442
The transmission message and reception message have the following struc-
ture.
Header
Address
Length
Data
Error check
Terminator
Item
Function
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.
Data attribute
Header
Address
Length
Data
Error check
Terminator
T M
R M
T M
R M
T M
R M
T M
R M
T M
R M
T M
R M
Constant
ASCII
“
”
HEX
[
]
Yes
Yes
Yes
Yes
---
---
Yes
Yes
---
---
Yes
Yes
Special characters
CR, STX, etc.
Yes
Yes
---
---
---
---
Yes
Yes
---
---
Yes
Yes
No variable
conversion
First-order equation
using variable (N)
---
---
Yes
Yes
---
---
Yes
Yes
---
---
---
---
Wild card (
)
---
---
---
Yes
---
---
---
Yes
---
---
---
---
Read word (R)
---
---
Yes
Yes
---
---
Yes
Yes
---
---
---
---
Write word (W)
---
---
---
Yes
---
---
---
Yes
---
---
---
---
Automatic variable:
LNG
---
---
---
---
Yes
Yes
---
---
---
---
---
---
Automatic variable:
SUM, LRC, and CRC
---
---
---
---
---
---
---
---
Yes
Yes
---
---
Variable
ASC
i
First-order equation
using variable (N)
---
---
Yes
Yes
---
---
Yes
Yes
---
---
---
---
SC
conversion
Wild card (
)
---
---
---
Yes
---
---
---
Yes
---
---
---
---
Read word (R)
---
---
Yes
Yes
---
---
Yes
Yes
---
---
---
---
Write word (W)
---
---
---
Yes
---
---
---
Yes
---
---
---
---
Automatic variable:
LNG
---
---
---
---
Yes
---
---
---
---
---
---
---
Automatic variable:
SUM, LRC, and CRC
---
---
---
---
---
---
---
---
Yes
---
---
---
Variable
HEX
First-order equation
using variable (N)
---
---
Yes
Yes
---
---
Yes
Yes
---
---
---
---
conversion
Wild card (
)
---
---
---
Yes
---
---
---
Yes
---
---
---
---
Read word (R)
---
---
Yes
Yes
---
---
Yes
Yes
---
---
---
---
Write word (W)
---
---
---
Yes
---
---
---
Yes
---
---
---
---
Automatic variable:
LNG
---
---
---
---
---
Yes
---
---
---
---
---
---
Automatic variable:
SUM, LRC, and CRC
---
---
---
---
---
---
---
---
---
Yes
---
---
Transmission/Reception
Message Structure
The Protocol Macro Function
Section 8-6
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