Casio QT-6600 Service Manual page 71

[ 24 ] COM (RS232C) Batch Test
[Function]
Performs a loop back batch test on RS232C port.
When performing this test, attach the loop back connecters to all COM ports.
Please see below for how to wire.
[Operation]
Operation : 4
Baud rate: COM1: 115 kbps, COM2-6: 19.2 kbps
Number of test: once (fixed)
[LCD]
COM BATCH
.
.
.
END
COM1
T x D
R x D
C T S
R T S
D T R
DSR
C D
C I
0 ST
40
40
Figure : RS232C port connection
COM2~COM6
T x D
R x D
C T S
∗
R T S
D T R
DSR
∗
∗
: output "1" � "0" from the output terminal and checks the input terminal.
— 68 —
Refer to the previous paragraph "COM Test."
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