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72 MultiModemISI Hybrid Series, ISIHI-2S
Chapter 4—MODEM AT Commands, S-Registers, Result Codes
Modem
Modem Response (Result Code) Commands
ISIHI-2S modems can give responses to commands. The most common is
OK
, but the
modems also can alert you or your software to dial tones, busy signals, connection
speeds, and whether the connection is made with error correction or compression
enabled. These responses are called
result codes
; they can be terse (numbers) or
verbose (text).
E
n
Echo Command Mode Characters
n
= 0 or 1
Default: E1
Normally, when you type commands on the keyboard, the modem echoes the characters
back to the computer or terminal, which displays them on the monitor. Use the E
command to turn this feature off and on.
E0 disables the echo.
E1 enables the echo.
Q
n
Result Codes Enable/Disable
n
= 0 or 1
Default: Q0
Use the Q command to enable or disable result codes for applications such as computer-
controlled auto dialing.
Q0 (or Q) enables result codes.
Q1 disables result codes for applications such as computer-controlled auto-dialing.
V
n
Result Codes (Verbose/Terse)
n
= 0 or 1
Default: V1
The V command controls whether the modem’s result codes display as text (
verbose
) or
numeric (
terse
) messages. For example, if no carrier signal is detected after dialing, the
result can display either as NO CARRIER or as the number 3.
V0 (or V) displays the modem’s result codes as a number.
V1 displays result codes as text.
Xn Result Codes and Call Progress Selection
n
= 0, 1, 2, 3, 4, 5, 6, or 7
Default: X4
The X command selects which result codes the modem provides in command mode and
determines whether the modem uses
smart dialing
or
blind dialing
. When it smart dials,
the modem listens for dial tones and busy signals and responds to them. When it blind
dials, the modem ignores the signals and relies on timing instead.
X0 causes the modem to blind dial. Instead of looking for a dial tone, it pauses for the
time set in register S6 and then dials regardless. Once a connection is made, it sends the
Bell 103 basic code CONNECT
to the terminal. It ignores any busy signals.