he RS232C interface block FX2N-232IF (hereinafter referred to as "232IF") is connected to the FX2N/
X2NC/FX3U/FX3UC series PLC to realize full duplex serial data communication with another RS232C
terface such as a personal computer, bar code reader, printer, etc.
Two or more devices with RS232C interfaces can be connected to an FX2N/FX2NC/FX3U/FX3UC series
PLC by using the RS232C special function block. Up to 8 special function block can be connected to
the FX2N/FX3U/FX3UC*1
series PLC. Up to 4 special function block can be connected to the FX2NC
PLC. (Refer to section 2.1)
Communication requires no protocol
Full-duplex asynchronous communication between RS232C devices is specified through buffer mem-
ory (BFM). The FROM/TO instruction is used for the buffer memory.
The send/receive buffer can accommodate 512 bytes/256 words.
When the RS232C interlink connection mode is used, data exceeding 512 bytes/256 words can also
can be received.
ASCII/HEX conversion function
The function to convert and send and a hexadecimal numeric (0 to F) saved in the send data buffer as
well as the function to convert a received ASCII code into a hexadecimal numeric (0 to F) and save it
to the receive buffer are provided.
1 Up to 7 special function block can be connected to the FX3UC-32MT-LT PLC