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APPENDIX D: QUICK-REFERENCE SUMMARIES
DEFINITY Communications System
7400B Data Module
Page D-2
User’s Guide
Command
Description
AT
Command prefix—precedes most commands.
A
Go off hook and remain in command state.
A/
Repeat the last command line.
D
Enter originate mode and dial number that follows.
E0
Inhibit command state echo.
E1
Enable command state echo.
H0
Go on-hook (hang up).
H1
Accepted but causes no action.
I0
Returns decimal number 249 to data terminal.
I1
Returns ROM checksum as two 4-digit hexadecimal numbers.
I2
Returns OK.
O
Return to on-line mode.
Q0
Enable display of result codes.
Q1
Disable display of result codes.
S
r Set pointer to S-register r.
S
r=n
Set S-register r to value n.
S
r
?
Display value stored in S-register r.
V0 Display short form (numeric) result codes.
V1
Display verbose form (text) result codes.
X1
Enables features of result codes 0-4.
X2
Enables features of result codes 0-5, 10-12, 14.
X3
Enables features of result codes 0-6, 10-12, 14.
X4
Enables features of result codes 0-7, 10-12, 14.
Z0
Reset and recall stored configuration profile 0.
Z1
Reset and recall stored configuration profile 1.
(more)
TABLE D-1 AT COMMAND SET