Software Procedures Related to RS232 HW Lines
B-4 AT Commands Reference Manual December 31, 2007
Advanced Mode MUX Software Flow Control Per Channel
The MUX software flow control per channel is not implemented in G24 internal MUX.
MUX Modes
The following table describes the differences between each mode in a non-ERM environment.
Note: The length is still required in the information field of the UIH frame.
Advance Mode Transparency Mechanism
There is a set of protected characters that cannot appear between the start and end flags. These
characters are protected by the transparency mechanism within the following fields: address,
control, information and FCS. This mechanism is detailed in the packing/unpacking subsections
that follow.
Table B-1: MUX Mode Differences
Feature Basic Mode Advanced Mode
Start flag 0xF9 0x7E
Close flag 0xF9 0x7E
Length field Yes N o
Data transparency No Yes
Frame UIH (or UI) UIH (or UI)
Processing cost Low High
Recovery of
synchronization
Slow Quick
SW flow control per
channel
Yes N o
Table B-2: Protected Characters
Protected Characters Value Encoded Value
Flag sequence (SOF,
EOF)
0x7e 0x7d, 0x5e
Control escape 0x7d 0x7d, 0x5d
XON 0x11 0x7d, 0x31
XOFF 0x13 0x7d, 0x33
To Next Page
Loading...
