Sharp JX-8200 Service Manual page 178

SHARP SERVICE MANUAL JX8200SM [13] ELECTRICAL SECTION
Communication
Communication: Start/stop mode ...Asynchronous
Baud rate: 300, 600, 1200, 2400, 4800, 9600, 19,200,
38,400, 57,600 bps
Transmission: Full duplex
Synchronization: Start bit . . . . 1
Stop bits . . . 1
Data bits . . . 8
Internal clock synchronization
Error detection: Parity is not used
Signal levels at RS232C interface
Transmit
Signals: TXD, DTR, RTS
MC145407 (or equivalent)
Receive
Signals: RXD, DSR
MC145407 (9 or equivalent)
RS232C driven by 5V
Driver, Receiver
Receive signal level: High ...+3 to +15V
Low ... –15 to –3V
Transmit signal level: High ...+3 to +15V
Low ...–15 to –5V
Transmit data: TXD
1 2
LSB
Receive data: RXD
1 2
LSB
1. Start bit
2. 1-byte data
3. Stop bit(s)
High
Low
3
MSB
High
Low
3
MSB
13 – 19
c. AppleTalk
Connector
Female 8-pin TCS7189-01-201 or equivalent.
8
5
2
Pin Configuration
The pin numbers and signal names are given in the table below.
PIN SIGNAL NAME
3 TXD- (Transmitted Data-)
4 GND (Signal Ground)
5 RXD- (Received Data-)
6 TXD+ (Transmitted Data+)
8 RXD+ (Received Data+)
Signal Descriptions
Pin 3 (TXD-, printer output):
Data from the printer to the computer.
Pin 5 (RXD-, printer input):
Data from the computer to the printer.
Pin 6 (TXD+, printer output):
Data from the printer to the computer.
Pin 8 (RXD+, printer input):
Data from the computer to the printer.
7 6
3
4
1
SOURCE
PRINTER
...
HOST
PRINTER
HOST