Control Microsystems 5901 - Rn - RTS;CTS Option; Sn - DSR Override; Tn - Local Analog Loopback Test

5901 High Speed Dialup Modem Hardware Manual
October 19, 2007
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&Q2 Selects synchronous connect mode with async off-line command mode and enables DTR
dialing of directory 0. The value 010b is written to S27 bits 3, 1, and 0, respectively. See
&M2. (Serial interface operation only.)
&Q3 Selects synchronous connect mode with async off-line command mode and enables DTR to
act as Talk/Data switch. The value 011b is written to S27 bits 3, 1, and 0, respectively. See
&M3. (Serial interface operation only.)
&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 asynchronous 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.
Result Codes:
OK n = 0 to 6.
ERROR Otherwise.
10.3.10 &Rn - RTS/CTS Option
This selects how the modem controls CTS. CTS operation is modified if hardware flow control is
selected (see &K command). The parameter value, if valid, is written to S21 bit 2.
&R0 In sync mode, CTS tracks the state of RTS; the RTS-to-CTS delay is defined by S26. In
async mode, CTS is normally ON and will turn OFF only if required by flow control.
&R1 In sync mode, CTS is always ON (RTS transitions are ignored); In async mode, CTS is
normally ON and will turn OFF only if required by flow control.
Result Codes:
OK n = 0 or 1.
ERROR Otherwise.
10.3.11 &Sn - DSR Override
This command selects how the modem will control DSR. The parameter value, if valid, is written to
S21 bit 6.
&S0 DSR will remain ON at all times. (Default.)
&S1 DSR will become active after answer tone has been detected and inactive after the carrier
has been lost.
Result Codes:
OK n = 0 or 1.
ERROR Otherwise.
10.3.12 &Tn – Local Analog Loopback Test
The modem will perform the local analog loopback test if &T1 is selected. The test can be run only
when in an asynchronous operation in non-error-correction-mode (normal). To terminate the test in
progress, the escape sequence must be entered first.