Rockwell Automation 1769-ASCII Compact Module - Manual (Page 21)

Compact 1769-ASCII Module 21
Publication 1769-IN068B-EN-P - May 2005
Simultaneous Mode (Two Channels) Output 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
Wo
rd
Bit Position
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Channel 0 Data
0 Reserved Tx Transaction ID
1 Reserved Rx Transaction ID Request
2 Reserved
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 configuration 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 Reserved Tx Transaction ID
x+2 Reserved Rx Transaction ID Request
x+3 Reserved
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 …