Casio QT-2100 Service Manual page 50

[ 14 ] RS232C port test
This test will check the RS232C port. Connect the loop back connector before this test.
Operation : x n 0
x : Baud rate selection
1 = 4800 bps 2 = 9600 bps 3 = 19.2 kbps 7 = 115 kbps (com1 only)
n : 0 = One time check
Not 0 = Continuous check (To stop the test, press "Esc" key )
d : Port selection
1 = COM1
5 = COM5
[ LCD ]
(COM1 test)
COM1
RTS1=1 --> CTS1=1
DTR1=1 --> DSR1=1
DTR1=1 --> CD1=1
DTR1=1 --> CI1=1
RTS1=1 --> CTS1=1
DTR1=1 --> DSR1=1
DTR1=1 --> CD1=1
DTR1=1 --> CI1=1
TXD --> RXD
END
[ LOOP BACK CONNECTOR]
COM1
3pin
TxD
2pin
RxD
8pin
CTS
7pin
RTS
4pin
DTR
6pin
DSR
1pin
CD
9pin
CI
4 d SUBTOTAL
2 = COM2 3 = COM3
6 = COM6
41
OK
OK
OK
OK
OK
OK
OK
OK
OK
41
COM2~COM6
3pin
TxD
2pin
RxD
8pin
CTS
7pin
RTS
4pin
DTR
6pin
DSR
— 48 —
4 = COM4
There are only COM1 display.