Appendix F 107
&M
n
Select Sync, Async or AutoSync Mode Options
Selects the communication mode.
* &M0: Async mode.
&M1: Sync mode 1. Async off-line and Sync on-line. To switch to on-line command mode, select
&D1 and drop DTR.
&M2: Sync mode 2. Autodial stored #0 when DTR changes from off to on, ignore &D option,
always &D2 when DTR changes from off to on.
&M3: Sync mode 3. Manual dial mode with talk/data switch, same as &M2 when in on-line mode.
&M4: Hayes AutoSync mode.
Result Codes:
OK Returned when
n
= 0, 1, 2, 3 or 4.
ERROR Returned for any other value of
n
.
&P
n
Dial Pulse Ratio
Determines the make/break ratio used during pulse dialing.
* &P0: Make = 39%; Break = 61%; for use in the United States.
&P1: Make = 33%; Break = 67%; for use in some other countries.
Result Codes:
OK Returned when
n
= 0 or 1.
ERROR Returned for any other value of
n
.
&Q
n
Communications Mode Option
Selects the communication mode. This is the Hayes command, and performs identically to &M
n
, above.
Result Codes:
OK Returned when
n
= 0, 1, 2, 3 or 4.
ERROR Returned for any other value of
n
.
&R
n
CTS/RTS Option (non-CTS Flow Control Mode)
Defines the functions of CTS.
* &R0: CTS follows RTS (Synchronous modes only).
&R1: CTS always true.
Result Codes:
OK Returned when
n
= 0 or 1.
ERROR Returned for any other value of
n
.