Sending/Receiving 8-Bit Buffer Length Data - Mitsubishi Electric FX3U-232-BD User Manual

FX Series PLC User's Manual - Data Communication Edition
Non-Protocol Communication (FX
6.2

Sending/Receiving 8-Bit Buffer Length Data

In this example, the 8-bit buffer length data is sent and received between the 232IF and equipment with the
terminal specifications. In this example, ASCII codes stored in the data registers D201 to D209 in the PLC are
sent to the external equipment, and the data received from the external equipment is stored to data registers
D301 to D308 in the PLC.
1. System configuration
FX Series
3U
2. Example of setting buffer memory
Suppose that each buffer memory not described here is set to the initial value.
1) Communication format <BFM #0>
Bit
b0 Data length
b1
Parity
b2
b3 Stop bit
b4
b5
Baud rate
b6
b7
b8
Control line
b9
b10
CR and LF addition
b11
b12 Absence/presence of check sum and ASCII-
b13 Hexadecimal conversion
b14 Send/receive data buffer data length
b15 Undefined
b15
0 1 0
4
2) Command <BFM #1>

M0 b0: Sending/receiving enable (ER ON)
M1  b1: Sending command
M2 
b2: Receiving complete flag reset command

M3 b3: Error reset
3) Maximum number of receivable bytes <BFM #2>
8 bytes
4) Header and terminator <BFM #4 to 11>
BFM #4 and 8 (sending header and receiving header): 02
BFM #6 and 10 (sending terminator and receiving terminator): 03
-232IF)
2N
PO W E R
S D
R D
+
FX -232IF
2N
Contents
b8 b7
0 0 0 0 0 1 0 0 1
0 9
6.2 Sending/Receiving 8-Bit Buffer Length Data
Cross cable
Personal computer, etc.
Setting
(1) : 8-bit
(1,1) : Even
(1) : 2-bit
(1001) : 19200 bps
(00) : Not provided
(00) : Not provided
(00) : Not provided
(1) : 8-bit
—
b0
1 1 1 1
F
(409F )
H
(STX)
H
(ETX)
H
6 Practical Program Examples
 Item to specify 8-bit data
G-37
A
B
C
D
E
F
G
H
I
Apx.A