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Modem Status Command (Msc); Figure 11: Modem Status Command (Msc) - Siemens Mux_guide_v06 User Manual

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Multiplexer User's Guide
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4.3.9 Modem status command (MSC)

The Modem Status Command is used for software flow control.
d
Length
Comman
1 octet
1 octet
Command:
Bit 1
Bit 2
1
C/R
C/R bit: Indicates whether the sequence is a command or a response.
Length: Length = 2 , EA-Bit = 1
DLCI:
Bit 1
Bit 2
1
1
V.24 signals:
Bit 1
Bit 2
1
FC
FC bit: Flow control, included in all multiplexer versions
FC = 1: no frames are accepted
The following bits for V24 status lines as described in this chapter are included in multiplexer
protocol version 3 only. However, if you wish to use the advantages of this version it is
absolutely necessary to switch on the version 3, otherwise version 1 will be used, see
Chapter 5.2.
Direction host application" module (for request only) MUX V3:
RTC: mapped to DTR
RTR: mapped to RTS
Bit 5, 6, 7, 8 are not valid.
Direction module " host application (for request only) MUX V3:
RTC: mapped to DSR
RTR: mapped to CTS
RING: mapped to RING
DCD: mapped to DCD
Bit 5, 6 are not valid
Mux_guide_v06
DLCI
1 octet
Bit 3
Bit 4
0
0

Figure 11: Modem status command (MSC)

Bit 3
Bit 4
Bit 3
Bit 4
RTC
RTR
Page 28 of 36
V.24 signals
1 octet
Bit 5
Bit 6
0
1
Bit 5
Bit 6
DLCI
Bit 5
Bit 6
reserved 0 reserved 0 RING
s
m
o b i l e
Break Signals
(optional)
1 octet
Bit 7
Bit 8
1
1
Bit 7
Bit 8
Bit 7
Bit 8
DCD
30.06.2004

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