Mod Bus Instruction Operation Example - Ebyte ME31-XAXA0404 User Manual

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active upload
MOSBUS
TCP/RTU
conversion enable
MODBUS address
filtering

4.7.5 Mod bus instruction operation example

1. Read Coil (D O ) Status
Use the read coil state (01 ) function code to read the output coil state, for example:
01
Modbus address
After sending the above command to the device through the 485 bus, the device will return the following values:
01
M odbus address
The above returned status data 0 1 indicates that the output DO 1 is turned on .
2. Control Coil (D O ) Status
Support operation of single coil (0 5 ), operation of multiple coils ( 0F ) function code operation.
Use the 0 5 command to write a single command, for example :
01
Modbus address
After sending the above command to the device through the 485 bus, the device will return the following values:
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23
holding
0x08E7
register
holding
0x08E8
register
holding
0x08E9
register
01 00 00
register first
function code
address
01
function code
05
function code
0x0000 disabled, others:
1 R W 1 ～ 6 5535 s periodic
sending
1 R W
1 R W
Number of output coils read
01
bytes of data returned status data
00 00
Conduction: F F 00
register first address
ME31- XAXA0404 _User Manual
0, close, 1 open protocol
conversion
0: transparent
transmission, 1-255:
when the data is not
local, check the slave
address of the command
command, and it can be
passed when it is the set
value
00 0 4
0 1
CRC check code
FF 00
CRC check code
Off: 0 0 00
R : 0x03
W : 0x06 , 0x10
R : 0x03
W : 0x06 , 0x10
R : 0x03
W : 0x06 , 0x10
3D C9
CRC check code
90 48
8C 3A