Allen-Bradley 1769-ASCII, Installation Instructions Manual, Page: 19 / 40

Compact 1769-ASCII Module 19
Publication
1769-IN068B-EN-P - May 2005
Simultaneous Mode (Two Channels) Input File
Maximum size is shown below. Refer to the Compact I/O 1769-ASCII
Module User Manual, publication 1769-UM012, to use smaller output files.
•
Tx = Transmit
•
Rx = Receive
•
TG = Transmit greater than Max Error. Transmit length in the output
file is greater than the maximum transmit character length in the
configuration file.
Wo
rd
Bit Position
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Channel 0 Data
0 Tx ID Acknowledged Rx Transaction ID
1 Reserved TG TS ND HE NR RF TF PA RO TO
2 Firmware Revision, Major Firmware Revision, Minor
3 Length (Number of Bytes)
4 Character 1 Character 0
5 Character 3 Character 2
… Character … Character …
x
(1)
(1)
X is calculated based on the size of Channel 0 data as specified in the input file. Both channels
cannot contain 200 characters as the total configuration file size can be only 108 words.
Last Character Character …
Channel 1 Data
x+1 Tx ID Acknowledged Rx Transaction ID
x+2 Reserved TG TS ND HE NR RF TF PA RO TO
x+3 Firmware Revision, Major Firmware Revision, Minor
x+4 Length (Number of Bytes)
x+5 Character 1 Character 0
x+6 Character 3 Character 2
… Character … Character …
y
(2)
(2)
Y is equal to the connection size minus 1, with a maximum value of 107 for a buffer size of 108.
Last Character Character …