Appendix A AT Commands
51
+ER Control Reporting Commands:
+ER=0 This command enables error control report (default).
+ER=1 This command disables error control report.
+ER Error Control Reporting Intermediate Result Codes
+ER: NONE Data compression not in use.
+ER: LAPM V.42 LAPM protocol is in use.
+ER: ALT V.42 alternative protocol is in use.
+ES=
<orig
_rqst
>
,<o
rig_fbk
>,<ans
_fbk>—E
rror C
o
ntro
l Sele
ction
Use this command to select the error correction mode. If the modem is
operated in V.80 mode (synchronous buffered mode), and +ES=,,8, the +ES?
will always return +ES: 6,,8. The setting of this command overwrites the \N
command. However, the +ES command is overwritten by the setting on a \N
command.
+ES Combinations:
+ES=1,0,1 Buffered mode.
+ES=0,1,0 Direct mode.
+ES=4,4,6 MNP or disconnect mode.
+ES=3,3,5 LAPM or disconnect mode.
+ES=4,0,6 MNP or buffered mode.
+ES=3,0,2 LAPM, MNP, or buffered mode (default).
+ES=2,0,2 LAPM or buffered mode.
+ES=3,2,4 LAPM, MNP, or disconnect mode.
+ES=,,8 V.42 sync buffer mode (V.80 enabled).
+ES=6,,8 V.42 sync buffer mode (V.80 enabled).
+ESR=<value>—Selective Repeat
Use this command to enable or disable the selective reject mode.
0 Enables the selective reject mode.
1 Disables the selective reject mode.
