Part 1 specification – IAI America REXT User Manual
Page 152
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Part 1 Specification
Chapter 3 Gateway R unit
128
Part 1 Specification
(2) Examples of Queries/Responses
Queries are implemented by reading a 1-word register and thus the basic pattern is the same with all queries. The only
differences are the starting address and data.
[1] Read gateway status signal 0, 1
The configuration of the completed position number register of axis (0) is shown below.
z
Query
Field name
RTU mode data
(8 bits)
Data length
(bytes)
Remarks
Header
None
-
Slave address
3F H
1
Fixed.
Function code
03 H
1
Starting address
(upper)
F7 H
Starting address
(lower)
00 H
2
Initial address of gateway status signal 0, 1
Number of registers (upper)
00 H
Number of registers (lower)
02 H
2
Number of registers (1 register = 1 word): 2
Error check
(CRC)
Based on
calculation result
2
(F2 A1)
Trailer
None
-
Total bytes
8
Address
Address
Gateway
status signal 0
Gateway
status signal 1
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