Case Communications Mayze 24, Reference Manual, Page: 133 / 166

10 V.25bis Commands
Before you can issue V.25bis commands, you must first put the modem into
V.25bis mode by issuing the relevant
*V command. You exit by the BAK
command.
The modem includes some commands that are additional to the standard
V.25bis set.
10.1 Command Structure
• Byte synchronous V.25bis commands must be entered via the DTE
port in the format:
<SYN><SYN><STX> Command <ETX>
where: <SYN> represents a synchronous-idle character (hex 16)
<STX> represents a start-of-text character (hex 02)
<ETX>
represents an end-of-text character (hex 03)
The hex values given above apply when using ASCII.
Characters should be sent as consecutive 8-bit words of 7 data bits and
odd parity when using ASCII.
• HDLC synchronous character-oriented V.25bis commands must
be entered via the DTE port in the format:
<F><A><C> Command <FCS><F>
where:
<F>
represents the HDLC flag character
<A> represents 11111111
<C> represents 11001000
<FCS>
represents a checksum automatically calculated
<A> and <C> are given as in the ITU-T Recommendation with the
LSB shown first. Because the command field is a U1 frame transmitted
with the P bit set to 1 and the global address, <A> and <C> have to
be set as above.
Characters should be sent as consecutive 8-bit words of 7 data bits with
the eighth bit as “don't care”.
X460-306851 Issue 1 10-1 Rev.1