Specifications

Si2404
22 Rev. 0.91
+ESA Options
+ESA = A
+ESA = A,B
+ESA = A,B,C
+ESA = A,B,C,E
+ESA = A,B,C,E,F
+ESA = A,B,C,E,F,G
Synchronous access mode control options
A Specifies action taken if an underrun condition occurs during transparent sub-mode.
0 Modem transmits 8-bit SYN sequences on idle.
B Specifies action taken if an underrun condition occurs after a flag during framed sub-
mode
0 Modem transmits 8-bit HDLC flags on idle.
C Specifies action taken if an underrun or overrun condition occurs after a non-flag during
framed sub-mode.
0 Modem transmits abort on underrun in middle of frame.
1 Modem transmits flag on underrun in middle of frame and notifies host of underrun
or
overrun.
D Specifies V.34 half duplex operation.
This parameter should not be used.
E Specifies CRC polynomial used while in framed sub-mode.
0 CRC generation checking disable.
1 16-bit CRC generation and checking is performed by the modem.
F Specifies NRZI encoding and decoding.
0 NRZI encoding and decoding disabled.
G Specifies SYN.
255
Table 9. Basic AT Command Set (Command Defaults in Bold) (Continued)
Command Action