Ebyte 4440-GPRS User Manual page 19

Wireless Data Transceiver
Transmi
ssion Protocol
identifie identifier
r
00 01
Transmi
ssion Protocol
Receive
identifie identifier
r
Function code 0x04, read AI1 input, assuming AI1 input is 9946uA, the corresponding value
should be 0x0x26DA
Modbus RTU read analog quantity input:
01
Device ModBus
Send
address
01
Device ModBus
Receive
address
Modbus TCP read analog quantity input:
00 01
Transmi
ssion Protocol
Send
identifie identifier
r
00 01
Transmi
ssion Protocol
Receive
identifie identifier
r
4.2.4 Analog quantity input AI range setting
When register 0x40084(0x0053）is 0, analog quantity input range is 0 -- 20mA;
When register 0x40084(0x0053）is 1, analog quantity input range is 4 -- 20mA;
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Unit
Length identifie
r
00 00 00 05 01
Unit
Length identifie
r
04 00 10
Function
Start address
code
04
Function
Bytes returned
code
00 00 00 06 01
Unit
Length identifie
r
00 00 00 05 01
Unit
Length identifie
r
Functi
Analog quantity
on
address
code
03 02
Functi
on Bytes returned
code
00 01
Write number of
switch quantity
02 26 DA
Write value
04 00 10
Functi
Analog quantity
on
address
code
04 02
Functi
on Bytes returned
code
E850-DTU(4440-GPRS) datasheet
Write number
of analog
quantity
26 DA
Write value
30 0F
CRC code
22 CB
CRC code
00 01
Write number
of analog
quantity
26 DA
Write value
19