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A-28 Configuration Quick Reference
Configuration
Quick-Reference
AT
*
RE5 =FP/108.ACU With this option, off-to-on transitions of this signal from the DTE activate the ACU. This lets
the modem accept dial commands. With this option, either modem can enable the ACU when
the connected DTE turns Circuit 116 from off to on.
AT
*
RE6 =FP/116.ACU With this option, off-to-on transitions of this signal from the DTE activate the ACU. This lets
the modem accept dial commands to initiate restoral. With this option, either modem can
enable the ACU when the connected DTE turns Circuit 116 from off to on.
Parity
Parity
When using the ASCII character set, you must select the parity used by the modem and DTE.
The Parity option applies to asynchronous and character-synchronous data formats.
When set to V.25, the following applies:
Async
: 7 Data Bits, Parity=even, Stop Bits=1
Bitsync
: 7 Data Bits, Parity=space, Stop Bits=1
or
8 Data Bits, Parity=none, Stop Bits=1
AT
*
RP0 =V.25
Charsync
: 7 Data Bits, Parity=odd, Stop Bits=1
AT
*
RP1 =Even 7 Data Bits, Parity=even, Stop Bits=1
AT
*
RP2 Parity=Odd 7 Data Bits, Parity=odd, Stop Bits=1
AT
*
RP3 =Mark 7 Data Bits, Parity=mark, Stop Bits=1
or
7 Data Bits, Parity=none, Stop Bits=2
AT
*
RP4 =Space 7 Data Bits, Parity=space, Stop Bits=1
or
8 Data Bits, Parity=none, Stop Bits=1
RTS
RTS Control
The AT
*
RS command determines how the modem interprets the RTS signal. The DTE
signals the modem with RTS on EIA/TIA 232-D Pin 4 (V.24 Circuit 105).
AT
*
RS0 =Normal The DTE controls data transmission with RTS.
AT
*
RS1 =High The modem sets RTS high. Use this setting if the DTE does not provide RTS. If you are using
Normal or Reliable data transfer mode and you are using RTS/CTS flow control, this setting is
overridden and RTS operates as if RTS=Normal.
AT
*
RS2 =Remote This setting applies to simulated half-duplex applications and works only if the remote modem
also supports RTS/DCD signaling. For this application to work properly, the DCD option at the
remote site must be set to Remote. Coordinate your setting with the remote site.
Retrain
Auto Retrain
Enables the auto-retrain feature. When enabled, the modem retrains if the specified bit error
rate is exceeded. Enable Retrain for most applications because retrains allow the modem to
compensate for changing line conditions.
AT
*
RT0 =Off The modem does not automatically initiate retrains, but responds to retrains from the remote
modem.
AT
*
RTl =Low BER The Low BER setting is more sensitive than the High BER setting.
Using V.34, V.32bis, V.32, or V.32 Uncoded, the modem retrains when the bit error rate (BER)
exceeds approximately 10
-4
for eight seconds.
Using V.22bis, the modem retrains when the bit error rate (BER) exceeds approximately 10
-4
for one second.
Table A-1.
AT Commands, Cross-Referenced to Front Panel Options (Continued)
AT
Command
Parameter &
Option Description
Gray shading indicates country-specific options. See Appendix C for your country’s options.