Sharp ER-A450T Service Manual page 5

7. RS232 Interface
Channel No.:
Channel No.:
Port 1(CH8)
Port 2(CH1)
1) Port 2 (CH1)
/CD
1
2 RD
3 SD
/ER on the Main PWB
4
5 GND
VCC
6 /DR
/RS
7
/CS
8
9
/CI
SW3
Pin No.9 : /CI signal (Default)
SW3
VCC /CI
3 1
Pin No.9 : Vcc(+5V) signal
VCC SW3 /CI
3 1
2) Port 1 (CH8)
1 /CD
2 RD
3 SD
4 /ER
5 GND
/DR
6
7 /RS
8 /CS
9
The No.9 pin signal of the Port 1 (CH8) can be selected between the
/CI signal and the +5V signal by changing the connection of the SW2
(initial value: /CI signal)
NOTE:
Optional bar code reader: When connecting an ER-A6HS1, connect
it to the Port 1 (or 2) and switch the No.9 pin signal to the +5V
signal.
When connecting other RS232 devices to either the Port 1 (or 2),
make sure the No.9 pin signal is proper before connecting the device.
If you want to connect an RS232 device to the ECR with the No.9
pin of the port 1 (or 2) set to +5V, make sure the AC cable of the
ECR is disconnected from the wall outlet to protect the device.
1 – 4
on the RS connector PWB
/CI
+5V
SW2
Pin No.9 : /CI signal (Default)
Pin No.9 : +5V signal