Rs Instruction; Function And Operation; Send And Receive Program - Mitsubishi Electric MELSEC FX Series User Manual

FX communication

9. RS instruction

This section refers to the RS instruction. For target devices, refer to the application instruction
manual of each programmable controller.
9.1

Function and Operation

9.1.1

Send and Receive Program

An RS instruction sends and receives serial data via the RS-232C port (optional equipment).
X010
FNC 80
R S
• The data transmission format can be set using the special data register D8120.
Even if the setting of D8120 is modified while an RS instruction is driven, such modification
are not accepted.
• In a system in which a send operation is not performed, set the number of send points to
"K0".
In a system in which a receive operation is not performed, set the number of receive points to
"K0".
Supporting RS Instruction and Programming Protocol
When using the RS instruction in conjunction with a FX
232ADP, the user can switch between no protocol communication and the programming tool
(Programming Protocol) under the following conditions:
Accordingly, when data is received from the counterpart equipment while an RS instruction
remains OFF, "NAK" will be sent back to the counterpart equipment.
Programmable Controller and Version
V2.01 or more
FX
2N
All products (V2.01 or more)
FX
2NC
D200 D 0 D500
Read address Read address
and number of and number of
points of send points of receive
data data
Supporting Version
D 1
-232-BD or FX
2N
RS instruction 9
-232ADP, FX -
0N 2NC
9-1
9