Sharp UP-3301 Service Manual page 29

1) CHANNEL Check
1 Check content
The CHANNEL setting of the connected RS232 is displayed. The
display content and the setting of the DIP SW for CHANNEL setting
on the RS232 I/F PWB are compared.
Since the RS232 and printer port on the main PWB of the UP-
3301 is fixed to CH1, CH2 and CH7. The ER-A7RS2 must be set
to CH3~CH6.
RS232 I/F Diagnostic
CHANNEL Check
←Display when the channel exists
CH1 = exist!
CH2 = exist!
←Display when the channel doesn't exist
CH3 = none!
CH4 = none!
CH5 = none!
CH6 = none!
CH7 = exist!
CH8 = exist!
(Reference) ER-A7RS2 CHANNEL setting (In the table below, "1" =
SW OFF, "0" = SW ON.)
ER-A7RS2 CON3
S1-1 S1-2 S1-3
0 0 0 Invalid
0 0 1 CHANNEL 1: Do not set this
0 1 0 CHANNEL 2: Do not set this (Reserved)
0 1 1 CHANNEL 3
1 0 0 CHANNEL 4
1 0 1 CHANNEL 5
1 1 0 CHANNEL 6:
1 1 1 CHANNEL 7: Do not set this
ER-A7RS2 CON4
S1-4 S1-5 S1-6
0 0 0 Invalid
0 0 1 CHANNEL 1: Do not set this
0 1 0 CHANNEL 2: Do not set this (Reserved)
0 1 1 CHANNEL 3
1 0 0 CHANNEL 4
1 0 1 CHANNEL 5
1 1 0 CHANNEL 6:
1 1 1 CHANNEL 7: Do not set this
2 Terminating procedure
Press the Touch panel to terminate the check.
CHANNEL
(Reserved for
standard RS)
(Reserved for
internal printer)
CHANNEL
(Reserved for
standard RS)
(Reserved for
internal printer)
UP-3301US DIAGNOSTICS SPECIFICATIONS
– 27 –
2) CH1 Check
1 Check content
When the loop back connector is not set, an error is displayed
(ERROR:CH1). When the loop back connector is set, the following
check is performed.
• Control signal check
ERn RSn DRn
OFF OFF OFF
OFF ON OFF
ON OFF ON
ON ON ON
The read check of the above inputs and the interruption check of CS,
CI, and CD are performed.
In the read check, ER and RS are changed over in the above
sequence and the logic states of DR, CI, CD, and CS are checked.
If the logic differs from that in the table, an error display is made.
"ON" in the table means Active LOW, and "OFF" means Active HIGH.
In the interruption check, an interruption of CS, CI, or CD is allowed
one by one. (The MASK is canceled.)
If an interruption is not made when each signal is active, or if an inter-
ruption is made when each signal is not active, an error display is
made.
The above check is repeated in four cycles.
• Data transfer check
The loop back data (256 bytes) of 00H~0FFH are used for the data
transfer check. The baud rate is set to 38400BPS.
• Timer check (RS232 on board timer)
Before performing the check, set the timer to TCVDT start and 5ms.
Then perform the following procedure.
*During execution of the test, TRQ- must not be generated.
*After 5ms from completion of the check, TRQ- must be generated.
2 Display
RS232 CH1 Check
ER-DR : ERROR!!
CIn CDn CSn
OFF OFF OFF
OFF ON ON
ON OFF OFF
ON ON ON