1022
Serial Communications Instructions
Section 3-24
3-24-7 CHANGE SERIAL PORT SETUP: STUP(237)
Purpose
Changes the communications parameters of a serial port on the CPU Unit,
Serial Communications Board (CS Series only), or Serial Communications
Unit (CPU Bus Unit). STUP(237) thus enables the protocol mode to be
changed during PLC operation.
RXDU
D00100
D00200
&10
155906
A20203
D
C
N
000000
C: D00200
0
0
7
8
15
0
11
12
3
0
Serial Communications Unit's unit address
(CPU Bus Unit's unit address)
12: Unit a 10 hex
7
8
15
1
11
12
0
1
4 3
Always 0
0: No RS and ER signal control
1
2
4 3
3: Communications port No. 3
Communication port No. specifier (internal logic port)
1: Serial port No. 1
Serial Communications Unit's serial port specifier
D: D00100
0
7
8
15
4
1
2
Most significant bytes Least significant bytes
D00101
8
5
6
D00102
A
B
1 2 3 4 5 6 7 8 A B C D E F G H I J K L
10 bytes
34
12
ST
56
78 AB CD
ST: Start code (e.g., 02 hex)
ED: End code (e.g., 03 hex)
Data received
D
3
7
C
H
E
F
L
I
J
G
K
D00103
D00104
EF GH IJ
KL ED
C+1: D00201
C+1
3
0
88: 80 + (04_Unit No. 2)
7
8
15
0
11
12
8
8
4 3
3: Communications port No. 3
Communications port No. specifier (internal logic port)
0: Directly specified serial port unit address
Note:
Allocated DM Area Settings
•
Start code/end code
D30204:
0
End code (e.g., 03 hex)
7
8
15
2
11
12
0
3
4 3
Start code (e.g., 02 hex)
0
•
Start code/end code specifier
D30205:
0
7
8
15
1
11
12
4 3
1
End code specifier
1: Use end code
00: Unlimited (256 bytes max.)
1: Least significant byte to most significant byte
RS and ER signal control
Serial Communications Unit's serial port unit address specifier
Number of receive data bytes
Start code specifier
1: Use start code
Communications
Port Enabled
Flag
Reception
Completed
Flag
Note:
The Serial Communications Unit's serial port unit address can
also be directly specified in C+1.
Received in
specified
order:
Start and end codes added
according to setting in PC Setup
Summary of Contents for SYSMAC CS1D-CPU**
Page 3: ...iv...
Page 29: ...xxx...
Page 185: ...146 List of Instructions by Function Code Section 2 4...
Page 1389: ...1350 CJ series Instruction Execution Times and Number of Steps Section 4 2...
Page 1390: ...1351 Appendix A ASCII Code Table ASCII SP Four leftmost bits Four rightmost bits...
Page 1391: ...1352 ASCII Code Table Appendix A...