Appendix 1 Modbus Protocol
39
TI 01W01A56-01EN
[DEV_STATUS]
The Field Device operation status information is shown in the device status (DEV_STATUS).
The following table shows the attributes of the DEV_STATUS.
DEV_STATUS
(32bit x 8 : Unsigned16)
And the data elements of a device are mapped to Modbus registers as follows.
16
8 7
0
00000000
0x0080 (Reserved)
n
DEV_STATUS (Upper 16bit)
n+1
~
~
DEV_STATUS (Lower 16bit)
n+8
Below is an example of DEV_STATUS information.
Modbus
address
Name
Data format
Contents
n
Data status
Unsigned16
Usually 0x0080: Normal
n+1
DEV_STATUS
Unsigned16
Status of the field wireless device
(0: connected, 2: not connected)
n+2
Integer16
Battery life
(0>: days, <0: hours, 0x7FFF: external power source)
Unsigned16
Usually 0 (Reserved bits)
n+3 ~ n+8
Mar. 31, 2014-00