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Appendix F – Embedded Control Characters
When using WaveWare mode it is not necessary to make use of the
<SUB>
control character. Since WaveWare mode
does not use the
<CR>
control character it is only necessary to hit carriage return on your keyboard to have it show up on
the pager display.
To embed a control character in a
TAP
mode paging message however, it is necessary include a
<SUB>
control
character followed by an offset version of the control character you want to embed. You offset the control character by
adding
40 HEX
to the control character, to make the character printable. Adding
40 HEX
to Carriage
Return gives you
M
.
Adding
40 HEX
to Line
Feed gives you
J
. The character combination of
<SUB>M
causes a Carriage Return control
character to be embedded in the encoded paging message, while
<SUB>J
causes a Line Feed control character to be
embedded. The
<SUB>
character needs to be passed to the
WaveWare v
8
Paging Encoder
as a
HEX
character.
In the
WaveWare v
8
Paging Encoder Setup
software, you can embed a Carriage Return by entering
<CR>
in the
message body, and embed a Line Feed character by entering
<LF>
in the message body. The use of the
<SUB>
character will be done by the software.
In the
Microsoft Visual Basic
programming language, you can use the following code example to define the embedded
control character string to be delivered through the serial port to the paging system. In this example, we are embedding
only the
Carriage Return
control character:
DIM CarriageReturnString As String,
DIM MessageLine1 As String
DIM MessageLine2 As String
DIM TXString As String
CarriageReturnString = Chr(26) & "M"
LineFeedString
= Chr(26) & "J"
MessageLine1 = "Line 1 of test message"
MessageLine2 = "Line 2 of test message"
TXString
= MessageLine1 & CarriageReturnString & MessageLine2
form1.MSComm1.Output
= TXString
This completes the “Embedded Control Characters”
