When Control Line Is In Rs-232C Interlink Mode [Bfm #0, (B9, B8) = (1, 1)] - Mitsubishi FX3U-USB-BD User Manual

FX Series PLC User's Manual - Data Communication Edition
Non-Protocol Communication (FX
5.5.3

When control line is in RS-232C interlink mode [BFM #0, (b9, b8) = (1, 1)]

Sending/receiving
OFF
enable
(BFM#1 b0)
OFF
DR(DSR)
Sending
command
OFF
(BFM#1 b1)
*1
OFF
CS(CTS)
SD(TXD)
Send data
Sending
OFF
complete
(BFM#28 b0)
RS(RTS)
OFF
RD(RXD)
Receive data
Receiving
suspended
OFF
(BFM#28 b4)
Receiving
OFF
complete
(BFM#28 b1)
Receiving
complete flag
reset command
(BFM#1 b2)
OFF
*1. Make sure that the CS (CTS) signal turns ON in the 232IF while the external equipment is ready to
receive.
*2. When the amount of data already received exceeds the maximum number of receivable bytes
specified by BFM #2, the RS (RTS) signal turns OFF. Accordingly, sending is suspended from the
external equipment within 30 bytes when the send/receive data buffer data length is 16-bit (BFM #0,
b14= 0), or within 15 bytes when the send/receive data buffer data length is 8-bit (BFM #0, b14= 1).
If sending is not suspended, the 232IF cannot receive all sent data.
*3. Read the amount of received bytes (BFM #14) from the received data buffer (BFM #2001 to 2271) to
data registers in the PLC, and then set it to ON.
G-32
-232IF)
2N
ON
ON
Set this bit to OFF in the
sequence program.
While it remains ON, the
next data cannot be sent.
ON
Time set by BFM #20
multiplied by 10 ms
Message 2
Time set by BFM
#21 multiplied by
10 ms
ON
Message 1
ON
After receiving is completed and the received data is
read, set the receiving complete flag (BFM #28, b1) to
OFF using the receiving complete flag reset
command.
*1
Message 4
ON
Message 3
Time set by BFM #12
multiplied by 10 ms
Set this bit to OFF in the
sequence program. While
it remains ON, the next
receiving complete flag
reset command cannot be
given.
Set this bit to OFF in the sequence program.
While it remains ON, the next receiving
complete flag reset command cannot be given.
5 Creating Programs
5.5 Operation of Control Line
Message 3
ON