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 (330
Ω ×
2, 110
Ω ×
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
485P C -IF
F X ,F X
0N
,F X
2N
,F X
2N C
,A
series pro gram m able
controller(s)
*1
C om puter
S D A S D B R D A R D B
100 (3.94")
30
(1.18")
80 (
3
.15")
R
S
-232C
LINK SG
R D
S D
P O W E R
M IT S U B IS H I
5 V
D
C
R S -4 2 2 /4 8 5
a)
b)
c)
d)
e)
f)
g)
h)
F X-485P C -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
1
NC
No connection
2
SD (TXD)
Send data (485PC-IF
→
RS232C device(computer))
3
RD (RXD)
Receive data (RS232C device(computer)
→
485PC-IF)
4
RS (RTS)
No used (These pins are connected inside 485PC-IF. In some cases computer
may require connection.)
5
CS (CTS)
6
DR (DSR)
No used (This pin is connected to ER (DTR) inside 485PC-IF. In some cases com-
puter may require connection.)
7
SG
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
×
1
2
3
4
5
6
7
8
9
10
11
12
13
25
24
23
22
21
20
19
18
17
16
15
14
6.2 m m (0.2 4" )
or less
F or M 3 (0.1 2")
6.2 m m (0.2 4")
or less
F or M 3 (0.1 2")
D im ensions : m m (inches)
S D (T X D )
R D (R X D )
R S (R T S )
C S (C T S )
D R (D S R )
S G
E R (D T R )
S ignal N am e
P in N o.
2
3
4
5
6
7
20
485P C -IF
S D (T X D )
R D (R X D )
R S (R T S )
C S (C T S )
D R (D S R )
S G
E R (D T R )
S ignal N am e
C om puter
JY992D81801A
Date: 1999 September
