Instruction manual

2
2. Wiring connection
Serial communication (option C5)
When using communication converter IF-300-C5
• Connector: D sub 25-pin
Connection: RS-232C RS-485 (Communication speed: 2400, 4800, 9600, 19200bps)
(Fig. 2-1)
• Connector: D sub 9-pin
Connection: RS-232C RS-485 (Communication speed: 2400, 4800, 9600, 19200bps)
(Fig. 2-2)
Shield wire
Connect only one side of the shield wire to the FG or GND terminal so that current cannot flow to
the shield wire.
(If both sides of the shield wire are connected to the FG or GND terminal, the circuit will be closed
between the shield wire and the ground. As a result, current will run through the shield wire and this
may cause noise.)
Never fail to ground FG and GND terminals.
Terminator (Terminal resistor)
Communication converter IF-300-C5 (sold separately) has a built-in terminator.
The terminator is mounted at the end of the wire when connecting a personal computer with multiple
peripheral devices. The terminator prevents signal reflection and disturbance.
Do not connect a terminator with the communication line because the PCD-33A has built-in pull-up
and pull-down resistors instead of a terminator.
TXD
RXD
SG
FG
RTS
CTS
DSR
DTR
CD
2
3
7
1
4
5
6
20
8
SG
RX
TX
COM
SG
RS-232C RS-485
YA (-)
YB (+)
YA (-)
YB (+)
Shield wire
PCD-33A
YA (-)
YB (+)
COM
Shield wire
Host
computer
D sub connector 25-pin
11
1
2
5
4
6
14
IF-300-C5
14
11
11
17
17
120 built-in terminator
PCD-33AIF-300-C5
RXD
TXD
DCD
DTR
DSR
RTS
CTS
2
3
5
1
4
6
7
8
SG
SG
YA (-)
YB (+)
YA (-)
YB (+)
GND
RI
9
RS-232C RS-485
Shield wire
Shield wire
Host computer
D sub connector 9-pin
YA (-)
YB (+)
COM
11
1
2
RX
TX
COM
5
4
6
120 built-in terminator
14
11
17
14
11
17