Multiplexer Protocol Versions; Figure 14: Msc As Used In Version 3; Table 6: Version Differences For Msc - Siemens Mux_guide_v06 User Manual

Multiplexer User's Guide
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5.2 Multiplexer protocol versions

This section summarizes the differences of the existing multiplexer protocol versions.
1. No version check
•
No break signal is sent
2. First version including the version check
•
Additional features: Transparent signals DTR and RTS, escape sequence +++
transportable via MSC
3. Advanced version integrated in all modules listed in Chapter 1.1
•
All features of version 2
•
Transparent signals DSR, CTS, RING and DCD
•
Send MSC request from module to host after version check on every channel to
signal the initial state
Modem status command (MSC):
d Length
Comman
1 octet 1 octet
Command:
Bit 1 Bit 2
1 C/R
Version specific differences in handling the modem status command MSC are explained in
Table 6.
V.24 signals:
Bit 1 Bit 2
1 FC

Table 6: Version differences for MSC

Version RTC
number Host application ⇒ Module
1 1
If 0 is indicated, all calls are terminated
2 DTR
3 DTR
Mux_guide_v06
DLCI
1 octet
Bit 3 Bit 4
0 0

Figure 14: MSC as used in version 3

Bit 3 Bit 4
RTC RTR
RTR
RTS
RTS
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V.24 signals
1 octet
Bit 5 Bit 6
0 1
Bit 5 Bit 6
reserved 0 reserved 0 RING
RTC RTR RING DCD
Module ⇒ Host application
1
DSR
s
m
o b i l e
Break Signals
(optional)
1 octet
Bit 7 Bit 8
1 1
Bit 7 Bit 8
DCD
Not used
Not used
CTS RING DCD
30.06.2004