PAGE 10
14 MAY 2002
CH. 2
MAN0484-01
2.4
Transmit Channel
The Transmit Channel can be used one of two ways. It can be used to send data to a device on the
network or it can be used as low priority request to retrieve data from a device on the network.
The complete Transmit Channel uses 11 %AQs, 2 %Qs and 2 %Is. The %AQs and %AIs vary depending
on whether a send data or request data type of communication is used.
2.4.1
Transmit Channel Register Definitions
The following are the registers used by the Transmit Channel and the corresponding descriptions. Not all
registers are used for both types of communications.
Table 2.1 - %AQ Definitions for Transmit Channel
%AQ Register
Description
AQx
PGN
AQx+1
Destination Address (255 – Global)
AQx+2
Number of bytes (Up to 8)
AQx+3
Starting %R register/ Byte value 1
AQx+4
Byte value 2
AQx+5
Byte value 3
AQx+6
Byte value 4
AQx+7
Byte value 5
AQx+8
Byte value 6
AQx+9
Byte value 7
AQx+10
Byte value 8
Table 2.2 - %R Definitions for Transmit Channel
%R Register
Description (High/Low byte)
Rx
Requested PGN
Rx+1
Request data value byte 1
Rx+2
Request data value byte 2
Rx+3
Request data value byte 3
Rx+4
Request data value byte 4
Rx+5
Request data value byte 5
Rx+6
Request data value byte 6
Rx+7
Request data value byte 7
Rx+8
Request data value byte 8
