®
RKC INSTRUMENT INC.
The first edition: MAY 2015 [IMQ00]
HEADQUARTERS: 16-6, KUGAHARA 5-CHOME, OHTA-KU TOKYO 146-8515 JAPAN
PHONE: 03-3751-9799 (+81 3 3751 9799)
E-mail: [email protected]
FAX:
03-3751-8585 (+81 3 3751 8585)
Website: http://www.rkcinst.com/
MAY 2015
Company names and product names used in this manual are the trademarks or registered
trademarks of the respective companies.
4. WIRING
Wiring Cautions
To avoid noise induction, keep communication signal wire away
from instrument power line, load lines and power lines of other
electric equipment.
If the personal computer is easily affected by noise, use the
ferrite core in the USB cable. For an installation position of a
ferrite core, please refer to the following figure.
Ferrite core * (sold separately)
* Recommended ferrite core:
ZCAT2032-0930 (TDK Corporation)
USB cable
Method to connect
(1) For loader communication
W-BV-01 loader communication cable:
It is possible to use COM-K2 when controller is either ON or
OFF. COM-K2 starts supplying power to the connected
controller being OFF after approximately 2 seconds.
W-BV-03 loader communication cable:
Controller should be always ON to use with COM-K2.
Display of controller (RKC product) being powered by COM-K2
:
FB series,
RB series etc.
Displays “-----” at the PV/SV monitor display.
PF900/901
Lights all State monitor lamps: RESET, RUN,
FIX, MAN, HOLD, STEP.SET and PTN.END.
Other displays and lamps are OFF.
(2) For RS-485/RS-422A communication
The shielded twisted pair wire must be provided by the customer.
Connector pin configuration
1 2 3 4 5
RS-485/RS-422A
communication
connector
[RS-485] [RS-422A]
Pin No. Signal name
Symbol
Pin No.
Signal name Symbol
1
Signal ground
SG
1
Signal ground
SG
2
Send data/
Receive data
T/R (A)
2
Send data
T (A)
3
Send data/
Receive data
T/R (B)
3
Send data
T (B)
4 *
Unused
4
Receive data
R (A)
5 *
Unused
5
Receive data
R (B)
* Do not connect wires to 4 and 5 pins. Malfunction may result.
Connection diagram
[RS-485]
[RS-422A]
* The termination resistor is built into the COM-K2.
Attention in connector wiring
The lead wires use the stranded wire.
Use the stranded wire from size 0.25 to 0.5 mm
2
(AWG 26-20).
Stripping length is as follows.
8 mm (Stripping length)
Conductor cross section:
0.25 to 0.5 mm
2
(AWG 26-20)
Connector type:
FK-MC
0,5/5-ST-2,5
(Products by Phoenix
contact
Ltd.)
Installation of USB device driver
For installing the USB driver, refer to the following instruction manuals.
The manuals can be downloaded from the official RKC website.
Installation of USB driver for COM-K2 communication converter (IMT01D13-E
)
USB Communication Converter COM-K2 USB Driver Installation Manual
(IMT01D12-E
)
5. SPECIFICATIONS
USB function
Interface:
Based on USB Ver. 2.0
Communication speed: Full speed (12 Mbps)
Connection:
Connected by universal USB cable
(Mini-B connector)
Power source method: Bus power (The power is supplied from the
USB port on the personal computer side)
Compatible OS:
Windows XP */Windows Vista */Windows 7 *
/Windows 8 */Windows 8.1 *
*32-bit/64-bit
Communication function
Interface:
Based on RS-485, EIA standard
Based on RS-422A, EIA standard
Connection method:
2-wire system,
half-duplex multi-drop connection (RS-485)
4-wire system,
half-duplex multi-drop connection (RS-422A)
Synchronous method: Half-duplex start-stop synchronous type
Communication speed: 2400 bps, 4800 bps, 9600 bps, 19200 bps,
38400 bps
Data bit configuration: Start bit: 1
Data bit: 7 or 8
Parity bit: Without, Odd or Even
Stop bit: 1 or 2
Protocol:
Protocol depends on application of the
personal computer side
Number of connecting controllers
Maximum 31 controllers (RS-485, RS-422A)
Termination resistor:
Built-in termination resistor (120
)
General specifications
Power supply voltage: 5 V DC
5
(Supplied by USB bus cable)
Current consumption: 150 mA max. (Loader communication)
60 mA max. (RS-485/RS-422A communication)
Allowable ambient temperature range:
10 to
50
C
Allowable ambient humidity range:
5 to 95 %RH (Non condensing)
Absolute humidity:
MAX.W.C 29.3 g/m
3
dry air at 101.3 kPa
Weight:
Approx. 40 g (Instrument only)
To prevent electric shock or instrument failure, turn off the
power before connecting or disconnecting the instrument
and peripheral equipment.
!
WARNING
RS-485/RS-422A
Connected to USB
port of a personal
computer
Connected to communication
terminals of controller
(Example: FB400/900)
Connected to USB connector
Connected to
RS-485/RS-422A
communication
connector
COM-K2
Shielded twisted pair wire
USB cable
Connected to loader communication connector
of the controller (Example: FB400/900)
Connected to USB
port of a personal
computer
Connected to USB connector
Connected to loader
communication
connector
Loader communication
cable [Optional]
W-BV-01 or W-BV-03
USB cable
COM-K2
Shielded twisted
pair wire
Controller
(Example: FB400/900)
RS-485/RS-422A
communication
connector
Communication terminals
(Communication 1 side)
R: Termination resistors (Example: 120
1/2 W)
If communication errors occur frequently due to
the operation environment or the communication
distance, connect termination resistors.
T/R (A)
T/R (B)
1
SG
2
R
COM-K2*
3
4
5
25 SG
26
27
T/R (A)
T/R (B)
Shielded twisted
pair wire
Controller
(Example: FB400/900)
RS-485/RS-422A
communication
connector
Communication terminals
(Communication 1 side)
T (A)
R (A)
1
SG
2
COM-K2*
3
4
5
T (A)
R (A)
25 SG
26
27
28
29
T (B)
R (B)
T (B)
R (B)
