Amtech
11.12
10
11
E210
40470
E310
40515
E410
40485
E510
40530
E610
40500
E211
40471
E311
40516
E411
40486
E511
40531
E611
40501
E212
40472
E312
40517
E412
40487
E512
40532
E612
40502
E213
40473
E313
40518
E413
40488
E513
40533
E613
40503
E214
40474
E314
40519
E414
40489
E514
40534
E614
40504
E215
40475
E315
40520
E415
40490
E515
40535
E615
40505
/Group
ID
/Group
ID
/Group
ID
/Group
ID
/Group
ID
/Group
ID
E701
40536
G101
40551
G201
40566
G301
40581
G401
40596
G501
40611
~
~
~
~
~
~
~
~
~
~
~
~
E715
40550
G115
40565
G215
40580
G315
40595
G415
40610
G515
40625
/Group
ID
/Group
ID
/Group
ID
/Group
ID
/Group
ID
/Group
ID
G601
40626
G606
40631
G611
40636
H101
40647
G602
40627
G607
40632
G612
40637
H102
40648
G603
40628
G608
40633
G613
40638
H103
40649
G604
40629
G609
40634
G614
40639
H104
40650
G605
40630
G610
40635
G615
40640
H105
40651
5. Description of Different Queries Used for communication
5.1 Read Single Parameter
This query is used for single parameter read. Total 8 bytes are transmitted. 3.5-character times delay
is provided at the start and end of the query for indication of starting and ending of query. The 3.5
character time is calculated as below.
If 9600 baud rate is used then
Delay = (3.5*11)/9600 = 4.01 mSec
For example if you want to read parameter 40003 (Output Current) then the format of query is as
below.
Number
1 01h First byte is the address of the modbus slave device referred as station
number.
2 03h Indication of read operation
3 00h Starting address High byte
4 02h Starting Address Low byte. Parameter 40003 is addressed as 0002h.
Byte 3 and 4 has right justified packed value of parameter number.
5 00h No of parameters High Byte
6 01h No of parameters Low Byte. If only one parameter is to be read then 01h
is used. More than one parameter can be read.
7 CRC Low CRC Low Byte
8 CRC High CRC High Byte. The High and Low bytes are reversed in CRC
transmission. The method of calculating CRC is described in the next
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