Mitsubishi Electric MELSEC FX3U Programming Manual page 496

FX /FX /FX Series Programmable Controllers
3G 3U 3UC
Programming Manual - Basic & Applied Instruction Edition
Cautions
• Do not drive two or more RS (FNC 80) and/or RS2 (FNC 87) instructions for the same port at the same time.
• It is not permitted to use an RS (FNC 80)/RS2 (FNC 87) instruction and an IVCK (FNC270)/IVDR
(FNC271)/IVRD (FNC272)/IVWR (FNC273)/IVBWR (FNC274)/FLCRT (FNC300)/FLDEL (FNC301)/
FLWR (FNC302)/FLRD (FNC303)/FLCMD (FNC304)/FLSTRD (FNC305) instruction for the same port.
• When using a header and terminator, set the data in the header and terminator to corresponding devices
(D) before executing the RS2 instruction. Do not change the values of the header and terminator while the
RS2 instruction is being executed.
Function Changes According to Versions
Compatible Versions
FX3G
Ver. 1.00 or later Ver. 2.30 or later Ver. 2.30 or later
494
→ For other cautions, refer to the Data Communication Edition.
FX3U FX3UC
16 External FX Device – FNC 80 to FNC 89
16.8 FNC 87 – RS2 / Serial Communication 2
Item
ch1
Data Set Ready (DSR) Flag
ch2
Data Set Ready (DSR) Flag
Function Summary
Turns the special device M8405 ON
when the DR (DSR) signal of ch1 is
ON.
Turns the special device M8425 ON
when the DR (DSR) signal of ch2 is
ON.