Ositech comm Trumpcard Data/Fax Modem - Manual (Page 55)

User’s Guide and Reference 4 - 23
Modem Command Reference
Examples
AT&Q0 Selects asynchronous operation in the Direct mode.
In this mode, the communications software speed
must match the telco line speed.
AT&Q4 Selects AutoSync operation. Is used in conjunction
with communications software that is compatible
with the Hayes Synchronous Interface (HSI).
AT&Q5 Selects error correction mode. Modem negotiates
an error-correction link. The modem can be
configured to either disconnect or fallback to a
normal asynchronous connection if the link cannot
be negotiated (refer to register S36).
&Q5 and S36=0 Same as \N2 command (no
fallback)
&Q5 and S36=1 Same as \N3 command (fallback)
AT&Q6 Selects asynchronous operation in Normal mode
(Speed Buffering). In this mode, the communications
software speed can differ from the telco line speed.
&Rn — RTS/CTS Option
Parameters 0 or 1
Default 0
Controls the state of the Clear To Send (/CTS) signal operation, this can
be altered if hardware flow control is enabled. (see &K command).
Examples
AT&R0 CTS acts according to V.25bis handshake (i.e. /CTS
tracks /RTS [Request To Send])
AT&R1 The modem ignores /RTS;/CTS is always ON
&Sn — DSR Option
Parameters 0 or 1
Default 0
Determines whether Data Set Ready (/DSR) operates in accordance with
EIA-232-D specification or remains ON.
Examples
AT&S0 DSR is always ON
AT&S1 DSR is turned ON at start of handshaking and OFF
when carrier is lost