Embedded Modem Developer's Guide

Chapter 6 – Fax Class 1 and Class 1.0 Commands
Multi-Tech Systems, Inc. SocketModem MT5600SMI Developer’s Guide 93
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 6-2.
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.