Mitsubishi FX-485PC-IF User manual

FX-485PC-IF RS485 Interface Unit Hardware Manual
This manual contains text, diagrams and explanations which will guide the reader in the correct installation and operation
of the FX-485PC-IF RS485 Interface Unit. It should be read and understood before attempting to install or use the unit.
Further information can be found in the FX Communication User’s manual.
If in doubt at any stage during the installation of the FX-485PC-IF Interface Unit always consult a professional electrical
engineer who is qualified and trained to the local and national standards.
1. Introduction
The interface unit FX-485PC-IF (hereinafter referred to as “485PC-IF”) can exchange signal of RS232C and RS485
(RS422) for computer link.
*1 Each programmable controller requires
necessary adaptor or unit for suporting
computer link.
For system configuration of computer link,
refer to FX communication user’s manual.
For A series, refer to A series manual.
1.1 External Dimensions
Dimensions: mm (inches) Weight: Approx. 0.3kg (0.66lbs) Accessories: Terminating resistor (330Ω × 2, 110Ω × 1)
a) RS232C connector: Used for connection between 485PC-IF and computer.
b) RD LED: Lit when the programmable controller sends data to the computer.
c) SD LED: Lit when the programmable controller receives data from the computer.
d) POWER LED: Lit when 5V is supplied to the power feed jack f).
e) Power supply cable grip: Safety grip to prevent disconnection of 5 V power supply.
f) Power feed jack: Jack for connecting power supply unit.
For using a plug with specifications, refer to section 3.2.
g) Terminal cover mounting screws (M3 (0.12"))
h) Terminal for RS422/485: Used in connection 485PC-IF and programmable controller(s).
Terminal Description
SDA This terminal is used when the programmable controller receives data
from the computer.
SDB
RDA This terminal is used when the programmable controller sends data to
the computer.
RDB
LINK SG Signal ground
485PC-IF FX,FX
0N
,FX
2N
,FX
2NC
,A
series programmable
controller(s)
*1
Computer
SDA SDB RDA RDB
100 (3.94") 30
(1.18")
80 (3.15")
RS-232C
LINK SG
RD
SD
POWER
MITSUBISHI
5 V DC
RS-422/485
a) b) c) d) e) f)
g)h)
FX-485PC-IF
1.2 RS232C Connector Pin Layout (D-SUB 25 Pin)
2. Wiring
Caution for wiring
• The terminal screws for the terminal block of the RS485 are M3 screws and therefore the crimp style terminal (see
drawing) suitable for use with these screws should be fitted to the cable for wiring.
• The terminal tightening torque is 0.5 to 0.8 Nm (5 to 8 kgf.cm), and tighten securely to avoid malfunction.
2.1 Connecting to a Computer (RS232C)
Note
RS (RTS) and CS (CTS), DR(DSR) and ER (DTR) signals are not used, but are connected inside the 485PC-IF, con-
nect wiring depending on the need of the computer.
2.2 Connecting to a Programmable Controller(s) (RS485/RS422)
2.2.1 Selection of Wiring
Wiring of RS485 is one-pair wiring or two-pair wiring. The wiring method is decided according to the usage. Please select the wir-
ing method from the table below.For message wait and on-demand function, please see FX Communication User’s Manual.
 ........Recommendation,  .........OK, ×.......... Can not use
*1 When using 485PC-IF with this wiring method remember to take account for/or ignore the “echo” of the commands sent from
computer.
Pin No. Signal Name Description
1NC No connection
2SD (TXD) Send data (485PC-IF →RS232C device(computer))
3RD (RXD) Receive data (RS232C device(computer) →485PC-IF)
4RS (RTS) No used (These pins are connected inside 485PC-IF. In some cases computer
may require connection.)
5CS (CTS)
6DR (DSR) No used (This pin is connected to ER (DTR) inside 485PC-IF. In some cases com-
puter may require connection.)
7SG Signal ground
8 to 19 NC No connection
20 ER (DTR) No used (This pin is connected to DR (DSR) inside 485PC-IF. In some cases
computer may require connection.)
21 to 25 NC No connection
Using Computer Link One-pair wiring
(Refer to section2.2.3) Two-pair wiring (Refer to section2.2.2)
If is necessary to set the message wait to 70ms or less ×

If is not necessary to set the message wait to 70ms or less

*1

Use on-demand function ×

12345678910111213
25 24 23 22 21 2019 18 17 16 15 14
6.2 mm (0.24" )
or less
For M3 (0.12") 6.2 mm (0.24")
or less
For M3 (0.12") Dimensions: mm (inches)
SD (TXD)
RD (RXD)
RS (RTS)
CS (CTS)
DR (DSR)
SG
ER (DTR)
Signal Name Pin No.
2
3
4
5
6
7
20
485PC-IF
SD (TXD)
RD (RXD)
RS (RTS)
CS (CTS)
DR (DSR)
SG
ER (DTR)
Signal Name
Computer
JY992D81801A
Date: 1999 September

HEAD OFFICE : MITSUBISHI DENKI BLDG MARUNOUTI TOKYO 100-8310 TELEX : J24532 CABLE MELCO TOKYO
HIMEJI WORKS : 840, CHIYODA CHO, HIMEJI, JAPAN
Specifications are subject to change without notice
2.2.2 Two-pair Wiring
*1 R is the terminating resistor. Connect the terminating resistor (330Ω) between terminals SDA and SDB, and terminals RDA
and RDB.
*2 The shield of the shielded twisted-pair cable must be connected to ground (100Ωor less). When using parallel link, ground
both side. When using no protocol or dedicated protocol, ground one side.
*3 Connect terminal FG to each terminal of the programmable controller main body grounded with resistance of 100Ωor less.
However, for the computer link unit of the A series programmable controller, see the manual of the computer link unit.
2.2.3 One-pair Wiring
*1 R is the terminating resistor. Connect the terminating resistor (110Ω) between terminals RDA and RDB.
*2 The shield of the shielded twisted-pair cable must be connected to ground (100Ωor less).
*3 Connect terminal FG to each terminal of the programmable controller main body grounded with resistance of 100Ωor less.
However, for the computer link unit of the A series programmable controller, see the manual of the computer link unit.
3. Specifications
3.1 General Specifications
General specifications other than the those-mentioned below are the same as for the FX or FX2N series programmable controller.
Items Description
Dielectric withstand voltage 500 V AC > 1 min, tested between terminals in batch and case
Insulation Resistance 5 MΩ> 500 V DC, tested between terminals in batch and case
Grounding of resistance 100
Ω
or less
R*1
R*1
SDA
SDB
RDA
RDB
SDA
SDB
RDA
RDB
SG
SDA
SDB
RD
A
RD
B
LINK
SG
*3
FG
SDA
SDB
RDA
RDB
SG
*3
FG
R*1
R*1
485PC-IF FX
2N
-485-BD FX
(0N)
-485ADP A series programmable
controllers computer link unit
'
LINK SG
*2
Grounding of resistance 100
Ω
or less
R*1
SDA
SDB
RDA
RDB
SDA
SDB
RDA
RDB
SG
SDA
SDB
RDA
RDB
LINK
SG
*3
FG
SDA
SDB
RDA
RDB
SG
*3
FG
R*1
LINK SG
*2
485PC-IF FX
2N
-485-BD FX
(0N)
-485ADP A series programmable
controllers computer link unit
3.2 Power Supply Specifications
Note
Use a plug with specifications as shown right.
3.3 Performance Specifications
4. Diagnostics
For diagnostics of computer link, please see FX Communication User’s Manual.
4.1 POWER LED Check
4.2 SD LED and RD LED Check
Check the status of the SD LED and the RD LED.
Items Description
Power source 5 V DC ± 5%
Current consumption Max. 260 mA
Items Description
Transmis-
sion standard RS232C Conforming to RS232C
RS485/422 Conforming to RS485 and RS232C
Communication method Full-duplex communication
transmission
distance RS232C Max. 15 m
RS485/422 Max. 500 m
Supported baud rate 300 to 19,200 bps
Isolation Photo coupler isolation and transformer isolation
(between programmable controller and communication signal)
LED Status Description
Lit Power source is OK.
Otherwise Check power supply unit and connection.
Location LED Status Check Point
Sending data form computer to
programmable controller(s).
SD LED is lit Wiring between computer and 485PC-IF is OK.
SD LED is not lit Check wiring between computer and 485PC-IF. Check that data has been
sent from computer.
Sending data form programma-
ble controller to computer.
RD LED is lit Wiring between programmable controller and 485PC-IF is OK.
RD LED is not lit Check wiring between programmable controller and 485PC-IF. Check set-
ting of programmable controller(s) for computer link.
Dimensions: mm (inches)
φ 5.5(0.22")
φ 2.1(0.08")
9.5 (0.37")
Guidelines for the safety of the user and protection of the FX-485PC-IF RS485 Interface Unit
• This manual has been written to be used by trained and competent personnel. This is defined by the European directives for
machinery, low voltage and EMC.
• If in doubt at anystage during the installationof the FX-485PC-IF always consult a professionalelectrical engineer who is qualified
and trained to the local and national standards. If in doubt about the operation or use of theFX-485PC-IF please consult the near-
est Mitsubishi Electric distributor.
• Under no circumstances will Mitsubishi Electric be liable or responsible for anyconsequential damage that may arise as a result of
the installation or use of this equipment.
• All examples and diagrams shown in this manual are intended only as an aid to understanding the text, not to guarantee opera-
tion. Mitsubishi Electric will accept no responsibility for actual use of the product based on these illustrative examples.
• Owing to the very great variety in possible application of this equipment, you must satisfy yourself as to its suitability for your spe-
cific application.