Rockwell Automation 2706-P42_P43_P44_P72_P74_P92_P94 InView Marquee Message Display User Manual - Manual (Page 79)

Publication 2706-UM016D-EN-P - March 2006
InView Protocol 4-13
For example, when using priority messaging, messages are sent to
holding register 40103. The register number that is transmitted would
be (40103-40001=102) or 102 (0x66) would be transmitted at 100
(64h). The following shows the memory map for the displays.
Methods of Transmission
There are eight different methods of transmission of data to and from
the display. Each one of these use 1 of 4 different Modbus function
codes.
The table, Modbus Function Codes used in InView Products, explains
each of the four Modbus ASCII function codes used. The table,
Methods of Transportation, shows the eight methods of using these
codes with the product.
Memory Map
Modbus Holding Registers Registers Description
40001 001 Variables registers
Variables 001-100 (00-99 with automation
software)
… …
40100 100
40101 101 Add a Message/Downloading of messages
40102 102 Remove a Message
40103 103 Message Queue/Priority Messaging
… …
40167 167
Modbus Function Codes used in InView Products
Function
Code Function
Code Hex Modbus
Meaning Action.
01 01 Read Coil status Used to signal the downloading messages to the display.
03 03 Read Output
Registers Query Used to read registers in a display.
06 06 Preset Single
Register Used to preset a single register in a display (Priority Messaging, Update Variables, and
Add/Remove a Message).
16 10 Preset Multiple
Registers Used to preset multiple registers in a display (Add/Remove a Message or Update
Variables).