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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 
= 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 
= 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 
= 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 
= 0 or 1.
ERROR
Returned for any other value of 
n
.