Hardware manual

5901 High Speed Dialup Modem Hardware Manual

October 19, 2007

&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.