Star Micronics LC-8521, Technical Manual

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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