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.
Command |
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| DLCI |
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| V.24 signals |
| Break Signals | |||
1 octet |
| 1 octet |
| 1 octet |
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| 1 octet |
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| 1 octet | ||||||
Command: |
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Bit 1 | Bit 2 |
| Bit 3 | Bit 4 | Bit 5 |
| Bit 6 | Bit 7 |
| Bit 8 | ||
1 | C/R |
| 0 | 0 |
| 0 |
| 1 | 1 |
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Figure 11: 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 | Bit 2 | Bit 3 | Bit 4 | Bit 5 |
| Bit 6 | Bit 7 | Bit 8 |
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1 | 1 |
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V.24 signals:
Bit 1 |
| Bit 2 | Bit 3 | Bit 4 |
| Bit 5 | Bit 6 | Bit 7 | Bit 8 |
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1 |
| FC | RTC | RTR |
| reserved 0 | reserved 0 | RING | DCD |
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FC bit: | Flow control, included in all multiplexer versions |
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FC = 1: | no frames are accepted |
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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 | Page 28 of 36 | 30.06.2004 |