Specifications

49 Modem AT Commands
The tables of this section list typical modem AT command sets.
Table 49-1 AT Commands with No Lead-in Character
Command Description
B, B0 ITU-T (CCITT) V.22 mode when at 1200 bps; V.21 at
300 bps
E1 Enable character echo to terminal in command mode
H, H0 Go on-hook (hang up)
N1 Connection speed set to highest possible DCE rate,
Automode
Q, Q0 Modem returns result codes (Quiet disabled)
T Tone dialing
V1 Full-word result codes (Verbose enabled)
W2 Negotiation progress codes disabled. Result code is
DCE rate
X4 Modem recognizes dialtone and busy, CONNECT
nnnn result code enabled
Y, Y0 Disable long-space disconnect
Z, Z0 Reset modem and recall User Profile 0