18
V550-A20 Operation Manual
Section
3-
18
Connecting Your V550-A20 To An External Device
Framing for all messages sent by any device on the multidrop line:
FF STX ID TYPE SEQ DATA LRC CR
C200H Alpha Communications Board Connections:
The connections from the bar code reader connectors to the C200H
Alpha COM board are shown below.
V550-A20
C200HX/C200HG/C200HE
Bar Code Reader
Communications Board
V550-A20 Pin Configuration
C200H Alpha COM
Board Pinout
Note: The above connection is shown using the C200H Alpha PLC
with protocol macro function. Contact OMRON for the latest V550-
A20 Protocol macro.
FF (hex)
Guard character
Ignored by receiver.
STX (02hex)
Start of text character
Indicates start of a message.
ID (2 ASCII digits)
Unit identifier
Indicates BCR identification
number.
TYPE (2 ASCII digits)
Message type
Describes purpose of the message.
SEQ
Sequence number
Starts at 0 at power up;
incremented by 1 for each data
message sent.
DATA
Content of data field
May or may not contain characters.
LRC (2 ASCII digits)
Linear redundancy
Checks to ensure that message is
checks
valid.
CR
Carriage return
Indicates end of message.
Summary of Contents for V550-A20
Page 1: ...i V550 A20 Operation Manual V550 A20 Bar Code Reader Operation Manual Cat No Q01BAZ2...
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Page 26: ...12 V550 A20 Operation Manual Section 2 12 What to Do After Receiving the V550 A20...
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Page 66: ...18 V550 A20 Operation Manual Section 5 18 Appendices...