Omron MX2 Series - Read from Holding Register [03 Hex]

8 Communications Functions
8 - 12
Multi-function Compact Inverter 3G3MX2-EV2 User’s Manual (I666-E1)
The data received in a response shows the status for coils 0007 to 000D hex. Therefore, the received
data “45 hex = 0100 0101b” can be read, with the status for coil 0007 hex as the LSB, as described in
“Response” on the previous page.
The received data is always transferred in 1-byte (8 bits) format. Bits that lack data are transferred as 0.
If the Read Coil Status function is not executed normally, refer to 8-5-9 Exception Response on page
8-20.
(Example) When the status of 16 coils starting from coil number 0001 hex is read, the order of data is
as shown below. Data 1 is the initial byte data to be sent.
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
Data 1
0008 hex
0007 hex
0006 hex
0005 hex
0004 hex
0003 hex
0002 hex
0001 hex
Data 2
0010 hex
000F hex
000E hex
000D hex
000C hex
000B hex
000A hex
0009 hex
8-5-2 Read from Holding Register [03 hex]
Reads the contents of consecutive holding registers. From the specified holding register, the specified
number of holding registers can be read.
⚫ Query
(Register address) = (Register number) − 1
6 registers
No.
Field name
Example
[hex]
1
Slave address
*1
01
2
Function code
03
3
Register start address (MSB)
*2
00
4
Register start address (LSB)
*2
11
5
Number of holding registers
(MSB)
00
6
Number of holding registers
(LSB)
06
7
CRC-16 (MSB)
95
8
CRC-16 (LSB)
CD
Example. Reading Latest Trip Data (0012 to 0017 Hex) from Inverter
with Slave Address 1