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TC3x Multiplexer User's Guide
8.3.6.2 Test command (Test)
The test command is intended to test the connection between MS and TE.
Type field:
Bit 1
1
The length byte indicates the number of test bytes sent in the value bytes. The responding station
should respond with precisely the same bit sequence. The test command is used for the version con-
trol. See also chapter 9 for detailed information.
8.3.6.3 Modem status command (MSC)
The Modem Status Command is used for software flow control.
Command
1 octet
Command:
Bit 1
1
Figure 23: Modem status command (MSC)
C/R bit: Indicates whether the sequence is a command or a response.
Length:
Length = 2 , EA-Bit = 1
DLCI:
Bit 1
1
V.24 signals:
Bit 1
1
FC bit:
Flow control
FC = 1:
no frames are accepted
RTC: mapped to DTR
RTR: mapped to RTS
Note:
RTC/RTR are valid in the direction host à module only!
RTC/RTR are NOT valid in the direction module à host!
Break signal (optional):
Bit 1
1
The break signal octet normally carries information about a break condition detected from the host in
the data stream for the DLC.
TC3x_UG_01_V03.10 - Released
Bit 2
Bit 3
Bit 4
C/R
0
0
Length
1 octet
Bit 2
Bit 3
Bit 4
C/R
0
0
Bit 2
Bit 3
Bit 4
1
DLCI
Bit 2
Bit 3
Bit 4
FC
RTC
not
support
ed
Bit 2
Bit 3
Bit 4
Page 40/50
Bit 5
Bit 6
0
1
DLCI
V.24 signals
1 octet
1 octet
Bit 5
Bit 6
0
1
Bit 5
Bit 6
Bit 5
Bit 6
reserve
reserve
d 0
d 0
Bit 5
Bit 6
Not supported
Bit 7
Bit 8
0
0
Bit 7
Bit 8
1
1
Bit 7
Bit 8
Bit 7
Bit 8
not
not
support
support
ed
ed
Bit 7
Bit 8
10.01.2002
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