ecification
z Response
Field name
RTU mode data
(8 bits)
Data length
(bytes)
Remarks
Header None -
Slave address 3F H 1 Fixed.
Function code 03 H 1
Data bytes 04 H 1 1-word register x 2 = 4 bytes
Data 1 (upper) Arbitrary
Data 1 (lower) Arbitrary
1 each for upper
and lower words
2
Data 2 (upper) Arbitrary
Data 2 (lower) Arbitrary
Same as above
Data of gateway status signal 0, 1
Error check (CRC)
Based on
calculation result
2
Trailer None -
Total bytes Arbitrary
z Actual Example
Sent Query: 3F03F7000002F2A1
Received Response: 3F030480210003
1C3B
Gateway status signal 0 is “8021H,” while status signal 1 is “0003H.” In other words, the RUN, W8B1, W4B1, LNK1
and LNK0 signals are ON.
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