Read Sharp ER-A750 (serv.man2) Service Manual online
SERVICE MANUAL
CODE: 00ZERA7RSSM/E
ECR/POS TERMINAL OPTION
RS-232 INTERFACE
MODEL
ER-A7RS
ER-A7RS SWITCH SETTING
5. MCR SWITCH : MCR setting
CON 1
MCR SW
S1
1. S1 : RS232 channel setting
4. IPL SWITCH : IPL mode setting
IPL SW
CON 2
IC 12
CON 4
3. JP3. JP4 : CI signal setting
JP 3
JP 4
JP 1
JP 2
2. JP1. JP2 : /CTS signal setting
CON 3
SHARP CORPORATION
Parts marked with "!
" is important for maintaining the safety of the set. Be sure to replace these parts with specified
ones for maintaining the safety and performance of the set.
1. S1 : RS232 channel setting setting
S1
CON3
Setting
S1
CON4
Setting
1
2
3
4
5
6
0
0
0
RS232 invalid
0
0
0
RS232 invalid
1
0
0
Channel 1
1
0
0
Channel 1
0
1
0
Channel 2
0
1
0
Channel 2
1
1
0
Channel 3
1
1
0
Channel 3
0
0
1
Channel 4
0
0
1
Channel 4
1
0
1
Channel 5
1
0
1
Channel 5
0
1
1
Channel 6
0
1
1
Channel 6
1
1
1
Channel 7
1
1
1
Channel 7
2. JP1, JP2 : /CTS signal setting
3. JP3, JP4 : CI signal setting
4. IPL SWITCH : IPL mode setting
5. MCR SWITCH : MCR setting
6. Description of main LSI
6-1. OPC1 (F25600) IC6
1) General description
The OPC1 is a gate array of integrated peripheral circuits of
RS-232/Simple IRC interface.
RS-232/Simple IRC interface.
One chip of the OPC1 is equipped with four communication circuits.
(Three of them are for RS-232 only: UNIT 0 ~ 2, one is for selection
of simple IRC/RS-232: UNIT 3)
(Three of them are for RS-232 only: UNIT 0 ~ 2, one is for selection
of simple IRC/RS-232: UNIT 3)
The ER-A7RS uses UNIT0 (RS-232 interface) and UNIT7 (RS-232
interface).
interface).
UNIT NO.
Purpose
ER-A7RS
UNIT0
RS-232
Used.
UNIT1
RS-232
Used.
UNIT2
RS-232
Not used.
UNIT3
RS-232/Simple IRC
Not used.
Each UNIT of the OPC1 has the following functions:
1
Timer function
Used for the timer between characters in data reception.
Used for the timer between characters in data reception.
2
Address decode
USART chip select output and own select.
USART chip select output and own select.
3
Interruption control
RSRQ, TRRQ output using outputs from USART (TRNRDY,
TRNEMP, RCVRDY, BRK) and RS-232 control signals (CI, CTS,
CD) as interruption factors.
TRNEMP, RCVRDY, BRK) and RS-232 control signals (CI, CTS,
CD) as interruption factors.
(For the simple IRC, TRNEMP is excluded.)
* RSRQ:
TRRQ(Not used):
For RS-232
For simple IRC
For simple IRC
4
Simple IRC send/receive control (UNIT3 only) : Not used
2) Pin configuration
S1
O
F
F
1
2
3
4
5
6
COM3
COM4
1
0
COM3 Channl No.: 3
(Initial setting)
(Initial setting)
COM4 Channl No.: 4
(Initial setting)
(Initial setting)
JP1/JP2
1
3
/CTS signal : GND
Initial setting
JP1/JP2
1
3
/CTS signal : Enable
JP3/JP4
1
3
CI signal input
Initial setting
JP3/JP4
1
3
VCC (+5V) input
IPL mode : OFF
Initial setting
OFF
ON
ILP SW
IPL mode : ON
OFF
ON
ILP SW
MCR : Valid
Initial setting
MCR SW
INVALID VALID
MCR : Invalid
MCR SW
INVALID VALID
CS3
CS2
TRNEMP3
BRK3
TRANDY3
RCVRDY3
RXDATA0
TRCK
RES
OPTCS
D0
D1
D2
D3
GND
D4
D5
D6
D7
RSRQ
A0
A1
A2
A3
A4
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
SL12
RCVRDY2
RCVDT1
RCVRDY1
TRNRDY1
BRK1
DB7
DB6
DB5
DB4
GND
DB3
DB2
DB1
DB0
TRNEMP1
TRNRDY0
RCVDT0
RCVRDY0
TRNEMP0
BRK0
SL30
XOUT
SL22
RES
75
74
73
72
71
70
69
68
67
66
65
64
63
62
61
60
59
58
57
56
55
54
53
52
51
OPC1
F256004
– 1 –
3) Block diagram
D7
D6
D5
D4
D3
D2
D1
D0
Data bus buffer
WRO
RDO
RES
W
R
RES
Read/write
control
control
A5
A4
A3
A2
A1
A0
SL00
CS0
Decorder
control
control
SL01
SL02
SL10
SL11
SL12
SL20
SL21
SL22
SL30
SL31
SL32
TRV
USICH
CS3
CS2
CS1
CHSL
TO/FROM USART
Inline
cont
cont
OCS
TCR0
Timer0 control
Timer0
RCVDT0
TCR1
Timer1 control
Timer1
RCVDT1
TCR2
Timer2 control
Timer2
RCVDT2
TCR3
Timer3 control
Timer3
RCVDT3
RTS CNT
RTS1
RTS0
RS
RQ
TR
R
Q
TR
Q
1
TR
Q
2
Power
supply
cont.
supply
cont.
RCVRDY3
RCVRDY2
RCVRDY1
RCVRDY0
TRNEMP3
TRNEMP2
TRNEMP1
TRNEMP0
Interrupt control
CT
S
0
CT
S
1
CT
S
2
CT
S
3
/P
1
BR
K0
BR
K1
BR
K3
T
RNR
DY
0
AB1
AB0
– 2 –
4) Pin description
OPC1 pin table
The signals marked with "-" at the end are LOW active signals. Example: "CS1-" = "CS1"
No.
Pin No.
Pin name
I/O
Pin
ER-A7RS
Description
1
80
SL00
I
ICU
SL00
RS-232/UNIT0 channel select
2
79
SL01
I
ICU
SL01
3
78
SL02
I
ICU
SL02
4
77
SL10
I
ICU
SL10
RS-232/UNIT1 channel select
5
76
SL11
I
ICU
SL11
6
75
SL12
I
ICU
SL12
7
95
SL20
I
ICU
GND
RS-232/UNIT2 channel select
8
96
SL21
I
ICU
GND
9
52
SL22
I
ICU
GND
10
54
SL30
I
ICU
GND
RS-232/UNIT3 channel select
11
93
SL31
I
ICU
GND
12
94
SL32
I
ICU
GND
13
36
CS0-
O
O
CS1-
RS-232 USART chip select
14
32
CS1-
O
O
CS2-
15
2
CS2-
O
O
NC
16
1
CS3-
O
O
NC
RS-232/INLINE USART chip select
17
81
CD0-
I
IS
DCD1-
RS-232 control signal CD- input
18
46
CD1-
I
IS
DCD2-
19
88
CD2-
I
IS
VCC
20
38
CD3-/P0-
I
IS
NC
RS-232 CD-/INLINE P0-
21
82
CTS0-
I
IS
CTS1-
RS-232 control signal CTS- input
22
47
CTS1-
I
IS
CTS2-
23
86
CTS2-
I
IS
VCC
24
43
CTS3-/P1-
I
IS
GND
RS-232 CTS-/INLINE P1-
25
48
CI0-
I
IS
CI1-
RS-232 control signal CI- input
26
45
CI1-
I
IS
CI2-
27
87
CI2-
I
IS
VCC
28
99
CI3-/P2I
I
IS
GND
RS-232 CI-/INLINE P2I
29
55
BRK0
I
ISC
BRK1
RS-232 USART BREAK signal
30
70
BRK1
I
ISC
BRK2
31
27
POFF-
I
IS
POFF-
POFF signal (LOW: P-OFF, HIGH: P-ON)
32
4
BRK3
I
IS
GND
RS-232/INLINE USART BREAK signal
33
57
RCVRDY0
I
ISC
RCVRDY1
RS-232 USART RCVRDY signal
34
72
RCVRDY1
I
ISC
RCVRDY2
35
74
RCVRDY2
I
ISC
GND
36
6
RCVRDY3
I
IS
GND
RS-232/INLINE USART RCVRDY signal
37
59
TRNRDY0
I
ISC
TRNRDY1
RS-232 USART TRNRDY signal
38
71
TRNRDY1
I
ISC
TRNRDY2
39
98
TRNRDY2
I
ISC
GND
40
5
TRNRDY3
I
IS
GND
RS-232/INLINE USART TRNRDY signal
41
56
TRNEMP0
I
ISC
TRNEMP1
RS-232 USART TRNEMP signal
42
60
TRNEMP1
I
ISC
TRNEMP2
43
100
TRNEMP2
I
ISC
GND
44
3
TRNEMP3
I
IS
GND
RS-232/INLINE USART TRNEMP signal
45
58
RCVDT0
I
ISC
RCVDT1
RS-232 RCVDT signal (LOW: TIMER START)
46
73
RCVDT1
I
ISC
RCVDT2
47
97
RCVDT2
I
ISC
VCC
48
41
RCVDT3
I
IS
GND
RS-232/INLINE RCVDT signal
49
20
RSRQ-
O
3S
IRQ1
RS-232 IRQ- signal
50
83
TRV-
I
ISC
VCC
INLINE YES/NO
51
7
RXDATA0
O
O
NC
INLINE RXDATA OUT
52
42
TXE
O
O
NC
INLINE TRNS ENABLE
53
84
TRRQ-
O
3S
NC
INLINE IRQ- signal
54
28
TRQ1-
O
3S
TRQ1
TIMER IRQ signal (RS-232)
– 3 –
