Star Micronics SP300 Series - Manual (Page 11)

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2-1. Interface Specifications
1 Data transmission method: Asynchronous serial interface
2 Baud rate: Selectable from 150, 300, 600, 1200,
2400, 4800, 9600, 19200 (Twin Head
only) bps (Refer to Installation
Manual.)
3 Word length Start bit: 1 bit
Data bit: 7 or 8 bits (selectable. Refer
to Installation Manual.)
Parity bit: Odd, even or none
(selectable. Refer to Installation
Manual.)
Stop bit: 1 or 2 bit length
4 Signal polarity RS-232C (Standard feature)
MARK : Logic “1”(–3V to –25V)
SPACE : Logic “0” (+3V to +25V)
Current loop (optional)
MARK : Logic “1”(current ON)
SPACE : Logic “0” (current OFF)
RS-422A (Optional)
MARK : Logic “1”
A is –0.2V or less than B
SPACE : Logic “0”
A is 0.2V or more than B
2. SERIAL INTERFACE
b0 b1 b2 b3 b4 b5 b6 (b7)
A B C D
Mark [1]
Space [0]
A: Start bit
B: Data bits
C: Vertical parity bit
D: Stop bit