USRobotics V.34 user manual Ampersand & Command SET

COURIER HIGH SPEED MODEMS

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.

Alphabetical Command Summary C-9