Synchronization:
Asynchronous
Handshaking:
DTR protocol, XON/XOFF protocol,
ETX/ACK protocol (selectable)
Parity check:
Odd, even, or none (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
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
R
Blackberry REV.D
A5 size Appendix
95/05/08
Appendix
A-9
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