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Sharp ER-A770 Service Manual Page 21

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(Reference) ER-A7RS CHANNEL setting (In the table below, "1" =
SW OFF, "0" = SW ON.)
ER-A7RS CON3
S1-1 S1-2 S1-3 LOGICAL CHANNEL
0 0 0 Invalid
0 0 1 CHANNEL 1: Impossible to set
0 1 0 CHANNEL 2:
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
ER-A7RS CON3
S1-4 S1-5 S1-6 LOGICAL CHANNEL
0 0 0 Invalid
0 0 1 CHANNEL 1: Impossible to set
0 1 0 CHANNEL 2
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
Terminating procedure
Press the CANCEL key to terminate the check.
2) CH1 Check
Check content
When the channel is not set, an error display is made (ER-
ROR:CH1). When the channel is set, the following check is performed.
• Control signal check
ERn RSn DRn CIn CDn CSn
OFF OFF OFF OFF OFF OFF
OFF ON OFF OFF ON ON
ON OFF ON ON OFF OFF
ON ON 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. (MASK is canceled.)
If an interruption is not made when each signal is active, or if an
interruption is made when each signal is not active, an error
display is made.
The above check is repeated four cycles.
• Data transfer check
The loop back data (256 bytes) of 00H ~ 0FFH are used for
data transfer check. The baud rate is set to 38400BPS.
• Timer check (RS232 on board timer)
Before performing the check, set the timer to RCVDT start and
5ms. Then perform the following procedure.
During execution of the check, TRQ- must not be generated.
After 5ms from completion of the check, TRQ- must be gener-
ated.
Display
All the contents of an error must be displayed.
ERROR
No.
ERROR display ERROR content
1 ER-DR:ERROR ER-DR LOOP ERROR
2 ER-CI:ERROR ER-CI LOOP ERROR
3 RS-CD:ERROR RS-CD LOOP ERROR
4 RS-CS:ERROR RS-CS LOOP ERROR
5 CI INT:ERROR CI interruption is not made.
6 CD INT:ERROR CD interruption is not made.
7 CS INT:ERROR CS interruption is not made.
8 TXEMP:ERROR TXEMP is not set.
9 TXEMP INT:ERROR TXEMP interruption is not made.
10 TXRDY:ERROR TXRDY interruption is not made.
11 TXRDY INT:ERROR TXRDY interruption is not made.
12 RCVRDY:ERROR RCVRDY is not set.
(Reception enabled. TR-Q is
generated during check)
13 RCVRDY INT:ERROR RCVRDY interruption is not made.
14 SD-RD:ERROR SD-RD LOOP ERROR
(DATA ERROR)
15 SD-RD:ERROR SD-RD LOOP ERROR (DATA
ERROR
16 TIMER:ERROR TIMER ERROR (TMRQ is not set
after completion of check.)
17 TIMER INT:ERROR TRQ-1 interruption is not made.
Terminating procedure
Press the CANCEL key to terminate the check.
3) CH2 Check
Check content
The check procedure, the display, and the terminating procedure
are the same as CH1 Check.
4) CH3 Check
Check content
The check procedure, the display, and the terminating procedure
are the same as CH1 Check.
5) CH4 Check
Check content
The check procedure, the display, and the terminating procedure
are the same as CH1 Check.
6) CH5 Check
Check content
The check procedure, the display, and the terminating procedure
are the same as CH1 Check.
RS232 I/F Diagnostics
CHANNEL Check
CH1 = exist!
←
Display when channel present
CH2 = exist!
CH3 = none!
←
Display when no channel
CH4 = none!
CH5 = none!
CH6 = none!
CH7 = none!
RS232 CH1 Check
ER-DR : ERROR!!
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