Rockwell Automation 2706-P42_P43_P44_P72_P74_P92_P94 InView Marquee Message Display User Manual - Manual (Page 104)

Publication 2706-UM016D-EN-P - March 2006
4-38 InView Protocol
Response:
The normal response to a function 10 query is to echo the address,
function code, starting address and the number of registers that were
loaded.
Response for Updating Variable Registers using a 10 Frame
Read the Message Queue using a Modbus ASCII 03 frame
This function allows the ability to read message numbers that are
currently running in the message queue on a display. A maximum of
64 registers can be read since there is a maximum of 64 registers (or
concurrently running messages) in the message queue. The following
is an example of request for the first 3 registers in the message queue
(Registers 40103 through 40105) which contain message data values 4,
6, and 11 respectively in display address 010.
Transmission:
Query for Requesting Message Queue Data
Response:
The addressed slave responds with its address and the function code,
followed by the information field. The information field contains 2
bytes describing the quantity of data bytes to be returned. The
contents of the registers requested (DATA) are two bytes each, with
the binary content right justified within each pair of characters.
TIP
Use of the Guaranteed mode for variable updates,
messages may not be displayed as expected.
Beginning
of Frame ADDR FUNC H.O.
ADDR L.O.
ADDR QUANTITY LRC
Error EOF Ready to
rec. resp
: 03 10 00 00 0003 EA CR LF
Beginning
of Frame ADDR FUNC H.O.
ADDR L.O.
ADDR DATA Number
of register to
read LRC
Error EOF Ready to
rec. resp
: 0A 03 00 66 0003 8A CR LF