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ModemModule Developer’s Guide
MT3334SMI36
Command: +FRM=? <Enter>
Function: Display the valid range of receive data modulation values
Values: <MOD> = 3, 24, 48, 72, 73, 74, 96, 97, 98, 121, 122, 145, 146
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=<MOD> command.
Command: +FTH=<MOD> <Enter>
Function: Transmit HDLC data with <MOD> carrier
Values: see Table 3-1 for <MOD> (modulation) values
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 <MOD> values). The modem
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 <Enter> key).
Command: +FTH=? <Enter>
Function: Displays the valid range of transmit modulation values
Values: <MOD> = 3, 24, 48, 72, 73, 74, 96, 97, 98, 121, 122, 145, 146
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=<MOD> command (refer to Table 3-1).
Command: +FRH=<MOD> <Enter>
Function: Receive HDLC data with <MOD> carrier
Values: see Table 3-1 for <MOD> (modulation) values
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 <MOD>, then delivers the next frame to the PC.
Possible <MOD> values are shown in Table 3-1. If other than an HDLC packet is
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 <Enter> key).
Command: +FRH=? <Enter>
Function: Displays the valid range of receive modulation values
Values: <MOD> = 3, 24, 48, 72, 73, 74, 96, 97, 98, 121, 122, 145, 146
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=<MOD> command).