Rockwell Automation Publication 1769-IN088A-EN-P - February 2011 185
I/O Memory Mapping Chapter 3
The bits are defined as follows:
• Tx = Transmit
• Rx = Receive
Configuration File
The 1769-ASCII module supports a configuration assembly that is accessible
through the Assembly Object (Class 4), Instance 102. The configuration
assembly is 31 words. The addresses assume a 16-bit data structure where all 16-
bit values are INT
(1)
. The least significant word occupies the smaller byte
addresses.
(1) INT = Integer range of -32768 to +32767 decimal, 0000 to FFFF hexadecimal.
Word
Description Values Valid Data Values
0 Data Buffer Mode 0…1 0 = alternate mode
1 = simultaneous mode
Channel 0
1 Serial Character Framing 0…8 0 = 7N2, 1 = 7E1, 2 = 7O1, 3 = 8N1, 4 = 8N2,
5 = 8E1, 6 = 8O1, 7 = 7E2, 8 = 7O2
2 Serial Port Speed 0…7 0 = 9600, 1 = 1200, 2 = 2400, 3 = 4800,
4 = 19200, 5 = 38400, 6 = 57.6k, 7 = 115.2k
(half-duplex only)
Serial Port Receive Data
3 Max Number of Receive
Characters
0…200 In Simultaneous mode, the total number of
channel 0 characters plus channel 1
characters cannot exceed 200.
4 Receive Record Start Mode 0…2 0 = ignore, 1 = exclude, 2 = include start
delimiter
5 Receive Start Delimiter
(1)
0…127/255 0…0x7f (0…127) for 7-bit data
0…0xff (0…255) for 8-bit data
6 Receive Record End Mode 0…2 0 = ignore, 1 = exclude, 2 = include end
delimiter
7 Receive End Delimiter
(1)
0…127/255 0…0x7f (0…127) for 7-bit data
0…0xff (0…255) for 8-bit data
Module Production Data
8 Pad Character
(1)
0…127/255 0…0x7f (0…127) for 7-bit data
0…0xff (0…255) for 8-bit data
9 Receive Swap Mode 0…2 0 = disabled, 1 = 16-bit, 2 = 32-bit
10 Master Handshake Mode 0…1 0 = master/slave handshake,
1 = produce immediate
11 Message Time Out 0…65535 0 = none, 1 to 65535 ms
Serial Port Transmit Data
12 Max Number of Transmit
Characters
0…200 In Simultaneous mode, the total number of
channel 0 characters plus channel 1
characters cannot exceed 200.
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