User`s manual

4. 5 Stand Alone VFD Pole Display

4.5.1. Specifications

Data transmission: Serial

Synchronization: Asynchronous

Handshaking: DTR / DSR

Signal level:

MARK = -3 to –15 V (logic “1”)

SPACE = +3 to +15 V (logic “0”)

Baud rates: 4800,9600,19200,38400 bps

Parity: None, even

Bit length: 8 bits

Stop bits: 1 or more

4.5.2. The communication flow

Data flow:

PC/host to display, Display to printer, Printer to

PC/host

Handshaking flow:

Display to PC/host, printer to display,

PC/host to printer

Note: There are 200 bytes resident buffer in the display for pass data to

printer. If PC/host keep transmitting the data to printer when the display

inactive DTR or RTS, data will be lost.

Customer

display

Host

computer

Receipt

printer

: Control connecting direction

: Data connecting direction