Effective Date: 2/04
IL17574C
Page 5-9
IQ 300
Effective Date: 2/04
Page 5-9
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5.7
COMMAND DATA PASS THROUGH
A feature of the IQ 330 is its capability to pass INCOM commands/data directly via
the MODBUS command. Thus, with access to IL 17384 Parts A and B, every
INCOM product object and capability is available to the MODBUS master.
When the pass through command is issued the unit saves the INCOM response in
a holding register until the MODBUS Master queries for the last response. The Unit
makes no modification to or interpretation of the product response data.
The MODBUS master writes the product command data using function code 10 hex
beginning at register 6000 hex.
The data format for pass through data is given in Figure 5.3
The MODBUS master reads the INCOM product response to a pass through query
using either function 04 beginning at register 6100 hex.
The number of points (registers) of the read query is 2*nn – where nn is the number
of INCOM messages in the response.
The format of the data acquired by the IQ 330M from the pass through INCOM
product query’s response is given in Figure 5.4 . Note that each INCOM response
message contains a status byte which indicates its validity.
15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
Register 424577 (6000
16
)
Register 424578 (6001
16
)
nn = Number of Response
Msgs
from
INCOM Product
INCOM Msg Byte0
15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
INCOM Msg Byte1
INCOM Msg Byte2
0 = Reserved
0 = Data Msg / 1 = Control Msg
INCOM Msg Control Byte
Figure 5.3 Pass through to INCOM Product Query
Data Format
