– 11 –
Pin
Name
Function
1
CHASSIS
Printer chassis ground
2
TXD
Data from printer
3
RXD
Data to printer
4
RTS
Always space
5
CTS
Space when computer is ready to send data. Printer ignores this signal.
6
Not used.
7
GND
Signal ground
8-10
Not used.
11
RCH
Printer sets line to space when ready to receive data. Same signal as pin 20.
12
Not used.
13
Not used. (single ground)
14-19
Not used.
20
DTR
Printer sets line to space when ready to receive data.
21-25
Not used.
5.
Serial Interface
When using the serial interface, the optional Serial-Parallel Converter must be connected to the printer.
5-1. General Specifications
Item
Specifications
Interface
RS-232C level
Synchronization System
Asynchronous
Baud rate
300 - 19,200 bits per second (BPS) [selectable]
300, 300, 600, 1200, 2400, 4800, 9600, 19200 BPS
Word length
Start bit:
1 bit
Data bit:
7 or 8 bits (selectable)
Parity bit:
Odd, Even or None (selectable)
Stop bit:
More than 1 bit length
Signal polarity
Mark:
Logic
″
1
″
(–3V to –15V)
Space:
Logic
″
0
″
(+3V to +15V)
Handshaking
DTR
X
ON
/X
OFF
5-2. Connector Signal and Functional Descriptions
Содержание LC-8521
Страница 1: ...DOT MATRIX PRINTER LC 8521 TECHNICAL MANUAL THIRD EDITION ...
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Страница 101: ... 97 Blank Page ...
Страница 102: ... 98 4 Wiring Scheme of Printer ...
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Страница 104: ... 100 5 Electrical Parts 5 1 Main Logic Board 5 1 1 Circuit Diagram ...
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Страница 108: ... 104 5 1 2 Component Layout ...
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Страница 116: ... 112 5 4 Power Supply Unit 5 4 1 Circuit Diagram ...
Страница 117: ... 113 5 4 2 Component Layout ...
Страница 120: ... 116 6 Serial Parallel Converter Board Option 6 1 Wiring Scheme ...
Страница 122: ... 118 6 3 CPU Board 6 3 1 Circuit diagram ...