid register address is requested, an ILLEGAL DATA 
ADDRESS exception (code 02) will be returned. 

Section 6.4 lists the holding registers for the Base Radio and Transmitters, as well as 
how to understand the contents of the registers. 

This command provides a number of tests for checking the communications between the 
Base Radio and the Host master device. 

 

 

0  Return Query Data 
1  Restart Communications Option 
2  Return Diagnostics Register 
3  Change ASC-II Input Delimiter (NOT SUPPORTED) 
4  Force Listen Only Mode 

5-9 NOT 

USED 

10  Clear Counters & Diagnostics Register 

11

Return Bus Message Count 

 

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