4-7
Issue 3 April 1994
Table 4-1. AT Command and S-Register Reference (6 of 27)
AT
Command
or
S-Register
Description
X
n
(continued
from
previous
page)
Extended Result Codes, Dial Tone Detect, Busy Tone
Detect
X0
Disables extended result codes 5 –16, dial tone
detect, and busy tone detect
. See above note
concerning blind dialing.
X1
Enables extended result codes 5 –16, disables
dial tone detect and busy tone detect
. See
above note concerning blind dialing.
X2
Enables extended result codes 5 –16 and dial
tone detect, disables busy tone detect
.
X3
Enables extended result codes 5 –16, disables
dial tone detect, enables busy tone detect
.
See above note concerning blind dialing.
X4
Enables extended result codes 5 –16, dial
tone detect, and busy tone detect
.
X5
Adds error control suffix (REL) to extended
result codes 20 –27 if error control is used,
enables dial tone detect and busy tone detect.
X6
Adds either V.42 or MNP suffix to extended
result codes 20 –27 if data compression is used,
enabled dial tone detect and busy tone detect.
X7
Computer’s data rate appears in the Connect
message instead of the telephone line data rate,
enables dial tone detect and busy tone detect.