User Manual
3-channel HART/Modbus TCP Gateway
GT200-3HT-MT
WWW.SSTCOMM.COM
38
5 Working Principle
The gateway internally opens up a length of 8156 bytes of memory as input and output buffers which
exchange data. 0 ~ 4999 memory is used as the storage area of the HART input data and output data. 5000~8155
memory is used as the storage area of the status of three HART channel and control variables. The specific
assignment is shown in the table below:
Gateway
memory
address
Corresponding
Modbus register
address
Data shift
offset in
channel
Read/write
permission
Description
Three
HART
channel
sharing
memory
0-2999
0-1499
readable
The HART data input
area
3000-499
9
1500-2499
readable,
writable
The HART data output
area
HART
channel 1
5000-501
9
800-809
0-19
readable
Device 0_cmd0 data
5020-503
9
810-819
20-39
Device 1_cmd0 data
……
……
……
Device 15_cmd0
data
5320
960H
320
Gateway status
5321
960L
321
Gateway HART port
sending times
5322
961H
322
Gateway HART port
receiving times
5323
961L
323
HART communication
error times
1924-194
3
962-971
Reserved
5324
972H
324
Device 0_cmd0
response status
5325
972L
325
The response status of
device 1_cmd0
的
……
……
……
The response status
Device15 _cmd0
5340-543
980-1059
340-439
The response status of