Multi-Tech Systems MT5600BA-V92 User Manual
Chapter 3 – Voice Commands
Multi-Tech Systems, Inc. AT Commands Reference Guide (S000273G)
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Command: +VNH= Automatic Hang-up Control
Description:
This command enables or disables automatic hang ups.
Syntax: +VNH=<hook>
Values:
<hook> Decimal number corresponding to the selected option.
0
Modem enables automatic hang ups as is normal in other modes.
1
Modem disables automatic hang ups usually found in the other non-
voice modes.
voice modes.
2
The modem disables automatic hang ups in the other non-voice modes.
The modem performs a “logical” hang up (returns OK result code).
The modem performs a “logical” hang up (returns OK result code).
Default
: 0
Report Commands:
+VNH?
Reports current or selected values.
+VNH=?
Reports supported range of parameter values.
Command Responses:
Automatice Hang-up Command Responses
Command
No Carrier Present
ATH
ATZ
DTR & D2
+VNH=0 Y Y
Y
Y
+VNH=1 N Y
Y
Y
+VNH=2 N N
N
Y
Notes:
Y = will hang up; N = will not hang up
How +VNH is reset:
How +VNH is reset:
DTE uses +VNH command to change the setting.
DTE issues another +FCLASS mode change without issuing another +VNH.
A hang-up event occurs (see this table).
DTE issues +VIP command.
DTE issues another +FCLASS mode change without issuing another +VNH.
A hang-up event occurs (see this table).
DTE issues +VIP command.
Command: +FLO Flow Control
Function:
Select Flow Control Method
Values:
0, 1, 2, 3-255
Result Codes:
OK or ERROR
Description:
The +FLO? command lets you select the method of flow control provided and used by the
modem. If +FLO=0, some other method (such as credit flow control) is used. The Xon-Xoff
method is required. Xon is the ASCII character <DC1> (11 hex). Xoff is the ASCII
character >DC3> (13 hex). CCITT V.24 circuits 106 and 133 are optional flow control
methods. If circuits 106 and 133 are not used (+FLO<>2), then circuit 106 is held On
whenever +FCLASS=8.
modem. If +FLO=0, some other method (such as credit flow control) is used. The Xon-Xoff
method is required. Xon is the ASCII character <DC1> (11 hex). Xoff is the ASCII
character >DC3> (13 hex). CCITT V.24 circuits 106 and 133 are optional flow control
methods. If circuits 106 and 133 are not used (+FLO<>2), then circuit 106 is held On
whenever +FCLASS=8.
In Voice mode, circuit 105 has no effect on the state of transmitted data. (Circuit 133
normally reverts to use as circuit 105 (RTS) when not used for Flow Control.)
normally reverts to use as circuit 105 (RTS) when not used for Flow Control.)
+FLO=0
Disables Xon-Xoff and 133/105 flow control
+FLO=1
Enables Xon-Xoff flow control in either direction
+FLO=2
Enables CCITT Circuit 133 for flow control of the modem by the PC; use
CCITT Circuit 106 for flow control of the PC by the modem.
CCITT Circuit 106 for flow control of the PC by the modem.
+FLO=3-255 Reserved for future standards.