Omron C200HX Operation Manual page 460
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The Protocol Macro Function
Transmission/Reception
Message Structure
Data attribute
Constant
ASCII
"jjjj"
HEX
[jjjj]
Special characters
CR, STX, etc.
No variable
First-order equation
conversion
using variable (N)
Wild card ()
Read word (R)
Write word (W)
Automatic variable:
LNG
Automatic variable:
SUM, LRC, and CRC
Variable
First-order equation
ASC
SC
using variable (N)
conversion
i
Wild card ()
Read word (R)
Write word (W)
Automatic variable:
LNG
Automatic variable:
SUM, LRC, and CRC
Variable
First-order equation
HEX
using variable (N)
conversion
Wild card ()
Read word (R)
Write word (W)
Automatic variable:
LNG
Automatic variable:
SUM, LRC, and CRC
442
The transmission message and reception message have the following struc-
ture.
Header
Address
Length
Item
Header
Set the data that indicates the beginning of the message.
Address
Set the node number or other identifier that indicates the
destination for the message.
Length
The data length (number of bytes) is added automatically.
Data
Set the message contents.
Error check code
Set SUM, LRC, or CRC as the error check code. The specified
error check code will be added automatically when transmitting.
When receiving, error control will be performed automatically
based on the error check code specified in the message and
the specified amount (length) of data will be received.
Terminator
Set the data that indicates the end of the message.
The following attributes can be set for each item in the transmission or reception
message. The abbreviation "R M" stands for reception message and "T M"
stands for transmission message.
Header
Address
T M
R M
T M
R M
Yes
Yes
Yes
Yes
Yes
Yes
---
---
---
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Yes
Yes
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Yes
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Yes
Yes
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Yes
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Yes
Yes
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Yes
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Yes
Yes
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Yes
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Yes
Yes
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Yes
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Yes
Yes
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Yes
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Data
Function
Length
Data
Error check
T M
R M
T M
R M
---
---
Yes
Yes
---
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---
Yes
Yes
---
---
---
Yes
Yes
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Yes
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Yes
Yes
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Yes
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Yes
Yes
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Yes
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Yes
Yes
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Yes
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Yes
Yes
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Yes
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Yes
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Yes
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Yes
Yes
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Yes
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Yes
Yes
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Yes
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Yes
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Section 8-6
Error check
Terminator
Terminator
T M
R M
T M
R M
---
Yes
Yes
---
Yes
Yes
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Yes
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Yes
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