Perle Systems 833IS - Manual (Page 274)

AT Commands
258 Perle 833IS User Guide
lowest and highest rates (see and below).
is an optional numeric value which enables or disables automatic
modulation negotiation using V.8 bis/V.8 or V.32 bis Annex A. The options are:
The default value is 1, which enables automode. Note, however, there are
modulations for which there is no automatic negotiation, e.g., Bell 212 ( =
69).
For = 0 (automode disabled, i.e., fixed modulation):
a. If is within the rates supported by the selected modulation, the
selected rate is that specified by . For example:
+MS=10,0,1200,4800 selects V.32 bis 4800 bps fixed rate.
b. If is greater than the highest speed supported by the modulation
specified by , the starting rate is the highest rate supported by the
selected modulation. For example:
+MS=10,0,2400,14400 selects V.32 bis 14400, 12000, 9600, 7200, or 4800 bps.
c. To select fixed mode operation, specify the and both
to be the (same) requested speed, and to be the modulation for that
speed. For example:
+MS=11,0,16800,16800 selects V.34 16800 bps fixed mode
+MS=10,0,12000,12000 selects V.32 bis 12000 bps fixed mode
For = 1 (automode enabled, i.e., automatically selected speed and
modulation):
The modem connects at the highest possible rate in accordance with V.8 bis/
V.8, or V.32 bis Annex A if V.8 bis/V.8 is not supported by the remote modem.
d. If is greater than the highest rate supported by the modulation
specified by , the modem automodes down from the highest rate of the
selected modulation. For example:
e. +MS=10,1,1200,24000 selects automoding down from V.32 bis 14400 bps.
is an optional number which specifies the lowest rate at which the
modem may establish a connection. The value is decimal coded, in units of bps,
e.g., 2400 specifies the lowest rate to be 2400 bps. The default is 300 for
300Êbps.
Option Selected Notes
Automode disabled
Automode enabled using V.8 bis/V.8 or V.32 Annex A Default