Casio FE-700 MEX Service Manual page 24

4) RS232C port test
This test will execute the RS232C loop back test continuously using loop back connector.
In case an error happens, the machine issues an error receipt then stop this test.
Test description :
1 : Level check at DSR signal ( Low/High)
2 : Send the data (0A5h) from TxD and receive it at RxD terminal.
To stop this test, turn the mode switch to "OFF" position.
Opeartion : 2
[PRINT]
Normal End
232C OK
5) All charactor print test
This test will print the all charactors inside printer controller.
Opeartion : 8 #2
[PRINT]
#
6) Time display test
This test will display the time until pressing the C key.
Opeartion : 9 #2 Key
0 7 #2 Key
Key
8
Loop back connection:
Error End
232C ER
X : Error code
0 : Time over
1 : Over run error
2 : Framing error
3 : RXD line data error
4 : DSR line receive error
— 22 —
TxD 2
RxD 3
DSR 6
X
[DISPLAY]
[DISPLAY]