130 Chapter 8 - Modbus RTU Protocol User Manual
Example: Modbus
Drive address 10 (0A
hex
)
Coil 1186 (04A2
hex
)
ADDR FUNC DATA DATA DATA DATA CRC CRC
start start bit# bit#
Addr HI Addr LO HI LO HI LO
0A 01 04 A1 00 01 AC 63
Response
The request refers to the content of the Coil 1185 which does not exist in the Drive slave. The slave answers with
the error code 02 (ILLEGAL DATA ADDRESS) and goes back to the function code 81h (129).
Example: Exception to the above mentioned request.
ADDR FUNC DATA CRC CRC
Except.
Code HI LO
0A 81 02 B0 53
8.5.1 Exception codes
This protocol implementation foresees only four exception codes:
Code Name Meaning
01 ILLEGAL FUNCTION The received function code does not correspond to a function allowed on the addressed slave.
02 ILLEGAL DATA ADDRESS The address number, which the data field refers to, is not a register allowed on the addressed slave.
03 ILLEGAL DATA VALUE The value to be allocated, which the data field refers to, is not allowed for this register.
07 NAK - NEGATIVE The function can not be performed with the present operating
ACKNOWLEDGEMENT conditions or attempt to write an only-reading parameter.
8.6 System configuration
In order to select the configuration of the serial line, the AGy drives of are supplied in the main INTERFACE menu with a
submenu called Serial config; some parameters are common to the different kinds of implemented protocols (fOX LINK,
Modbus, etc); the menu contains the following parameters:
Code LCD display [Code] & LCD select. Default MIN MAX Unit Variation IPA
I.600 Serial link cfg [0] FoxLink 7E1 4 0 5 155
[1] FoxLink 701
[2] FoxLink 7N2
[3] FoxLink 8N1
[4] ModBus 8N1
[5] JBus 8N1
I.601 Serial link bps [0] 600 baud 4 0 9 156
[1] 1200 baud
[2] 2400 baud
[3] 4800 baud
[4] 9600 baud
[5] 19200 baud
[6] 38400 baud
[7] 57600 baud
[8] 76800 baud
[9] 115200 baud
I.602 Device address 0 0 99 1 157
I.603 Ser answer delay 1 0 250 msec 1 158
I.604 Serial timeout 0 0 25 sec 0,1 159
I.605 En timeout alm [0] Disable 160
[1] Enable
To Next Page
Loading...
