Effective Date: 2/04
IL17574C
Page 5-11
IQ 300
Effective Date: 2/04
Page 5-11
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Field Name
Example
(HEX)
Slave Address
TBD
Function
10
Address Hi
60
Address Lo
00
Quantity of Registers Hi
00
Quantity of Registers Lo
02
Byte Count
04
INCOM Msg Byte 0
03
INCOM Msg Control Byte
84
INCOM Msg Byte 2
50
INCOM Msg Byte 1
00
Error Check (LRC or CRC)
--
Table 5.7 Example INCOM 305 Command
Field Name
Example
(Hex)
Slave Address
TBD
Function
10
Starting Address Hi
60
Starting Address Lo
00
Number of Registers Hi
00
Number of Registers Lo
02
Error Check (LRC or CRC)
--
Table 5.8 Example Response
Field Name
Example
(HEX)
Slave Address
TBD
Function
04
Starting Address Hi
61
Starting Address Lo
00
Number of Points Hi
00
Number of Points Lo
06
Error Check (LRC or CRC)
--
Table 5.9 Example
The INCOM Pass Through
capability is a powerful tool, it
allows you to retrieve any data
that you could have retrieved
with INCOM while using the
MODBUS protocol. The
Pass Through method
requires the use of the sixteen
command to start the INCOM
request, followed by the four
commands to read the
response beginning at
register 6100. Table 5.7 is an
example of the INCOM 305
command.
The normal response returns a
slave address, function code,
starting address and quantity of
registers preset. Table 5.8 is an
example of the response to the
query shown above.
Now you must retrieve the
information starting at register
6100. First you need to know how
many resisters to retrieve.
Second, be able to decipher the
INCOM floating point format that
they will be in, along with the
details individually related to each
command. Table 5.9 is an
example.
Refer to IL 17384 Part B related to
IQ 330 for additional information.
