AT&FS0=1<cr> AT&FS0=1<cr>
AT+A8E=6,5,,,,"1"<cr> AT+A8E=6,5,,,,"1"<cr><cr><lf>OK<cr><lf>
<cr><lf>RING<cr><lf>
<cr><lf>+A8I: C1<cr><lf>
<cr><lf>+A8M: C145000026<cr><lf>
<cr><lf>+A8J: 1<cr><lf>
<cr><lf>CONNECT 57600<cr><lf>
3.2.8 Synchronous Access Mode Commands
+ESA - Configure Synchronous Access Mode
This extended-format compound parameter controls the manner of operation of the
Synchronous Access Mode in the modem.
Enabling Synchronous Access Mode enables the use of the 8-bit command characters defined
in Table 9/V.80 of the Draft ITU-T
Recommendation
V.80 (DATA COMMUNICATION
OVER THE TELEPHONE NETWORK; In-Band modem Control and Synchronous Data
Modes for Asynchronous DTE).
Syntax
+ESA=[<trans_idle>[,<framed_idle>[,<framed_un_ov>[,<hd_auto>[,<crc_type>
[,<nrzi_en>[,<syn1>[,<syn2>]]]]]]]]
Defined Values
<trans_idle> Decimal number which specifies the bit sequence transmitted by
the modem when a transmit data buffer underrun condition occurs,
while operating in Transparent sub-Mode. The options are:
0 In Transparent sub-Mode, modem transmits 8-bit
SYN sequence on idle. Modem receiver does not
hunt for synchronization sequence (default and fixed).
<framed_idle> Decimal number which specifies the bit sequence transmitted by
the modem when a transmit data buffer underrun condition occurs
immediately after a flag, while operating in Framed sub-Mode. The options are:
0 In Framed sub-Mode, modem transmits HDLC flags
on idle (default and fixed).
<framed_un_ov> Decimal number which specifies the actions undertaken by the
modem when a transmit data buffer underrun or overrun condition
occurs immediately after a non-flag octet, while operating in Framed sub-Mode.
0 In Framed sub-Mode, modem transmits abort on underrun in middle of frame. (Default.)
1 In Framed sub-Mode, modem transmits a flag on
underrun in middle of frame, and notifies DTE of underrun or overrun.
<hd_auto> Decimal number which specifies whether or not, in V.34 halfduplex
operation, additional procedures besides those specified in
§ 12/V.34 will be performed by the modem when switching from
primary channel to secondary channel operation, and vice versa.
This subparameter should not be commanded.
<crc_type> Decimal number which specifies the CRC polynomial used while
operating in Framed sub-Mode. The options are:
0 CRC generation and checking disabled. (Default and fixed.)
<nrzi_en> Decimal number which specifies if Non Return to Zero Inverted
(NRZI) encoding is to be used by the modem for transmit and receive data. The options are:
0 NZRI encoding and decoding disabled (default and fixed).
<syn1>, <syn2> Decimal number which specifies the octet value(s) to be used
while performing character-oriented framing. <syn1> is to be
commanded to 255 (FFh); <syn2> is not to be commanded.
Reporting Current or Selected Values
Command: +ESA?
Response: +ESA:
<trans_idle>,<framed_idle>,<framed_un_ov
>,<hd_auto>,<crc_type>,<nrzi_en>,<syn1>, <syn2>
