Siemens Mux_guide_v06 - Manual (Page 34)

Multiplexer User's Guide
Confidential / Released
s
m
o b i l e
Mux_guide_v06 Page 34 of 36 30.06.2004
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):
Comman d
1 octet
Length
1 octet DLCI
1 octet V.24 signals
1 octet
Break Signals
(optional)
1 octet
Command:
Bit 1 Bit 2 Bit 3 Bit 4 Bit 5 Bit 6 Bit 7 Bit 8
1 C/R 0 0 0 1 1 1
Figure 14: MSC as used in version 3
Version specific differences in handling the modem status command MSC are explained in
Table 6.
V.24 signals:
Bit 1 Bit 2 Bit 3 Bit 4 Bit 5 Bit 6 Bit 7 Bit 8
1 FC RTC RTR reserved 0 reserved 0 RING DCD
Table 6: Version differences for MSC
Version
number RTC RTR
Host application ⇒ Module
RTC RTR RING DCD
Module ⇒ Host application
1 1 1
If 0 is indicated, all calls are terminated
Not used
2 DTR RTS Not used
3 DTR RTS DSR CTS RING DCD