Service manual

ER-A410U/ER-A420U HARDWARE DESCRIPTION
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6-3. OTHERS
The MODE key switch and other sensor signals are read with the CPU
port P90 and 91 at the keyboard strobe timing. Reading is performed
10~100us before turning off the strobe signal.
6-4. DISPLAY
The ER-A410/A420 is provided with the front LCD of 5 x 7dot, 2 lines 16
digits, and the 7-digit LED on the pop up side.
FRONT:
POP UP:
• DISPLAY DIGIT SIGNAL
The above ST0~ST6 are DIGIT signals.
ST0: 1st digit~ST6:7th digit
• DISPLAY SEGMENT SIGNAL (REFER TO 6-2.)
By writing segment data to 4000h, the LED segment signal can be
outputted.
DATA~SEGMENT correspondence
7. SERIAL I/O
The ER-A410/ER-A420 is provided with 2 channels of RS-232 PORTs as
standard provision.
The RS-232 ch1 and ch2 are assigned to the following CPU port and I/O.
Ch1
Ch2
<Serial I/O ch2 receive signal> Read
RS-232 I/F BLOCK DIAGRAM
CPU STO ST1 ST2 ST3 ST4 ST5 ST6 ST7 ST8 ST9
MODE P90 SRV PGM VOID OP X/Z REG MGR X1/Z1 X2/Z2 Key Select
OTHERS P91 PF-R PF-J RPE HEAD UP JPE DRAWER
OPEN
RS1_CI
P90 ST0 : MODE Key SRV “0” SRV mode
ST1 : MODE Key PGM “0” PGM mode
ST2 : MODE Key VOID “0” VOID mode
ST3 : MODE Key OP X/Z “0” OP X/Z mode
ST4 : MODE Key REG “0” REG mode
ST5 : MODE Key MGR “0” MGR mode
ST6 : MODE Key X1/Z1 “0” X1/Z1 mode
ST7 : MODE Key X2/Z2 “0” X2/Z2 mode
ST9 : Keyboard select “0” Flat key
“1” Normal key
P91 ST0 : Receipt feed “0” Receipt feed
ST1 : Journal feed “0” Journal feed
ST2 : Receipt paper end “1” Receipt paper end
ST3 : Head up “0” Head up
ST4 : Journal paper end “1” Journal paper end
ST6 : Drawer open sensor “0” Drawer open
ST9 : RS-232 ch1 CI signal
D0~D6 3 a~g
D7 3 DP
Pin No. CPU PORT Signal to be used
34 /RTS1 /RS1
32 RXD1 RD1
31 TXD1 SD1
26 P74 /ER1
25 P75 /CD1
24 P76 /CS1
23 P77 /DR1
6 P91 (Refer to 6-3.) /CI1
Pin No. CPU PORT Signal to be used
38 /RTS0 /RS2
36 RXD0 RD2
35 TXD0 SD2
18 P84 /ER2
Address Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bir1 Bit0
04000h X X X X /CD2 /DR2 /CS2 /CI2
CPU
Ch1 connector
Ch2 connector
MUX
B
A
A/B
Y
+5V