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Serial interface specifications
The serial interface has the following characteristics.
Bit rate: 300, 600, 1200, 2400, 4800, 9600, 19200 bps
(selectable)
Word length:
Data format 7 or 8-bit (selectable)
Start bit 1 bit
Parity bit 0 or 1 bit (selectable)
Stop bit 1 bit (transmitting), 1 bit or more (receiving)
Synchronization: Asynchronous
Handshaking: DTR protocol, XON/XOFF protocol
ETX/ACK protocol (selectable)
Parity check: Odd, even, or no parity bit (selectable)
Connector: EIA standard, 25-pin, D-SUB, female
connector
Serial pin assignments
The following table lists the serial connector pin assignments and
describes their respective interface signals.
Pin No. Signal Direction Description
1
Protective Ground (FG)
Printer’s chassis ground
2
Transmitted data (TXD/SD)
Out
Printer has transmitted serial data
3
Received data (RXD/RD)
In
Printer has received serial data
4
Request to Send (RTS/RS)
Out
Always positive
5
Clear to Send (CTS/CS)
In
Ignored
7
Signal Ground (SG)
Return path for data control
signals
11
Reverse Channel
Out
Connected to Pin 20
20
Data Terminal Ready
(DTR/ER)
Out
Positive when the printer is ready
to accept data, and negative
when the printer is not ready
L
Blueberry REV.D
A5 size Appendix
95/01/20
A-8 Appendix