Frh, Receive Data With Hdlc Frame; Ifc, Terminal-G24 Local Flow Control - Motorola G24 Guide Developer's Manual

Fax Class 1

+FRH, Receive DATA with HDLC Frame

This command causes the G24 to receive HDLC framed data using the modulation mode selected
in <MOD>, and deliver the next received frame to the terminal.
If the G24 detects the selected carrier with an HDLC flag, the G24 send the CONNECT result
code to the terminal, otherwise it sends "NO CARRIER".
The G24 sends the FCS octant to the terminal. The terminal may ignore the FCS.
Upon receipt of the CONNECT from G24, the terminal can start receiving the data stream using
the transparent data command decoding. (Refer to
Modulation Parameters" on page
After the FCS octets are transferred, the G24 marks the end of the frame with the characters
<DLE> <ETX>, and reports the status of the frame reception to the terminal, as follows:
•
If the frame was received correctly (FCS is OK), the G24 returns the OK result code.
•
If the frame was received in error (FCS is not OK, or carrier lost, or data lost due to data
overflow), the G24 returns the ERROR result code, and the terminal should discard the
frame.
After the status result code, the G24 accepts new commands from the terminal.
Command Type
Set
Note:

+IFC, Terminal-G24 Local Flow Control

This parameter controls the operation of the local flow control between the terminal and the G24
during the data state when V.42 error control is used, or when fallback to non-error control mode
is specified to include buffering and flow control. It accepts two numeric subparameters:
•
<DCE_by_DTE>: Specifies the method to be used by the terminal to control the flow of
received data from the G24.
•
<DTE_by_DCE>: Specifies the method to be used by the G24 to control the flow of
transmitted data from the terminal.
3-430
3-427).
Syntax
+FRH = <MOD>
MOD = 3 (Clause 2/V.21) rate 300 bps, is mandatory.
AT Commands Reference Manual
"Command Modulation Select Codes -
Response/Action
CONNECT The Set command causes the G24 to
receive HDLC framed data using the
or:
modulation mode selected in <MOD>,
NO CARRIER
and deliver the next received frame to
the terminal.
Remarks
December 31, 2007