Multi-Tech Systems MT3334HD8 manual Flow Control Commands

MT3334HD8 User Guide

L8 List Online Diagnostics

Default: none

The L8 command displays the modem’s online status. You can print this display and use it as a modem status report or as diagnostic information (such as when calling Technical Support).

If you type +++ATL8 with the modem online, the current online status will be displayed. If you type ATL8 with the modem in command mode, the most recent online status will be displayed. If you type ATL8 immediately after modem power-up, the message NO INFORMATION AVAILABLE will be displayed.

To enter this command while online, type +++ATL8<CR>. Your modem’s online status will be displayed, listing current operating conditions such as link type, line speed, serial speed, line quality, and reason for last disconnect.

&RN Rate Renegotiation

Default: none

The &RN command forces the modem to perform a rate renegotiation while online. To issue it, you must first escape to command mode by issuing the +++AT<CR> command.

&RR Retrain

Default: None

The &RR command forces the modem to perform an immediate retrain while online. To issue it, you must first escape to command mode by issuing the +++AT<CR> command.

Flow Control Commands

Flow control refers to the techniques used by data terminal equipment and the MT3334HD8 to pause and resume the flow of information between them. It prevents a device from accepting more data than it can handle. The MT3334HD8 implements flow control in both directions. When the MT3334HD8 halts the flow of data, it is called flow control, and when the computer halts the flow, it is called pacing.

&BSn Maximum Reliable Block Size

n = 0 or 1 Default: &BS1

When the modem is in reliable mode, use the &BS command to set the maximum size of a data block. MNP Class 3 sends a 64-character block, while Classes 4 and 5 normally send blocks of 256 characters or less. Reducing the block size for MNP 4 and 5 may improve overall throughput when phone lines are noisy; however, it also could slow data transfer if line quality is good.

&BS0 sets the maximum transmit block size to 64 characters.

&BS1 sets the maximum transmit block size to 256 characters.

$EBn Asynchronous Word Length

n = 0 or 1 Default: $EB0

The MT3334HD8 can operate with either a 10-bit format (one start bit, seven data bits, one parity bit, and one stop bit) or an 11-bit format (one start bit, eight data bits, one parity bit, and one stop bit) in both command and online modes.

36 CommPlete Communications Server