Mitsubishi Electric MELSEC iQ-RJ71C24-R2 - Page 335

16 TRANSPARENT CODES AND ADDITIONAL CODES
16.4 Data Communication Using Nonprocedural Protocol
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16
Reception example based on the receive end data quantity
When C24 receives data from the target device when the transparent code designation is enabled
Ex.
Transparent code designation: Additional code: 10H (DLE), Transparent code: 02H (STX), Receive end data quantity
designation: 6-word or 12-word
When the transparent code for receiving specification is enabled, the codes for receivable data and the codes for the received
data which is stored is stored in the receive area on the buffer memory are as shown below.
Type Receivable codes Codes stored in the receive
area
Transparent code for receiving
specification portion
Additional code 01H to FFH (Delete)
Transparent code 00H to FFH 00H to FFH
Arbitrary data portion (including end code)
30H31H 32H 33H 10H 02H 00H 41H 12H 43H 44H42H 34H
0123
D
L
E
BA
(1234H)
DC
S
T
X
N
U
L
L
X3
M0
M1
ON
ON
INPUT
00H , 06H
(1) (0)
31H , 30H
(3) (2)
33H , 32H
(NULL) (STX)
00H , 02H
(B) (A)
42H , 41H
(1234H)
12H , 34H
(D) (C)
44H , 43H
D10
D11
D12
D13
D14
D15
00H , 06H
(1) (0)
31H , 30H
(3) (2)
33H , 32H
(NULL) (STX)
00H , 02H
(B) (A)
42H, 41H
(1234H)
12H , 34H
(D) (C)
44H , 43H
D2
Additional code (C24 deletes)
Transparent code
Head data
For word unit:
Number of received byte excluding additional code (12)/2=6
For byte unit:
Number of received byte excluding additional code (12)
Target device
C24
Reception data
read request
Receive data count is
stored
CPU module
The following diagram is for word unit
Completion device
Abnormal
completion
Status display device
at completion
Un\G1536
Normal
completion
Un\G1537
1 scan
Un\G1538
Un\G1539
Un\G1540
Un\G1541
Un\G1542
Buffer memory
Program
device memory