Casio SE-S300 Service Manual page 36

[ 21 ] RS232C PORT BATCH TEST
[Function]
This is the RS232C port batch test.
When performing this test, fix loop back connectors to all COM ports.
By the setting below, the loop back batch test is performed once from COM1 through COM2.
[Operation]
Operation : 4
Baud rate:
Check time:
[Print]
COM BATCH
COM BATCH
RTS1=1 -- > CTS1=1
DTR1=1 -- > DSR1=1
RTS1=0 --> CTS1=0
DTR1=0 --> DSR1=0
TxD --> RxD
RTS2=1 --> CTS2=1
RTS2=0 --> CTS2=0
DTR2=0 --> DSR2=0
TxD --> RxD
END
COM1/2
TxD
RxD
RTS
CTS
DTR
DSR
0 SUB TOTAL
COM1: 19.2 kbps, COM 2: 9600 bps
one time
40
OK
OK
OK COM1
OK
OK
OK
OK
COM2
OK
OK
40
Figure : RS232C port connection
outputs "1" R "0" from the output terminal and checks the input terminal.
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