Westermo TD-22 - Manual (Page 24)

25 6177-2203
Qn – Quiet Results Codes Control
The command enables or disables the sending of result codes to the DTE according to the parameter
supplied. The parameter value, if valid, is written to S14 bit 2.
Q0 Enables result codes to the DTE. (Default.)
Q1 Disables result codes to the DTE.
Please also refer to ATV, ATE
&Qn – Asynchronous/Synchronous Mode
This command is used to control the connection modes permitted. It is used in conjunction with S36
and S48. (Also, see \N.) When the &Q0 to &Q4 command is issued to select the mode, the subsequent
connect message will report the DCE speed regardless of the W command and S95 settings.
&Q0 Selects direct asynchronous operation (&M0).
&Q1 Selects synchronous operation and asynchronous commands (&M1).
&Q2 Selects synchronous operation and asynchronous commands (&M2)
&Q3 Selects synchronous operation with DTR as ”VOICE/DATA” switch (&M3)
&Q4 Selects AutoSync operation. The value 100b is written to S27 bits 3, 1, and 0,
respectively.
AutoSync operation, when used in conjunction with the Hayes Synchronous Interface
(HSI) capability in the DTE, provides synchronous communication capability from an
asynchronous terminal.
Starting AutoSync. Set registers S19, S20, and S25 to the desired values before
selecting AutoSync operation with &Q4. After the CONNECT message is issued, the
modem waits the period of time specified by S25 before examining DTR. If DTR is on,
the modem enters the synchronous operating state; if DTR is off, the modem terminates
the line connection and returns to the command state.
Stopping AutoSync. AutoSync operation is stopped upon loss of carrier or the on-to-
off transition of DTR. Loss of carrier will cause the modem to return to the command
state. An on-to-off transition of DTR will cause the modem to return to the command
state and either not terminate the line connection (&D1 active) or terminate the line
connection (any other &Dn command active).
&Q5 The modem will try to negotiate an error-corrected link. The modem can be configured
using S36 to determine whether a failure will result in the modem returning on-hook or
will result in fallback to an connection. The value 101b is written to S27 bits 3, 1, and
0, respectively. (Default.)
&Q6 Selects asynchronous operation in normal mode (speed buffering). The value 110b is
written to S27 bits 3, 1, and 0, respectively.
%Q – Line Signal Quality
Reports the line signal quality at V.22 and V.22bis. Returns the higher order byte of the EQM value.
Based on the EQM value, retrain or fallback/fall forward may be initiated if enabled by %E1.
A low value is good.
Please also refer to AT%L