AT Commands, S-Registers, and Result Codes
S-Registers
S-registers are sections of memory in which values are stored that affect how the TA operates. S-registers are so-called because each has a name that begins with the character S. Use the Sr=n command to assign a value to an S-register or use the Sr? command to read the current value of an S-register. S- registers are stored in non-volatile RAM (NVRAM) by using the &W0 command. ATZ<CR> restores S- registers to values stored in NVRAM if any were stored using the &W0 command, otherwise they revert to factory default settings in ROM. Table 4-2 summarizes the available S-registers and their function.
See the additional documents on this CD for more information on each S register.
S-Register Summary
S-Register | Function |
S0 | Rings Until Answer |
S1 | Ring Count |
S2 | Escape Character |
S3 | Carriage Return Character |
S4 | Line Feed Character |
S5 | Backspace Character |
S7 | Wait for Connection (Abort Timer) |
S8 | Pause Time for Comma |
S10 | DCD Drop Time |
S25 | DTR Drop Time |
S26 | Delay DTR Monitoring After Connect |
S27 | RS-232 CLEAR Synchronization Sequence |
S29 | On-line Inactivity Timer Period |
S30 | On-line Inactivity Timer |
S31 | Maximum Re-dial Timeout Value |
S32 | Escape Sequence Timeout |
S34 | Maximum Escape Sequence Length |
S44 | POTS Port Ring Frequency |
S45 | Use Dial Tone From Central Office |
S46 | Pulse-Dial Recognition |
S49 | POTS Port Dial Tone Gain |
S50 | Caller Line ID (CLI) |
S51 | POTS Port Dial Tone Suppression |
S52 | Auto-Protocol Detection |
S53 | Maximum X.75 Buffer Size |
S54 | Force 56Kbps B-Channel Data Rate |
S55 | Information Transfer Capability for POTS Port Calls |
S56 | Calling Party Number Information Element Settings |
S57 | Called Party Number Information Element Settings |
S58 | Client-side PPP/ML-PPP Authentication Protocol Negotiation |
S59 | Dynamic Bandwidth Allocation (DBA) Scheme |
S60 | Bandwidth-On-Demand (BOD) High Threshold Sampling Period |
S61 | Bandwidth-On-Demand (BOD) High Throughput Threshold |
S62 | Bandwidth-On-Demand (BOD) Low Threshold Sampling Period |