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COURIER HIGH SPEED MODEMS
Alphabetical Command Summary C-9
AMPERSAND (&) COMMAND SET
&An Enable/disable additional result code subsets. See the Xn
command.
&A0 ARQ result codes are disabled.
&A1 ARQ result codes enabled.
&A2 Additional VFC, HST, or V32 modulation indicator.
&A3 Additional error control indicator (LAPM, HST, MNP,
SYNC, or NONE) and data compression type (V42BIS or
MNP5). Default.
&Bn Serial port rate variable or fixed.
&B0 Variable rates.
&B1 Fixed rate. Default. The modem always communicates
with the computer at the rate at which you have set the
terminal or software, regardless of the connection rate.
This setting is not affected by the &N setting. However,
the serial port rate must be equal to or higher than the &Nn
rate.
&B2 Fixed for ARQ calls/Variable for non-ARQ calls. Answer
mode only. When the modem goes off hook and
connects in ARQ mode, it shifts its serial port rate up to a
user-specified rate, for example, 38.4K bps. If the
connection is not under error control, the modem
behaves as if it were set to &B0 and switches its serial
port rate to match the connection rate of each call.
&Cn Carrier Detect operations. At power-on and reset, the modem
operates according to the setting of DIP switch 6. This
command is not stored in nonvolatile memory as a power-
on/reset default.
&C0 CD override, CD always ON.
&C1 Normal CD operations. The Courier sends a CD signal
when it connects with another modem and drops the CD
when it disconnects.