Programmer's Guide
PcOS Series 90PLUS
Product Self Tests
11/07/05
Rev Q
Page 125
Recommendation
Parallel link
options
Parallel option features define how strobe, busy, and
acknowledge (ACK) signals operate. In normal mode, the
printer follows the standard (Centronics) parallel port
conventions. With Options 1 and 3, acknowledge and busy
signals change simultaneously. This is sometimes referred
to as “ack-after-busy.” Options 2 and 3 force busy high on
the rising edge of the strobe. This is sometimes referred to
“busy-while-strobe timing.” In all cases, the data is latched
on the rising edge of the strobe. In most cases, the normal
timing mode will give the best and most universal results.
Normal ack-while-busy
•
Option 1 ack-after-busy
Option 2 ack-while-busy
Option 3 ack-after-busy
Parity
The serial mode parity can be set to none, odd, or even.
None
•
Odd
Even
Bit data
The serial bit format can be set to 8 or 7.
8-bit format
•
7-bit format
Protocol
The flow control protocol and the serial link can be set to
Ready/Busy or XON/XOFF. If XON/XOFF is selected
Ready/Busy also functions.
Ready/Busy
•
XON/XOFF
Baud rate
The bit rate of the printer can be set to: 19200, 9600, 4800,
2400, 1200, 600, or 300 bits per second. The same bit rate
is for send and receive.
19200 bits per second
9600 bits per second
•
4800 bits per second
2400 bits per second
1200 bits per second
600 bits per second
300 bits per second
DTR/RTS
signal
The serial port DTR and/or RTS signal can be configured to
provide flow control. If DTR is configured as the flow control
signal, it will toggle to false when the buffer is full, RTS will
not. When the cover is open, both signals will always toggle
to false.
Not used
DTR flow
RTS flow
RTS and DTR flow
•
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