IDEC MicroSmart - Manual (Page 424)

26: C OMPUTER L INK C OMMUNICATION
26-4 « FC4A M ICRO S MART U SER ’ S M ANUAL »
RS232C/RS485 Converter FC2A-MD1
The RS232C/RS485 converter FC2A-MD1 is used to convert data signals between EIA RS232C and EIA RS485. This
converter makes it possible to connect a host device with RS232C interface to multiple
MicroSmart CPU modules using
one cable.
Parts Description
Specifications
General Specifications
Serial Interface Specifications
Rated Power Voltage
Power terminals:
DC IN adapter jack: 24V DC ±20% (ripple 10% maximum)
9V DC, 350mA supplied from AC adapter
Current Draw Power terminals: Approx. 40 mA at the rated voltage
Operating Temperature 0 to 60°C
Storage Temperature –20 to +70°C
Operating Humidity 45 to 85% RH (no condensation)
Vibration Resistance 5 to 55 Hz, 60 m/sec 2 , 2 hours each in 3 axes
Shock Resistance 300 m/sec 2 , 3 shocks each in 3 axes
Dielectric Strength 1500V AC, 1 minute between live par ts and dead par ts
Insulation Resistance 10 M
Ω minimum between live parts and dead parts (500V DC megger)
Noise Resistance Power terminals: ±1 kV, 1 µs (using noise simulator)
Weight Approx. 550g
Standards in Compliance
EIA standard RS232C (D-sub 25-pin female connector)
EIA standard RS485 (screw terminals)
Communication Method Half-duplex
Communication Configuration 1:N (N ≤ 32)
Communication Cable Shielded twisted-pair cable
Communication Baud Rate 9600 bps (fixed)
Slave Stations 32 slave stations maximum (RS485 line)
Maximum Cable Length
RS232C: 15m (49.2 ft.)
RS485:
Total 200m (656 ft.)
RS232C
Signal Level
Conver ter
RS485
Signal Level
RS485 I/O
Termination Resistor
Transmit/Receive Data A
Transmit/Receive Data B
Signal Ground
Vcc (+24V)
GND
Power Indicator
Goes on when power is supplied
Transmit Data Indicator
Goes on when RS232C transmit data (pin #2) is on
Receive Data Indicator
Goes on when RS232C receive data (pin #3) is on
RS232C I/O
Connect to the RS232C por t on the computer
AC Adapter Jack
Frame Ground
Note: Connect 24V DC to POWER SUPPLY + and – terminals or connect an AC adapter with 9V DC, 350mA output to the AC
adapter jack.
Note: The FC2A-MD1 contains a 220
Ω termination resistor on the RS485 line, eliminating the need for an external termi-
nation resistor. To use the internal termination resistor, connect terminal T to terminal B. When the termination resistor is
not needed, disconnect terminal T from terminal B.
1
T
2
A
3
B
4
SG
5
FG
6
+
7
–
SD
RD
POWER
DC IN
RS485
SERIAL PORT
POWER SUPPLY
24V DC RS232C
SERIAL POR
T
RS232C/RS485
CONVERTER
Type FC2A-MD1