Multi-Tech Systems Modem Module MT3334SMI User Manual
Page 36

ModemModule Developer’s Guide
MT3334SMI
36
Command:
+FRM=?
Function:
Display the valid range of receive data modulation values
Values:
Default:
3 (V.21 ch.2 @ 300 bps)
Result Codes: the current value range supported by the modem.
Description:
The +FRM=? command causes the modem to display the current modulation for
receive data spcified by the +FRM=
Command:
+FTH=
Function:
Transmit HDLC data with
Values:
see Table 3-1 for
Default:
3 (V.21 ch.2 @ 300 bps)
Result Codes: OK, ERROR, or CONNECT
Description:
The +FTH command causes the modem to transmit data in HDLC protocol using the
selected modulation (see Table 3-1 for modulation
buffers data in HDLC transmit mode, using the configured method of flow control to
pause PC data, as necessary. If the PC sends no data for 5 seconds after the
CONNECT message, the modem turns off its transmit carrier, returns to Command
mode, and displays the OK message.
Note: The +FTH command must be entered as the last command in the command string (i.e., it
must be immediately followed by the
Command:
+FTH=?
Function:
Displays the valid range of transmit modulation values
Values:
Default:
3 (V.21 ch.2 @ 300 bps)
Result Codes: the current range of valid values supported by the modem.
Description:
The +FTH=? command causes the modem to display the set of supported transmit
modulations specified by the +FTH=
Command:
+FRH=
Function:
Receive HDLC data with
Values:
see Table 3-1 for
Default:
3 (V.21 ch.2 @ 300 bps)
Result Codes: NO CARRIER, +FCERROR, OK, or ERROR
Description:
The +FRH command causes the modem to receive HDLC packet data using the
modulation mode selected with
Possible
detected, the modem displays the +FCERROR (Connect Error) message, returns to
Command mode, then displays the NO CARRIER message. If this command is
entered with the modem on-hook, the ERROR result code is displayed.
Note: The +FRH command must be entered as the last command in the command string (i.e., it
must be immediately followed by the
Command:
+FRH=?
Function:
Displays the valid range of receive modulation values
Values:
Default:
3
Result Codes: the valid range of values supported by the modem.
Description:
The +FRH=? command causes the modem to display the set of supported receive
modulation values (specified by the +FRH=