Star Micronics LC-8521, Technical Manual

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6. Serial Interface - SPC-8K (Option)
When using the serial interface, the optional Serial-Parallel Converter must be connected to the printer.
6-1. General Specifications
Item Specifications
Interface RS-232C level
Synchronization System Asynchronous
Baud rate 150 - 19,200 bits per second (BPS) [selectable]
150, 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
ETX/ACK
Data buffer 8KB (standard)
6-2. Connector Signal and Functional Descriptions
Pin No. Signal name Direction Function
1 GND —
2 TXD OUT
3 RXD IN
4 RTS OUT
5 CTS —
6 NC
7 GND —
8~10 NC
11 RCH OUT
12~19 NC
20 DTR OUT
21~25 NC
Printer chassis ground.
This pin carries data from the printer.
This pin carries data to the printer.
Always space.
This signal is space when the computer is ready to send data.
The printer does not check this pin.
Unused.
Signal ground.
Unused.
The printer sets this signal to space when it is ready to receive data.
This line carries the same signal as pin 20.
Unused.
The printer sets this signal to space when it is ready to receive data.
Unused.