Multiplexer User's Guide
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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):
| Command |
| Length |
| 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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| (optional) | ||||
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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 |
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| 1 |
| C/R |
| 0 | 0 |
| 0 |
| 1 | 1 |
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| 1 |
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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 |
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Version |
| RTC |
| RTR |
| RTC | RTR RING | DCD | |||||
number |
| Host application ⇒ Module |
| Module ⇒ Host application | |||||||||
1 |
| 1 |
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| 1 |
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| Not used |
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| If 0 is indicated, all calls are terminated |
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2 |
| DTR |
| RTS |
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| Not used |
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3 |
| DTR |
| RTS |
| DSR | CTS RING | DCD | |||||
Mux_guide_v06 | Page 34 of 36 | 30.06.2004 |