4-169
4-4 Communication Function
4
Functions
<Reading Holding Register Content [03h]>
Reads consecutively the specified number of holding register contents from the specified holding
register address.
(Example)
Read past trip data from the Inverter with slave address 5.
Below is the data on past three trips:
Read the data received in response, as follows:
If the holding register content has not been read out normally, refer to the "Exception Response"
section.
RX command d081 (Previous factor) d081 (Previous Inverter status)
Holding register No. 0012h 0013h
Trip factor (high-order) Overvoltage (E07) During deceleration (02)
Query Response
No. Field name
Example
(HEX)
No. Field name
Example
(HEX)
1 Slave address
*1
05 1 Slave address 05
2 Function code 03 2 Function code 03
3 Register start number (MSB)
*2
00 3 Number of data bytes
*3
04
4 Register start number (LSB)
*2
11 4 Register start number (MSB) 00
5 Number of holding registers (MSB) 00 5 Register start number (LSB) 07
6 Number of holding registers (LSB) 02 6
Register start number +1
(MSB)
00
7 CRC-16 (MSB) 95 7
Register start number +1
(LSB)
02
8 CRC-16 (LSB) 8A 8 CRC-16 (MSB) 36
*1. Broadcasting cannot be performed.
*2. Note that the start number is reduced by 1.
9 CRC-16 (LSB) 37
*3. Transfers data by the number of data bytes. In
this example, the Inverter sends response data
on two holding registers (4 bytes).
Response buffer 4 5 6 7
Holding register start
number
+0 (MSB) +0 (LSB) +1 (MSB) +1 (LSB)
Response data 00h 07h 00h 02h
Trip cause Overvoltage trip During deceleration
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