Manuals > Device Connection Guide > Mitsubishi Electric > Open Protocol (RS-232C) > FX2 Series

overview

This is a setting example for connecting the FX2 series to RS-232C. In this setting example, an RS-422 conversion adapter is used to connect to the RS-232C.

Model used

item	Model etc.
PLC	FX2-16MR
Communication Unit	FX-485ADP + FX-485PC-IF (RS-422 → RS-232C conversion)

Configuration environment

item	environment
OS	Windows7 Professional 64Bit

Configuration details

item	setting	Setting items	Configuration Example
PLC side settings	Set with tools	Transmission speed	19200bps
		Byte Size	7-bit
		Stop bits	1 bit
		Odd/Even Parity	Even
		Sum Check Code	can be
		protocol	MC Protocol (Format 1)
		Area code	0
PC settings	Unit Settings	COMPort	Communication port number to connect to
		Transmission speed	19200bps
		Byte Size	7bits
		Stop bits	1bits
		parity	Even
		Sum Check	can be
	Folder and communication test settings	PC Number	FF
	Folder and communication test settings	Area code	00

* Most of the settings on the computer will be adjusted to match the settings on the unit.

PLC side settings

The transmission control procedure for "FX-485ADP" is set using the special register "D8120". In this case, set it to "24726" in decimal. The station number is set in the special register "D8121". Set the value using GX-Developer or similar.

1.Verify that you can connect to the PLC using GX-Developer

2.From the device batch monitoring screen, write "24726" to "D8120"
c_plc_0094

The settings for the values to be written are as follows:

D8120 bits	explanation	Setting contents
0th bit	Data Length ※The setting on the right is "7Bit"	0
1st bit	parity ※The setting on the right is "Even"	1
2nd bit	parity ※The setting on the right is "Even"	1
3rd bit	Stop bits ※The setting on the right is "1Bit"	0
4th bit	Porate *The setting on the right is "19200bps"	1
5th bit		0
6th bit		0
7th bit		1
8th bit	header * Set to "None" on the right	0
9th bit	terminator * Set to "None" on the right	0
10th bit	Control Line *The setting on the right is "Use computer link RS-232C"	0
11th bit		0
12th bit	Not available	0
13th bit	Sum Check ※Select "Add" in the settings on the right	1
14th bit	protocol * Select "Use" in the settings on the right	1
15th bit	Control Procedure *Settings on the right are "Format 1"	0

*The setting value in the table above, "0110 0000 1001 0110", becomes "24726" when converted to a decimal number.

3.Write "0" to "D8121" from the device batch monitoring screen.
c_plc_0095

For details on the settings, etc., please refer to the Mitsubishi Electric "FX Series Micro Sequencer" User's Manual.

PC settings

Use the Server application to connect to the PLC for which you have set up communications.

1.Right-click "Application" - "Driver" in the tree and select Add Driver.

2.Select the following units from the displayed driver list and add them:
When connecting to the FX0 series, select the "MELSEC-FX0 series" driver.
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3.Open the properties of the added unit (U01) and click Communication Settings.
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4.Set "Communication Settings" as follows:
c_plc_0064

setting	Setting contents
COMPort	Communication port number to connect to
Transmission speed	19200
Byte Size	7bits
Stop bits	1bits
parity	Even

5.Open "Other settings" and set it as follows:
c_plc_0065

setting	Setting contents
Sum Check	Check it
protocol	Format 1

6.USB-RS-If you are using a 232C conversion cable, the COM port may be locked in the event of a communication error, so check the reopen setting.
c_plc_0068

7.Perform a connection test to check the connection
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If a message such as "Connection OK" is displayed, the connection is confirmed to be OK.

Connection example [FX2 series]

Connection example [FX2 series]