How to Send an IFRs with the DCX module using IOCTLs

Telnet to Gryphon as root. The example session looks as follows

gryphon# gioctl localhost -c 1 -i 0x11410001 –d 0xXX 0xXX 0xXX 0xXX 0xXX 0xXX 0xXX 0xXX 

-c channel number 
-i Ioctl value 
GVPWADDIFR 0x11410001 
-d data

IFR response is used to send a response to an IFR request. It consists of the IFR data to send, criteria the received message data should meet, whether the normalization bit should be set, and how many bytes of data the message being replied to will have.

Length Description

2 bytes IFR filter length

2 bytes IFR length

1 byte Normalization bit (boolean, 0 or 1)

1 byte Reserved

2 bytes Message Length, number of bytes to receive before sending IFR data

IFR filter length (Designated in field above) IFR filter to match incoming message to send an IFR; used as match for mask field following

IFR filter length (Designated in field above) IFR filter mask, 0 = don't care, 1 = care

IFR length (Designated in field above) IFR data to send in response to message matching pattern and mask

Length	Description
2 bytes	IFR filter length
2 bytes	IFR length
1 byte	Normalization bit (boolean, 0 or 1)
1 byte	Reserved
2 bytes	Message Length, number of bytes to receive before sending IFR data
IFR filter length (Designated in field above)	IFR filter to match incoming message to send an IFR; used as match for mask field following
IFR filter length (Designated in field above)	IFR filter mask, 0 = don't care, 1 = care
IFR length (Designated in field above)	IFR data to send in response to message matching pattern and mask

**Note: All fields which are 2 bytes in length are in host byte order.

Example:

gioctl localhost -c 5 -i 0x11410001 -d 0x02 0x00 0x02 0x00 0x01 0x00 
0x05 0x00 0x22 0x33 0xff 0xff 0xaa 0xbb

This will send a 2-byte IFR of AA BB when the received message contains 22 33. The IFR will be sent after 5 bytes of message are received. The normalization bit will be set.

Length Description Value Byte Alignment

2 bytes IFR filter length 2 02 00

2 bytes IFR length 2 02 00

1 byte Normalization bit (boolean, 0 or 1) 1 01

1 byte Reserved 00 00

2 bytes Message Length, number of bytes to receive before sending IFR data 5 05 00

IFR filter length (Designated in field above) IFR filter to match incoming message to send an IFR; used as match for mask field following 22 33 22 33

IFR filter length (Designated in field above) IFR filter mask, 0 = don't care, 1 = care FF FF FF FF

IFR length (Designated in field above) IFR data to send in response to message matching pattern and mask AA BB AA BB

Length	Description	Value	Byte Alignment
2 bytes	IFR filter length	2	02 00
2 bytes	IFR length	2	02 00
1 byte	Normalization bit (boolean, 0 or 1)	1	01
1 byte	Reserved	00	00
2 bytes	Message Length, number of bytes to receive before sending IFR data	5	05 00
IFR filter length (Designated in field above)	IFR filter to match incoming message to send an IFR; used as match for mask field following	22 33	22 33
IFR filter length (Designated in field above)	IFR filter mask, 0 = don't care, 1 = care	FF FF	FF FF
IFR length (Designated in field above)	IFR data to send in response to message matching pattern and mask	AA BB	AA BB

This document was obtained from:

Dearborn Group, Inc.
(248) 488-2080
dg@dgtech.com
http://www.dgtech.com