Allen-Bradley 1769-ASCII Installation Instructions Manual page 17

• 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.
15 14 13
0 Tx ID 0 Acknowledged
1 15 14 13
2 Tx ID 1 Acknowledged
3 15 14 13
4
5
6 Firmware Revision, Major
7
8
9
...
106
107
• 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.
12 11 10
12 11 10 TG0 TS0 ND
12 11 10 TG1 TS1 ND
Length (Number of Bytes)
Character 1
Character 3
Character ...
Character 197
Character 199
Compact 1769-ASCII Module 17
Bit Position
9 8 7 6
HE0 NR
0
HE1 NR
1
Reserved
Reserved
Firmware Revision, Minor
Publication
5 4 3 2
Rx Transaction ID Ch0
RF0 TF0 PA0 RO0 TO0
0
Rx Transaction ID Ch1
RF1 TF1 PA1 RO1 TO1
1
Character 0
Character 2
Character ...
Character 196
Character 198
1769-IN068B-EN-P - May 2005
1 0
CNI
CNO