US Robotics 56K USB Modem User Manual page 49

+ESA=<trans_idle>,<frame_idle>,<framed_un_ov>,<hd_auto>,<crc_type>,<nrz
i_en>,<syn1>—Set Up Error Control Parameters
Use this command to set the control parameters for the DCE in synchronous access mode (see page 11).
USRobotics host-based modems do not use the <framed_un_ov>, <hd_auto>, and <syn1> parameters.
Result codes:
• OK if <trans_idle> = 0 and <frame_idle> = 0 and <crc_type> = 0, 1 and <nrzi_en> = 0.
• ERROR if <trans_idle> = 0 or <frame_idle> = 0 or <crc_type> = 0, 1 or <nrzi_en> = 0.
Table 85. +ESA Commands
Command
+ESA=0,,,,0,0,,
+ESA=0,,,,1,0,,
Table 86. Valid <crc_type> Values
Value
0 Disables CRC generation and checking.
1 In framed submode, the 16-bit CRC specified in V.42 is generated by the DCE in
the transmit direction and checked by the DCE in the receive direction.
+ESR=<value>—Selective Repeat
USRobotics controller-based modems products do not use the selective reject mode. This command
initiates the selective reject mode, and only the +ESR=0
Result codes:
• OK if <value> = 0.
ERROR if <value> ≠ 0.
•
Table 87. +ESR Extended Syntax Commands
Command
+ESR=<value>
+ESR?
+ESR=?
1. ITU-T Recommendation V.250 (05/98) standardized this command. For further details on the standard version of this command,
see Recommendation V.250.
Disables CRC generation and checking.
Causes the DCE to generate a 16-bit CRC in the transmit direction in framed
sub-mode and check the CRC in the receive direction.
Enables or disables the selective reject mode.
Displays the current settings for the selective reject mode.
Displays the supported settings for the selective reject mode.
Meaning
Meaning
1
form of this command is supported.
Description
56K USB Modem
User Guide
Command Reference - 43