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Chapter 2 – Fax Class 1 and 1.0 Commands
Multi-Tech Systems, Inc. SocketModem MT5634SMIxx Reference Guide (S000263C) 40
Command: FTH Transmit Data with HDLC Framing
Description: This command causes the modem to transmit data using HDLC protocol and
the modulation defined below.
Defined Values: <mod> Decimal number corresponding to the selected modulation mode and
data rates shown in Table 3-2.
Result Codes: CONNECT Reported for either of two conditions:
1. At the beginning of transmission of the training pattern for the selected
modulation.
2. If the Final Frame bit is 0.
OK Reported for either of two conditions:
1. If the Final Frame Bit is 1.
2. If the DTE sends only <DLE><ETX> (a null frame) while transmitting flags.
ERROR – Reported if five seconds elapse from the time when the modem
reported the CONNECT result code without any additional data transmitted
from the DTE; the modem then turns off carrier and returns to the command
mode.
Reporting Current or Selected Values:
Command: +FTH?
Response: +FTH: <mod>
Example: +FTH: 98 For V.17 9600 bps.
Reporting Supported Range of Parameter Values:
Command: +FTH?
Response: +FTH?
Example: +FTH: 98 For V.17 9600 bps.
Command: +FRH Receive Data with HDLC Framing
Description: This command causes the modem to receive frames using HDLC protocol
and the modulation defined below. An ERROR response code results if this
command is issued while the modem is on-hook.
Defined Values: <mod> Decimal number corresponding to the selected modulation mode and
data rates shown in Table 3-2.
Reporting Current or Selected Values:
Command: +FRH?
Response: +FRH: <mod>
Example: +FRH: 98 For V.17 9600 bps.
Reporting Supported Range of Parameter Values:
Command: +FRH?
Response: +FRH?
Example: +FRH: 98 For V.17 9600 bps.
Result Codes: CONNECT Reported for either of two conditions:
1. When the selected carrier is detected with an HDLC flag.
2. If the DTE sends another +FTH=<MOD> command after sending the result
code indicating frame reception is complete.
+FCERROR – Reported if a different carrier is detected and FAR=0.
NO CARRIER – Reported if loss of carrier is detected.
OK – Reported for either of two conditions:
1. If a frame was received correctly.
2. If the DTE sends any character other than XON or XOFF while the modem
is in the configured flow control.
ERROR – Reported if a frame was received in error.