Rockwell Automation 1769-ASCII Compact Module - Manual (Page 17)

Compact 1769-ASCII Module 17
Publication 1769-IN068B-EN-P - May 2005
• CNO = Channel number of the output data being sent. This bit is set
by the PLC controller or other user program to tell the ASCII module
which port’s data is being sent to the ASCII module.
• Reserved bits should be set to 0.
Alternate Mode (One Channel at a Time) Input File
Maximum size is shown below. Refer to the Compact I/O 1769-ASCII
Module User Manual, publication 1769-UM012, to use smaller input files.
• Tx = Transmit
• Rx = Receive
• TS = Transmit sent. Indicates the ASCII module has sent the data
indicated by the Tx Transaction ID and can accept more transmit
data.
• ND = New data. Only used for Handshake mode.
• HE = Handshake error. Only used for Handshake mode.
Wo
rd
Bit Position
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
0 Tx ID 0 Acknowledged Rx Transaction ID Ch0
1 15 14 13 12 11 10 TG0 TS0 ND
0
HE0 NR
0
RF0 TF0 PA0 RO0 TO0
2 Tx ID 1 Acknowledged Rx Transaction ID Ch1
3 15 14 13 12 11 10 TG1 TS1 ND
1
HE1 NR
1
RF1 TF1 PA1 RO1 TO1
4 Reserved CNI
5 Reserved CNO
6 Firmware Revision, Major Firmware Revision, Minor
7 Length (Number of Bytes)
8 Character 1 Character 0
9 Character 3 Character 2
… Character … Character …
106 Character 197 Character 196
107 Character 199 Character 198