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
232IF side
Signal
Pin
name
No.
SD(TXD)
3
RD(RXD)
2
SG(GND)
5
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
232IF side
Signal
Pin
name
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
3) Interlink serial cross cable used,
BFM #0 communication format: b9 = 1, b8 = 1, RS232C interlink connection mode
232IF side
Signal
Pin
name
No.
SD(TXD)
3
RD(RXD)
2
RS(RTS)
7
CS(CTS)
8
ER(DTR)
4
DR(DSR)
6
SG(GND)
5
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
Pin
name
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
9-pin
Signal
name
D-SUB
SD(TXD)
RD(RXD)
SG(GND)
RS232C device side
9-pin
Signal
name
D-SUB
SD(TXD)
RD(RXD)
RS(RTS)
CS(CTS)
*1
CD(DCD)
ER(DTR)
DR(DSR)
*2
SG(GND)
RS232C device side
9-pin
Signal
name
D-SUB
SD(TXD)
RD(RXD)
RS(RTS)
*1
CS(CTS)
ER(DTR)
DR(DSR)
*2
SG(GND)
RS232C device side
9-pin
Signal
name
D-SUB
SD(TXD)
RD(RXD)
RS(RTS)
CS(CTS)
*1
CD(DCD)
ER(DTR)
*2
DR(DSR)
SG(GND)
*3
CI(RI)
Communication is performed in accordance
with the condition determined by the soft-
ware in the 232IF and the counterpart equip-
25-pin
ment.
D-SUB
3
2
2
3
5
7
Because the carrier to send (CS) signal pin
of the 232IF itself receives the request to
send (RS) signal, signal transfer is per-
25-pin
formed as if the counterpart equipment is
D-SUB
functioning.
3
2
*1 When the CD signal is not monitored, the
2
3
7
4
8
5
*2 The 232IF only monitors the signal status
1
8
4
20
6
6
5
7
In the interlink connection mode, data
exceeding 512 bytes (upper limit of the
receive buffer in the 232IF) can be received.
25-pin
D-SUB
*1 In this mode, the Request to Send signal
3
2
2
3
7
4
8
5
4
20
6
6
5
7
*2 The 232IF only monitors the signal status
*1 When the CD signal is not being moni-
25-pin
D-SUB
3
2
*2 The 232IF only monitors the signal sta-
2
3
*3 When the CI signal is not required, the
7
4
8
5
1
8
4
20
6
6
5
7
9
22
CD signal pin is not required to be con-
nected. The 232IF only monitors the sig-
nal status (ON/OFF).
(ON/OFF).
(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
read by the sequence program, the
remaining data can be received.
(ON/OFF).
tored, the CD signal pin is not required
to be connected. The 232IF only moni-
tors the signal status (ON/OFF).
tus (ON/OFF).
CI signal pin is not required to be con-
nected. The 232IF only monitors the
signal status (ON/OFF).
