Siemens TC45 Manuel de l'utilisateur - Page 34

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Siemens TC45 Manuel de l'utilisateur
Multiplexer User's Guide
Confidential / Released

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