Table of Contents
Advertisement
PN 88300150
When Xon and Xoff commands are allowed to pass through the modem, the computer (or terminal) at the
remote site receives these commands, and depending on how it is configured, the computer (or terminal)
may respond to them also.
5.11 Normal Mode Modem Flow Control (&E10 and &E11)
When two MT2834MR's are connected in Normal mode (not using error correction), Xon/Xoff can be used
to control the flow of data between the modems. Flow control can be turned on or off with the Normal
Mode Modem Flow Control commands. When the modems are connected in Reliable mode, a different
method of modem flow control is used, and the commands for Normal Mode Modem Flow Control are
ignored.
When using Speed Conversion in Normal mode, you must activate the modem's Normal Mode Modem
Flow Control. (Speed Conversion is explained in Section 5.15.)
5.12 Hewlett Packard ENQ/ACK Pacing (&E9)
If the MT2834MR is used with Hewlett Packard (or similar) equipment that employs ENQ/ACK pacing, the
modem can be configured to respond to ENQ/ACK commands, making it compatible with HP systems.
Doing so does not effect any other flow control or pacing already configured in the modem.
When configured for ENQ/ACK, the ENQ (CTRL-E) and ACK (CTRL-F) signals from the HP equipment
will be accepted and responded to according to Hewlett Packard protocol.
5.13 Compression, Error Correction, Flow Control, Pass Through and Pacing
Commands
The MT2834MR has a variety of commands to control its error correction and data compression options.
These commands are listed below. (Remember to precede each command with the AT characters.)
Normal/Auto-Reliable/Reliable Mode Commands:
&E0 =
Normal Mode (prevents any error correction mode)
&E1 =
Auto-Reliable Mode* (enables MNP or LAP-M mode)
&E2 =
Reliable Mode (MNP or LAP-M mode only)
Modem-Initiated Flow Control Commands:
&E3 =
Disables flow control (no flow control)
&E4 =
Hardware flow control (CTS on/off and RTS on/off)*
&E5 =
Xon/Xoff flow control
Xon/Xoff Pass-Through Commands:
&E6 =
Modem responds to Xon/Xoff characters, but does not allow Xon/Xoff characters to pass
through to remote site.*
&E7 =
Modem responds to Xon/Xoff characters, and allows them to pass through to remote site.
Enq/Ack Pacing Commands:
&E8 =
Enq/Ack method of pacing off*
&E9 =
Enq/Ack method of pacing on
Normal Mode Modem Flow Control Commands:
&E10 =
Normal Mode Modem Flow Control off*
4/3/01
51
Advertisement
Table of Contents
