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Appendix C
S Registers
| S0 | 0- | 0 | Number of rings to auto-answer |
| S1 | 0-255 | 0 | Counts incoming rings |
| S2 | 0-255 ASCII | 43 | Escape character |
| S3 | 0-127 ASCII | 13 | Carriage return character |
| S4 | 0-127 ASCII | 10 | Line feed character |
| S5 | 0-255 ASCII | 8 | Backspace character |
| S6 | 2-255 seconds | 2 | Dial tone wait time before blind dialing |
| S7 | 1-255 seconds | 50 | Remote carrier wait time |
| S8 | 0-255 seconds | 2 | Comma pause time |
| S9 | 1-255 100 ms | 6 | Carrier detect response time |
| S10 | 1-255 100 ms | 14 | Delay between carrier loss and hang up |
| S11 | 50-255 1 ms | 95 | Tone duration in DTMF dialing |
| S12 | 0-255 20 ms | 50 | Escape code guard time |
| S13 | RESERVED | ||
| S14 | BIT MAPPED OPTIONS | ||
| S15 | RESERVED | ||
| S16 | RESERVED | ||
| S18 | 0-255 seconds | 0 | Modem test timer |
| S19-20 | RESERVED | ||
| S21 | V.24 BIT MAPPED OPTIONS | ||
| S22 | SPEAKER BIT MAPPED OPTIONS | ||
| S23 | BIT MAPPED OPTIONS |
| S24 | 0-255 seconds | 0 | Sleep inactivity timer |
| S25 | 0-255 10 ms | 5 | Data Terminal Ready delay |
| S26 | 0-255 10 ms | 1 | RTS-to-CTS |
| S27 | BIT MAPPED OPTIONS | ||
| S28 | BIT MAPPED OPTIONS | ||
| S29 | 0-255 10 ms | 70 | Flash dial modifier time |
| S30 | 0-255 10 seconds | 0 | Inactivity time before hang up |
| S31 | BIT MAPPED OPTIONS | ||
| S32 | 0-255 ASCII | 17 | XON character |
| S33 | 0-255 ASCII | 19 | XOFF character |
| S34-35 | RESERVED | ||
| S36 | 0, 3, 4, 7 | 7 | LAPM failure control |
| 0 | Modem disconnects | ||
| 3 | Modem stays on line and establishes a Normal mode (speed buffering) connection. | ||
| 4 | Attempts MNP connection: if fails, disconnects | ||
| 7 | Attempts MNP connection: if fails, establishes a Normal mode (speed buffering) connection. | ||
| S37 | 0-12 | 0 | Desired DTE connection speed |
| 0 | Attempt automode connection (F0) | ||
| 1-3 | Attempt to connect at 300 bps (F1) | ||
| 4 | Reserved | ||
| 5 | Attempt to connect at 1200 bps (F4) | ||
| 6 | Attempt to connect at 2400 bps (F5) | ||
| 7 | Attempt to connect at 75 bps send/1200 bps receive V.23 (F3) | ||
| 8 | Attempt to connect at 4800 bps (F6) | ||
| 9 | Attempt to connect at 9600 bps (F8) |
| S37 | 10 | Attempt to connect at 12000 bps (F9) | |
| 11 | Attempt to connect at 14000 bps (F10) | ||
| 12 | Attempt to connect at 7200 bps (F7) | ||
| S38 | 0-255 seconds | 20 | Delay before forced disconnect |
| S39 | 0-6 | 3 | FLOW CONTROL |
| 0 | No flow control | ||
| 3 | RTS/CTS (&K3) | ||
| 4 | XON/XOFF | ||
| 5 | Transparent XON (&K5) | ||
| 6 | Both methods (&K6) | ||
| S40-41 | BIT MAPPED OPTIONS | ||
| S42-45 | RESERVED | ||
| S46 | 136 or 138 | 138 | Data compression selection |
| 136 | Error correction with no compression | ||
| 138 | Error correction and compression | ||
| S48 | 0, 7, or 128 | 7 | V.42 negotiation action |
| 0 | No negotiation: bypass detection and negotiation phases: proceed with LAPM | ||
| 7 | Negotiation | ||
| 128 | No negotiation: bvDass detection and negotiation phases: proceed with S36 fallback action. | ||
| S80 | RESERVED | ||
| S82 | 3, 7, or 128 | 128 | Break handling options |
| 3 | Break immediate: data integrity maintained ahead of and after break. | ||
| 7 | Break immediate: data at time of break destroyed. | ||
| 128 | Break in sequence with any transmitted data: data maintained ahead of and after break |
| S86 | 0, 4, 5, 6, 7, 8, 9,10, 11.12.13.14 | none | Call failure reason code |
| 0 | Normal disconnect, no error | ||
| 4 | Loss of carrier | ||
| 5 | V.42 negotiation failed to detect error correction modem at remote end | ||
| 6 | No response to feature negotiation | ||
| 7 | This modem is asynch only: remote modem is synch only | ||
| 8 | No framing technique in common | ||
| 9 | Modems could not find a common protocol | ||
| 10 | Bad response to feature negotiation | ||
| 11 | No synch information from remote modem | ||
| 12 | Remote modem initiated a normal disconnect | ||
| 13 | Remote modem does not respond after 10 message re-transmissions | ||
| 14 | Protocol violation | ||
| S95 | Add numbers below for desired messages: | 44 | Extended result codes |
| 0 | CONNECT gives computer-to- modem (DTE) speed | ||
| 1 | CONNECT gives DCE speed | ||
| 2 | /ARO after CONNECT if error correction is active | ||
| 4 | CARRIER message | ||
| 8 | PROTOCOL message | ||
| 32 | COMPRESSION message | ||
| 44 | CARRIER. PROTOCOL. and CONNECT (DTE) |
