Rockwell Automation 2706-MB1 MESSAGEVIEW 421 SOFTWARE MANUAL - Manual (Page 165)

7–44 Creating Messages
Publication 2706-817
If the Optional Display Mode Byte is omitted, the message will
remain displayed on the slave device unless it is cleared. If the
message is longer than the packet length, the first segment of the
message remains displayed for 1 second. After 1 second the second
packet is sent with the next portion of the message, and so on until
all packets have been sent. The message will repeat this cycle unless
it is cleared.
If Auto Format is enabled,the Optional Display Byte defaults to the
default status unless the Scroll or Center Message attribute is
enabled.
The Optional Display Mode Byte may be manually placed in the
message by embedding it as the last character in the text portion of
the message. It overrides a character embedded by Auto Format.
Field 4: Slave Address
The Slave Address Byte is a single byte field that specifies the Node
Address of the receiving slave device. Valid slave node addresses are
integers from 1 to 127, except for 13.
Note: If a Slave Device has a Node Address of 127, it will respond
to all messages, regardless of the slave packet address. If a message
packet has a Node Address of 127 it will be received by all slave
devices on the network.
Field 5: Line Number Byte
The Line Number Byte indicates the display line on which the
message will appear. The Line Number Byte is automatically
embedded in the slave packet based on the message’s Line attribute.
Line Attribute Selected Line Number Embedded
1 1
2 2
3 3
4 4
Any
1 to 4, depending on the line where the Master
device displays the message
All 50
The “All” Line attribute (50) is used with the Ctrl-C Optional
Control Byte to clear all lines on the slave device.
The Line Number Byte function depends on the slave device and its
functions. Consult the slave device’s user manual for the line
configurations it supports.