Casio EX-843 Service Manual page 24

COM 1, COM 2, COM 3
0 Carry out the COM port communication test.
0 Information of the loop back tool.
Pin assignment on the register side (male)
1
6
Connect the loop-back connector to the COM port to be tested.
1
Start the test by tapping the COM port to which the
loop-back connector is connected.
2
The COM port tile being tested turns to green, and
COM1: test result appears on menu screen.
COM2&3: judgement screen appears, then tap "OK" to return to menu screen.
3
The COM port tile being tested turns to red, and the display returns to the menu screen.
4
Pin
1
2
3
4
5
5
9
6
7
8
9
When the test result is "OK".
When the test result is "NG".
Signal name Connection information
DCD
RxD
TxD
DTR
GND
DSR
RTS
CTS
RI
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V-R200 / VER.2