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ER-A850 (serv.man3). ERA8RS RS232 Interface Service Manual - Sharp EPOS Service Manual (repair manual). Page 11

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4. Jumper pin setting
1) J1, J2
Jumper 
No.
Description
RI
+5V
J1
Used to set
RS CN1 9pin
signal.
RI signal
(input) initial
setting
+5V (output)
J2
Used to set
RS CN1 9pin
signal.
RI signal
(input) initial
setting
+5V (output)
2) J3, J4
Jumper No.
Description
J4
J3
1
1
Sets PR CN1 to LPT1. (378h 
∼
 17Fh)
Initial
setting
1
0
Sets PR CN1 to LPT3. (378h 
∼
 37Fh)
0
1
Sets PR CN1 to LPT32 (378h 
∼
 37Fh)
0
0
PR CN1 disabled
3) J5, J6, J7
Jumper No.
Description
J7
J6
J5
RS CN1
RS CN2
1
1
1
COM1
(3F8h 
∼
 3FFh)
[COM3]
(3E8h 
∼
 3EFh)
COM2
(2F8h 
∼
 2FFh)
[COM4]
(2E8h 
∼
 2EFh)
Initial
setting
1
1
0
DISABLED
COM2 [COM4]
1
0
1
COM1 [COM3]
DISABLED
1
0
0
DISABLED
DISABLED
0
1
1
COM2 [COM4]
COM1 [COM3]
0
1
0
DISABLED
COM1 [COM3]
0
0
1
COM2 [COM4]
DISABLED
0
0
0
DISABLED
DISABLED
*
When J9 is set to LOW, settings are shown in [    ].
4) J8
Jumper No.
Description
J8
Reserved: Fixed to 0.
5) J9
Jumper 
No.
Description
H
L
J9
Sets RS CN.
COM1,
COM2 are
used.
COM3,
COM4 are
used.
Initial setting
6) J10
Jumper 
No.
Description
5
7
J10
Sets the parallel port
interruption level.
IRQ5 is
used.
IRQ7 is
used.
7) J11 
∼
 J17
Jumper 
No.
Description
1
2
J17
Sets the
RS232 port
interruption
level.
COM1
[COM3] uses
IRQ3.
COM2
[COM4] uses
IRQ3.
J16
COM1
[COM3] uses
IRQ4.
COM2
[COM4] uses
IRQ4.
J15
COM1
[COM3] uses
IRQ9.
COM2
[COM4] uses
IRQ9.
Initial
setting
of 1
J14
COM1
[COM3] uses
IRQ10.
COM2
[COM4] uses
IRQ10.
Initial
setting
of 2
J13
COM1
[COM3] uses
IRQ11.
COM2
[COM4] uses
IRQ11.
J12
COM1
[COM3] uses
IRQ12.
COM2
[COM4] uses
IRQ12.
J11
COM1
[COM3] uses
IRQ15.
COM2
[COM4] uses
IRQ15.
8) J15
Jumper 
No.
Description
O
I
J18
Parallel port
data setting
Set to output.
Initial setting
Set to input.
J1
RI +5V
J2
RI
 +
5
V
J3
J4
J5
J6
J7
J8
01
J9
L
H
J10
5 7
J1
8
0
I
J1
1
J1
2
J1
3
J1
4
J1
5
J1
6
J1
7
21
Jumper pin layout
RI +5V
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