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(6) RS232C I/F circuit
The RS232C I/F circuit consists of U25 and U26 (receiver/transmitter) and receives and
transmits the RS232C I/F signals.
nGRESET
To/From
U1A
CPU
nGRESET
(7) Option I/F circuit
The optional I/F circuit consists of an ordinary USB interface circuit and communication I/F
signal lines that are connected to U1A (CPU) and U14 (FPGA).
NAND gates (U27A, U27B and U27C) and transistor Q29 consist of a USB connection
detecting circuit. When USB I/F is connected to the printer, pin 23 (VBUS) of J17 is set to
"High". The detection circuit detects this level and outputs a UBINTP pulse to the CPU to
inform of the USB connection.
+3.3V
U1A
CPU
USBON
P76
172
U27C
UBINTP
8
D23
121
UDP
UDP
160
UDM
UDM
161
U25
+3.3V
Receiver/Transmitter
19
Vcc
13
TXD1
T1IN
T1OUT
12
DTR1
T2IN
T2OUT
RXD1
15
R1OUT
R1IN
10
DSR1
R2OUT
R2IN
20
SHDN
ICL3222EIVZ
U26
+3.3V
Receiver/Transmitter
19
Vcc
RTS1
13
T1IN
T1OUT
12
T2OUT
T2IN
CTS1
15
R1OUT
RS_INIT
10
R2OUT
20
SHDN
ICL3222EIVZ
USB connection detecting circuit
+3.3V
Q29
DTA114EM
R128
R125
2
3
1
U27A
5
9
6
4
10
U27B
17
TXD
8
DTR
16
RXD
DSR
9
RTS
CTS
INIT
17
8
16
R1IN
9
R2IN
[SA, Main PCB]
nSLCT-IN/CTS, nATFD-XT/DSR
nSTROBE/OCIO, nINIT/nPRIME
To/From
BUSY/RTS, nACKNLG/DTR
U14
nFAULT, SLCT/PPON0
FPGA
PE, DSWOUT, TXD0/SO0/OBDIR
IFRESET
To/From
U1A CPU
High when USB
R126
connector is connected.
C133
R127
2-39
Operation of Control Parts
J16
2
20
3
RS232C I/F
6
4
5
25
+5V
+24V
DATA0-DATA7
RXD0/SI0, SCK0
VBUS
USB_D+
USB_D-
33-38,40
[SA, Main PCB]
J17
28-32
20
4-11
1-3
I/F PCB
12-18
(Option)
24,27
25,26
23
21
22
CL-S6621
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