Multi-Tech Systems Modem Module MT3334SMI - Manual (Page 36)

ModemModule Developer’s Guide
MT3334SMI 36
Command: +FRM=?
Function: Display the valid range of receive data modulation values
Values: = 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= command.
Command: +FTH=
Function: Transmit HDLC data with carrier
Values: see Table 3-1 for (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 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 key).
Command: +FTH=?
Function: Displays the valid range of transmit modulation values
Values: = 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= command (refer to Table 3-1).
Command: +FRH=
Function: Receive HDLC data with carrier
Values: see Table 3-1 for (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 , then delivers the next frame to the PC.
Possible 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 key).
Command: +FRH=?
Function: Displays the valid range of receive modulation values
Values: = 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= command).