Rockwell Automation 2706-P42_P43_P44_P72_P74_P92_P94 InView Marquee Message Display User Manual - Manual (Page 112)

Publication 2706-UM016D-EN-P - March 2006
4-46 InView Protocol
Clear the Display Memory
Set Message Size
The message size is the number of bytes that each message can be
stored in. This message size will partition the displays memory based
on the number of bytes used in the message size. When this
command is used, it (generally, based on model of display) takes
200,000 bytes and divides it by the number of bytes used for the
message size. For example, 2,000 message partitions would be
available if the message size was set to 100 bytes (200,000 bytes/100
bytes/message = 2,000 messages).
The number of bytes used in each message is the number of bytes
used from the <SOH> to the <EOT> inclusive. Therefore, care must be
used to insure that the number of bytes sent does not exceed the
Message Size. The range for the message size is 50 bytes to 450 bytes.
The following is the message data used to set the message size.
Special Function command to Clear Display Memory
<SOH> Type Code Display Address
Description ASCII Hex Description ASCII Hex Description ASCII Hex
Start of Header ^A 01 All displays Z 5A Display
Address 00 3030
Special Function command to Clear Display Memory
<STX> Command Code
Command Function
Description ASCII Hex Description ASCII Hex Description ASCII Hex
Start of Text ^B 02 Write Special Function E 45 Clear Memory $ 24
Special Function command to Clear Display Memory
<EOT>
Description ASCII Hex
End of
Transmission ^D 04