N23 data table file monitor, N22 data table file monitor – Rockwell Automation 2755-SNx Adaptascan Bar Code Readers User Manual

Page 168

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10–6

Communicating with an SLC 5/03 Processor on a DeviceNet Network using Explicit Messaging

Publication 2755-6.8

N23 Data Table File Monitor

In Data Table File N23:

•

N23:1 contains the DeviceNet status bits

•

Bit 15 is the control bit from the AdaptaScan Reader which
toggles between 0 and 1 to indicate a ‘new message being sent’

•

N23:2 is the byte count (4) of the message sent from the reader

•

N23:3 is the start the of the data read 3000. Data is actually
0300. All data is byte swapped.

Note: The SLC instruction SWP can be used to swap the bar code
data only.

1747-SDN to AdaptaScan Interface

Data Table

Processor File :MASTER.ACH

Data Table File N23

Address

Data (Radix = ASCII)

N23:0

\00\00

\80\01

\00\04

3 0

0 0

\00\00

N23:10

\00\00

N23:20

\00\00

N23:30

\00\00

N23:40

\00\00

N23:50

\00\00

N23:60

\00\00

N23:70

\00\00

N23:80

\00\00

N23:90

\00\00

N23:100

\00\00

N23:110

\00\00

N23:120

\00\00

N23:130

\00\00

N23:140

\00\00

N23:150

\00\00

N22 Data Table File Monitor

Below is a partial listing of the Data Table File N22. The table
shows N22:1 bit 7 as the DeviceNet status bit which toggles between
0 and 1 to indicate ‘send next message’.

1747-SDN to AdaptaScan Interface

Data Table

Processor File: MASTER.ACH

Data Table File N22

Address

Data (Radix=BINARY)

N22:0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

N22:1

0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0

N22:2

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

N22:3

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

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