FX
2N
-232IF RS232C INTERFACE BLOCK
HARDWARE MANUAL
JY992D73501B
This manual contains text, diagrams and explanations which will guide the reader in the correct installation
and operation of the FX
2N
-232IF RS232C Interface Block. It should be read and understood before
attempting to install or use the unit. Further information can be found in the FX PROGRAMMING MAN-
UAL, FX series hardware manuals.
If in doubt at any stage during the installation of the FX
2N
-232IF RS232C Interface Block always consult a
professional electrical engineer who is qualified and trained to the local and national standards.
1. INTRODUCTION
The RS232C interface block FX
2N
-232IF (hereinafter referred to as "232IF") is connected to the FX
2N
/
FX
2NC
/FX
3U
/FX
3UC
series PLC to realize full duplex serial data communication with another RS232C
interface such as a personal computer, bar code reader, printer, etc.
1) Two or more devices with RS232C interfaces can be connected to an FX
2N
/FX
2NC
/FX
3U
/FX
3UC
series
PLC by using the RS232C special function block. Up to 8 special function block can be connected to
the FX
2N
/FX
3U
/FX
3UC*1
series PLC. Up to 4 special function block can be connected to the FX
2NC
PLC. (Refer to section 2.1)
2) 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.
3) 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.
4) 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 FX
3UC
-32MT-LT PLC
2. Specifications
2.1 External Dimensions and Part Names
Dimensions:mm(inches)
Weight: Approx. 0.3 kg
Accessory:Special block No. label
POWER
RD
SD
24
+
24
-
➀
80(3.15")
mounting
hole
pitch
55(2.17")
4(0.16")
85(3.35")
POWER
RD
SD
FX -232IF
2N
90(3.54")
➁
➂ ➃ ➄
➉
➅
➈
➆
➇
c
Extension cable
d
Mounting hole (2-
φ
4.5(0.18"))
e
POWER LED :Lit when both the 5V DC power supplied from the main unit and the 24V DC power
supplied from the external terminal are supplied.
f
SD LED:Lit while data is sent to the RS232C equipment connected to the 232IF.
g
RD LED:Lit while data is received from the RS232C equipment connected to the 232IF.
h
Terminal screws (M3 (0.12"))
i
Next step extension connector
j
RS232C connector (9-pin D-SUB connector: #4-40unc inch screw thread)
k
DIN rail clip
l
DIN rail groove (35(1.38"))
2.2 Connector Pin Layout
1
2
3
4
5
9
8
7
6
*
< >
At selection of interlink connection mode
Pin No.
Signal name
Meaning
Function
1
CD(DCD)
Carrier detection
This signal indicates only status.
2
RD(RXD)
Receive data
Receive data (RS232C device to 232IF)
3
SD(TXD)
Send data
Send data (232IF to RS232C device)
4
ER(DTR)
Data terminal ready
ON when Send/Receive enable is ON
5
SG
Signal ground
Signal ground
6
DR(DSR)
Data set ready
This signal indicates only status.
7
RS(RTS)
Request to send
<Clear to receive>*
ON when Send command is ON
<ON when 232IF is Receive enabled>*
8
CS(CTS)
Clear to send
ON when RS232C device is ready to receive
9
CI(RI)
Calling indication
This signal indicates only status.
2.3 System Configuration
RS-232C device
Personal computer
Bar code reader
Printer
FX
2N
-232IF
RS-232C:max 15m
PLC
FX
2N
/FX
3U
PLC
FX
2NC
/FX
3UC
P
LC
To connect this block to the FX
2NC
Series
PLC, the FX
2NC
-CNV-IF is required
or
FX
2NC
-CNV-IF
To connect this block to the FX
3UC
Series
PLC, either the FX
2NC
-CNV-IF or FX
3UC
-
-1PS-5V is required.
FX
3UC
-1PS-5V
or
3. WIRING AND CONNECTION
3.1 Connection with the programmable controller
The 232IF can be connected to the FX
2N
/FX
2NC
/FX
3U
/FX
3UC
programmable controller or connected on
the right side of another extension block/unit. A number is assigned to each special unit/block counting
from the one nearest the main unit in the way of No.0, No.1. . . No.7". Up to 8 FX
2N
-232IF units can be
connected to the FX
2N
/FX
3U
/FX
3UC*1
Series PLC. Up to 4 FX
2N
-232IF units can be connected to the
FX
2NC
Series PLC. However, the capacity of the 5V DC power supplied from the programmable controller
is limited. The current consumption of the 5V DC power in the 232IF is 40 mA. Make sure that the total
current consumption of the 5V DC power supply including other special blocks is equivalent to or less than
that available.
*1 Up to 7 units can be connected to an FX
3UC
-32MT-LT PLC
FX -48MR-ES/UL
Block No.1
FX -232IF
FX -16EX-ES/UL
Block No.0
X000-X027
Y000-Y027
X030-X047
2N
FX -232IF
2N
2N
2N
FX -48MR
2N
MELSEC
7
6
27
20
22 23 24 25 26
21
16 17
14
17
15
10
12 13
7
2
4 5 6
1
3
0
27
20
22 23 24 25 26
21
16
11
IN
L
X5
X7
X13
X15
X17
X21
X23
X25
X4
X6
X10
X14
X16
X20
X22
X24
24+
N
COM
X0
X1
X2
COM4
Y24
Y25
COM5
Y27
COM2
Y4
Y5
Y6
Y7
COM3
Y10
Y13
COM1
Y0
Y2
Y3
Y14
Y15
Y20
Y21
Y22
Y23
Y26
P
OWER
T.V
C
P
U.E
P
ROG.E
P
OWER
R
D
S
D
P
OWER
R
D
S
D
1
IN 0
7
2
3
4
5
6
P
OWER
1
IN 0
7
2
3
4
5
6
1
IN 0
7
2
3
4
5
6
P
OWER
1
IN 0
7
2
3
4
5
6
3.2 Power Supply Wiring
Handling of the crimp-style terminal
Use the crimp-style terminals of the dimensions shown on the fig-
ure on the left. Make sure that the tightening torque of the terminal
is 0.5 to 0.8 N
y
m.
Tighten each terminal securely to avoid malfunction.
FX
2N
programmable
controller
Extension
cable
FX
2N
-232IF
DC service supply of
programmable controller
may be used.
DC service supply
Class D
grounding
100
Ω
or less
24V DC
±
10%
80mA
24+
24-
0V 24V
6.2mm
(0.24")
6.2mm
(0.24")
3.3 Connection Example
The signal wiring of the RS232C equipment varies depending on the RS232C specifications connected.
Check the specifications of the RS232C equipment used, then connect the signals correctly. Representa-
tive wiring examples are shown below.
1) Connection with counterpart equipment of terminal specifications (when control line is not used)
BFM #0 communication format: b9 = 0, b8 = 0, without control line
Communication is performed in accordance
with the condition determined by the soft-
ware in the 232IF and the counterpart equip-
ment.
232IF side
Signal
name
Pin
No.
SD(TXD)
3
RD(RXD)
2
SG(GND)
5
RS232C device side
Signal
name
9-pin
D-SUB
25-pin
D-SUB
SD(TXD)
3
2
RD(RXD)
2
3
SG(GND)
5
7
2) Connection with counterpart equipment of terminal specifications (when control line is used)
Cross cable used, BFM #0 communication format: b9 = 0, b8 = 1, standard RS232C mode
Because the carrier to send (CS) signal pin
of the 232IF itself receives the request to
send (RS) signal, signal transfer is per-
formed as if the counterpart equipment is
functioning.
*1 When the CD signal is not monitored, the
CD signal pin is not required to be con-
nected. The 232IF only monitors the sig-
nal status (ON/OFF).
*2 The 232IF only monitors the signal status
(ON/OFF).
232IF side
Signal
name
Pin
No.
SD(TXD)
3
RD(RXD)
2
RS(RTS)
7
CS(CTS)
8
CD(DCD)
1
ER(DTR)
4
DR(DSR)
6
SG(GND)
5
RS232C device side
Signal
name
9-pin
D-SUB
25-pin
D-SUB
SD(TXD)
3
2
RD(RXD)
2
3
RS(RTS)
7
4
CS(CTS)
8
5
CD(DCD)
1
8
ER(DTR)
4
20
DR(DSR)
6
6
SG(GND)
5
7
*1
*2
3) Interlink serial cross cable used,
BFM #0 communication format: b9 = 1, b8 = 1, RS232C interlink connection mode
In the interlink connection mo de, data
exceeding 512 bytes (upper limit of the
receive buffer in the 232IF) can be received.
*1 In this mode, the Request to Send signal
(RS) functions as the receive enable sig-
nal in the 232IF. When receiving data that
exceeds 512 bytes (the upper limit of the
232IF receive buffer), the 232IF sets the
Request to Send signal (RS) to “OFF”
and requests the counterpart equipment
to suspend the data transmission. Once
the data saved in the receive buffer is
r ea d by th e s e q u en c e p r o gra m , th e
remaining data can be received.
*2 The 232IF only monitors the signal status
(ON/OFF).
232IF side
Signal
name
Pin
No.
SD(TXD)
3
RD(RXD)
2
RS(RTS)
7
CS(CTS)
8
ER(DTR)
4
DR(DSR)
6
SG(GND)
5
RS232C device side
Signal
name
9-pin
D-SUB
25-pin
D-SUB
SD(TXD)
3
2
RD(RXD)
2
3
RS(RTS)
7
4
CS(CTS)
8
5
ER(DTR)
4
20
DR(DSR)
6
6
SG(GND)
5
7
*1
*2
4) Connection with counterpart equipment of modem specifications (Control line is essential.)
Straight cable used, BFM #0 communication format: b9 = 0, b8 = 1, standard RS232C mode
232IF side
Signal
name
Pin
No.
SD(TXD)
3
RD(RXD)
2
RS(RTS)
7
CS(CTS)
8
CD(DCD)
1
ER(DTR)
4
DR(DSR)
6
SG(GND)
5
CI(RI)
9
RS232C device side
Signal
name
9-pin
D-SUB
25-pin
D-SUB
SD(TXD)
3
2
RD(RXD)
2
3
RS(RTS)
7
4
CS(CTS)
8
5
CD(DCD)
1
8
ER(DTR)
4
20
DR(DSR)
6
6
SG(GND)
5
7
CI(RI)
9
22
*1 When the CD signal is not being moni-
tored, the CD signal pin is not required
to be connected. The 232IF only moni-
tors the signal status (ON/OFF).
*2 The 232IF only monitors the signal sta-
tus (ON/OFF).
*3 When the CI signal is not required, the
CI signal pin is not required to be con-
nected. The 232IF only monitors the
signal status (ON/OFF).
*1
*2
*3
