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Chapter 4
(ii) Reading registers [03h]
This function reads a specified number of registers beginning at a specified register address.
(Example)
When reading the trip history data from the inverter at slave address "5":
Assume that the conditions of the past three trips are as follows:
SJ700 command
Register number
Trip factor (upper digit)
Query
Field name
1
Slave address (*1)
2
Function code
3
Starting register number
(upper digit) (*2)
4
Starting register number
(lower digit) (*2)
5
Number of registers (upper digit)
6
Number of registers (lower digit)
7
CRC-16 code (upper digit)
8
CRC-16 code (lower digit)
*1 This query cannot be broadcasted.
*2 Note that the starting coil number is 1 less than the actual
coil number of the coil to be read first.
Read the data received in the response as follows:
Response buffer
Starting register number
If the function to read registers cannot be executed normally, the inverter will return an exception response. For
details, see Item (ix), "Exception response."
d081 (factor of most recent trip)
0012h
Overvoltage (E07)
Sample setting
(hexadecimal)
05
03
00
11
00
02
95
8A
+0 (upper
digit)
Response data
Trip condition
Trip due to overvoltage
d081 (inverter state at most recent trip)
Response
Field name
1
Slave address
2
Function code
3
Number of data bytes (*3)
4
Starting register number
(upper digit)
5
Starting register number
(lower digit)
6
Starting register number + 1
(upper digit)
7
Starting register number + 1
(lower digit)
8
CRC-16 code (upper digit)
9
CRC-16 code (lower digit)
*3 The data equivalent to the specified number of data bytes is
transferred. In this Example, 4 bytes are transferred because
the data on two registers is returned in the response.
4
5
+0 (lower
+1 (upper
digit)
00h
07h
4-134
Explanation of Functions
0013h
Decelerating (02)
Sample setting
(hexadecimal)
6
7
+1 (lower
digit)
digit)
00h
02h
Decelerating
05
03
04
00
07
00
02
36
37
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