Mitsubishi FX3U-USB-BD User Manual page 614

FX Series PLC User's Manual - Data Communication Edition
Non-Protocol Communication (FX
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
5) Status <BFM #28>
b0 → M10: Sending complete
b1 → M11: Receiving complete
b2 → M12: Receiving timeout
b3 → M13: Error occurrence
b4 → M14: Receiving suspended
b5 → M15: Undefined
b6 → M16: Sending
b7 → M17: Receiving
6) Number of bytes to be sent <BFM #1000>
9 bytes
7) Send data buffer <BFM #1001 and later>
The send data "Test data" in ASCII codes is provided to 9 bytes (as specified in BFM#1000).
(BFM#1001)
(BFM#1002)
(BFM#1003)
(BFM#1004)
The 10th byte is not sent.
(BFM#1005)
8) Receive data buffer <BFM #2001 and later>
Eight bytes specified by the maximum number of receivable bytes (BFM #2) are read to data registers
D301 to D304 in the PLC.
G-34
-232IF)
2N
2nd byte
highest-order lowest-order
e (65H) T (54H)
4th byte
t (74H) s (73H)
6th byte
d (64H) (20H)
8th byte
t (74H) a (61H)
10th byte
* * a (61H)
6.1 Example of Sending/Receiving 16-Bit Buffer Length Data
(STX)
H
(ETX)
H
b8 → M18: RS(RTS)
b9 → M19: ER(DTR)
b10 → M20: Undefined
b11 → M21: Undefined
b12 → M22: DR(DSR)
b13 → M23: CD(DCD)
b14 → M24: CS(CTS)
b15 → M25: CI(RI)
1st byte
3rd byte
5th byte
Space
7th byte
9th byte
6 Practical Program Examples