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

overview

This is a setting example when connecting to the QnA series via RS-232C.

Model used

item	Model etc.
PLC	Q2ACPU
Communication Unit	AJ71QC24

Configuration environment

item	environment
OS	Windows7 Professional 64Bit

Configuration details

item	setting	Setting items	Configuration Example
PLC side settings	Set with switch	Area code	0
		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)
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
		protocol	Format 1
	Folder and communication test settings	Area code	00
		Network Number	00
		PC Number	FF
		Request unit I/O number	03FF
		Request destination unit station number	00
		Your number	00

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

PLC side settings

Set the settings to "AJ71QC24". Settings are made using the front switch.

1.Set the switch as follows:

c_plc_0088

switch	explanation	Setting contents
STATION No (x10)	Setting your own area code (10th place)	0
STATION No (x1)	Setting your own area code (1st digit)	0
CH1.Mode	Mode Setting ※Settings on the right are "Format 1"	1
CH1.SW01	Operational Settings *The setting on the right is "independent operation"	OFF
CH1.SW02	Data Bits Settings *The setting on the right is "7 bit"	OFF
CH1.SW03	Parity bit presence/absence *The setting on the right is "Yes"	ON
CH1.SW04	Even/Odd Parity Settings ※The setting on the right is "Even"	ON
CH1.SW05	Stop bit setting *The setting on the right is "1 bit"	OFF
CH1.SW06	Sum check presence/absence *The setting on the right is "Yes"	ON
CH1.SW07	RUN Write enable/disable setting *The setting on the right is "Yes"	ON
CH1.SW08	Settings can be changed/cannot be changed *"Changeable" in the settings on the right	ON
CH1.SW09	Transmission speed setting *The setting on the right is "19200bps"	OFF
CH1.SW10		ON
CH1.SW11		ON
CH1.SW12		OFF

*In this example, only CH1 is configured.

RS-232C cable precautions

The default setting for the "AJ71QC21" is "No CD terminal check." If you want to perform a CD terminal check, you will need to add one line to your ladder program. For details, see the "Serial Communication Unit" User's Manual (Details).

For details on the switch settings, etc., please refer to the Mitsubishi Electric "AJ71QC24 Serial Communications Unit" User's Manual (Hardware Edition).

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:
c_plc_0087

3.Open the properties of the added unit (U01) and click Communication Settings.
c_plc_0086

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
c_plc_0067

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

Connection example [QnA series]

Connection example [QnA series]