Error Response - Mitsubishi Electric 800 Series Instruction Manual

Example) Read the successful register start address and number of successful access from slave address 25 (H19).
Query message
Slave Address Function
H19 H46
(8 bits) (8 bits)
Normal response (Response message)
Slave Address Function
H19 H10
(8 bits) (8 bits)
Two successful reads of start address 41007 (Pr.7) are returned.
4.5.11

Error response

• An error response is returned if the query message received from the master contains an illegal function, address or data.
No response is returned for parity, CRC, overrun, framing, and Busy errors.
NOTE
• No response is also returned in the case of broadcast communication.
• Error response (Response message)
a. Slave Address
H80 + Function
(8 bits)
(8 bits)
Message
a Slave Address
b Function
c Exception Code
CRC Check
H8B HD2
(8 bits) (8 bits)
Starting Address
H03 HEE
(8 bits) (8 bits)
b. Function c. Exception Code
(8 bits)
Set the address received from the master.
The function code requested by the master + H80 is set.
The codes in the following table are set.
No. of Points
H00 H02 H22
(8 bits) (8 bits) (8 bits)
CRC Check
L H
(8 bits) (8 bits)
Description
CRC Check
H61
(8 bits)
PARAMETER
4
75