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Chapter 5 – AT Commands, S-Registers, and Result Codes
Multi-Tech Systems, Inc. SocketModem MT5600SMI Developer’s Guide 76
Register Unit Range Default Description
S9 0.1 s 1–255 6 Carrier Detect Response Time: Supported for backward
compatibility only. No value can be written. Responds with default
value. *
S10 0.1 s 1–255 14 Lost Carrier to Hang Up Delay: Sets the length of time, in tenths of
a second that the modem waits before hanging up after a loss of
carrier. This allows for a temporary carrier loss without causing the
local modem to disconnect. When register S10 is set to 255, the
modem functions as if a carrier is always present. *
The actual interval the modem waits before disconnecting is the value
in register S10 minus the value in register S9. Therefore, the S10
value must be greater than the S9 value or else the modem
disconnects before it recognizes the carrier.
Note: For Call Waiting detection, if the modem is set to US country
code and S10 >=16, then the modem will detect the Call Waiting tone
and hang-up the line. If S10 <16, the modem will not detect Call
Waiting tone.
S11 0.001 s 50–255 95 DTMF Tone Duration: 1. For US models, S11 sets the duration of
tones in DTMF dialing (has no effect on pulse dialing).
2. For W-class models, S11 is a country parameter. The default is
country dependent. *
S12 0.02 s 0–255 50 Escape Prompt Delay (EPD): Defines the maximum period, in
fiftieths of a second, allowed between receipt of the last character of
the three escape character sequence from the DTE and sending of
the OK result code to the DTE. If any characters are detected during
this time, the OK will not be sent. Sending of the OK result code does
not affect entry into command mode. (See 3.1.3). *
S14 138 (8Ah) General Bit-Mapped Options Status: Indicates the status of
command options.
Bit 0 This bit is ignored.
Bit 1 Command echo (En)
0 = Disabled (E0)
1 = Enabled (E1) (Default.)
Bit 2 Quiet mode (Qn)
0 = Send result codes (Q0) (Default.)
1 = Do not send result codes (Q1)
Bit 3 Result codes (Vn)
0 = Numeric (V0)
1 = Verbose (V1) (Default.)
Bit 4 Reserved
Bit 5 Tone (T)/Pulse (P)
0 = Tone (T) (Default.)
1 = Pulse (P)
Bit 6 Reserved
Bit 7 Originate/Answer
0 = Answer
1 = Originate (Default.)
S19 is supported for backward compatibility only. No value can be
written. Responds with default value.
S16 0 Test Mode Bit-Mapped Options Status: Indicates the test in
progress status.
Bit 0 Local analog loopback
0 = Disabled (Default.)
1 = Enabled (&T1)
Bits 1-7 Not used
S19 and S20 Reserved