Specifications

August 26, 2004 TechMemo 01-0011B
18 of 24
Zn
Resets modem. This works with DIP switch #7:
• Z0 — reset modem to Yn. If DIP switch #7 = UP (off), then Y0, Y1, Y2, or Y4 is selected based on the current value of Y.
If DIP switch #7 = DOWN (on), then Y3 settings are used.
• Z1 — reset modem to Y0 settings.
• Z2 — reset modem to Y1 settings.
• Z3 — reset modem to Y2 (factory generic settings). See also the &F0 command.
• Z4 — reset modem to Y3 (factory hardware settings). See also the &F1 command.
• Z5 — reset modem to Y4 (factory software settings). See also the &F2 command.
AMPERSAND (&) COMMANDS
&An
Enables/disables additional result code subsets (see Xn):
• &A0 — ARQ result codes disabled.
• &A1 — ARQ result codes enabled.
• &A2 — V.32 modulation indicator added.
• &A3 — Protocol indicators added (LAPM/MNP/NONE and V42bis/MNP5).
&Bn
Sets modem serial port rate:
• &B0 — variable: the serial port rate adapts to match the connection speed.
• &B1 — fixed: the modem always communicates with the computer at the rate which you have set regardless of the
connection speed.
&Cn
Controls Carrier Detect (CD) signal (also controlled by DIP switch #6):
• &C0 — CD signal override. Modem ignores the true status of the CD signal and responds as if it is always present. The
modem’s CD light will always be on.
• &C1 — normal operation. Modem sends CD signal when it connects with another modem.
&Dn
Controls Data Terminal Ready (DTR) signal (also controlled by DIP switch #1):
• &D0 — DTR signal override. Modem ignores the true status of the DTR signal and responds as if it is always on.
• &D1 — if DTR signal drops while in online data mode, the modem enters command mode, issues an OK, and remains
connected.
• &D2 — normal operation. If DTR signal drops while in online data mode, the modem hangs up. If the DTR signal is not
present, the modem will not answer or dial.
• &D3 — If DTR signal drops, the modem hangs up and resets as if an ATZ command were issued.
&Fn
Loads a factory setting:
• &F0 — generic.
• &F1 — hardware flow control.
• &F2 — software flow control.
&Gn
Sets guard tone:
• &G0 — no guard tone (US and Canada)
• &G1 — 550 Hz guard tone (some European countries). Requires B0 setting.
• &G2 — 1800 Hz guard tone (UK). Requires B0 setting.
&Hn
Sets Transmit Data (TD) flow control (see also &Rn):
• &H0 — flow control disabled.
• &H1 — hardware flow control: requires that your computer and software support the CTS signal.
• &H2 — software flow control: requires that your software supports XON/XOFF signaling.
• &H3 — hardware and software flow control.
&In
Sets Receive Data (RD) software flow control (see also &Rn):
• &I0 — software flow control disabled.
• &I1 — XON/XOFF signals to your modem and remote system.
• &I2 — XON/XOFF signals to your modem only.
Command Function