3
6. V-Link
3-29
Ser
Sum Check Code (SUM): 2 bytes
Data is added up (SUM), and the lower one byte (8 bits) of the sum is converted into the
2-digit ASCII code (hexadecimal). A sum check code is shown below.
Example: Transmission mode: without CR/LF, with sum check
Command: 20
(data
read)
Address:
10 words from $u1000 (03E8H)
When reading, a sum check will be performed as shown below.
Response Code: 2 bytes
[ACK]
This code is received at normal termination.
00H
(3030: ASCII)
[NAK]
This code is received at abnormal termination. (ASCII) Refer to the next page for more
information.
NAK: Error Codes
02H:
Overrun/Framing error
An overrun or framing error is detected in the received data. Send the command
again.
03H:
Parity error
A parity error is detected in the received data. Send the command again.
04H:
Sum check error
A sum error occurs with the received data.
06H:
Count error
The memory read/write count is “0.”
0FH:
ETX error
No ETX code is found.
11H:
Character error
A character not used in the received data is found. (other than 0 to F) Check the
character and send the command again.
12H:
Command error
An invalid command is given.
13H:
Memory setting error
The address or device number is invalid.
STX
V7 Port
number
Command
Read
Words
Memory
Model
Memory
Type
Address
System reserved
ETX
SUM
01H
20H
0AH
00H
00H
03E8H
0 0 0 0 0 0 0 0 0 0H
B9H
02H
30H31H
32H30H
30H41H
30H30H
30H30H
30H 33H 45H 38H
30H 30H 30H 30H 30H 30H 30H 30H 30H 30H
03H
42H39H
02H + 30H + 31H + 32H + 30H + 30H + 41H + 30H + 30H + 30H + 30H + 30H + 33H + 45H + 38H
+ 30H + 30H + 30H + 30H + 30H + 30H + 30H + 30H + 30H + 30H + 03H =
4
B9
H
Summary of Contents for Monitouch V7
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Page 343: ...5 136 29 Automationdirect PLC Please use this page freely...