Technical data
Asynchronous Serial Interface (ASI) -
HP
27128A
Features
9050 Peripherals 7-7
• Switch selectable and software programmable baud rate;
up
to 19
200
bits per second.
•
EIA
RS-232C,
CCnT
V.28 compatible.
• Asynchronous transmission
in
simplex,
full
duplex, and echoplex mode.
• Programmable format control and built-in framing error, overrun error, and parity checking.
• Break detection, support for X-ON or X-OFF and terminal emulation mode.
Configuration
The normal switch settings are:
S1: Single Text Termination;
S2: Hard wired;
S3: No
Parity;
S4:
Bits
Per Character;
S5
to S8: Baud Rate; (See table)
S5
Down
Down
Down
Down
Down
Down
Down
Down
Up
Up
Up
Up
Up
Up
Up
Up
* Typical
modem
**
Typical
direct
connection
application
Connections
Up - Single Text Termination. (Typical)
Down - Not Single Text Termination.
Up - Device directly connected.
Down - Device Not Directly Connected.
(Modem use)
Up
- No Parity. (Typical)
Down -
Odd
Parity.
Up
- 8
Bits
Per Character. (Typical)
Down -
7
Bits
Per Character.
ASI
Baud
Rate
Switches
Switches
S6 S7 S8
BAUD Rate
Down Down Down
50
Down Down
Up
75
Down
Up
Down
110
Down
Up
Up
134.5
Up
Down
Down
150
Up
Down
Up
300
Up Up
Down
600
Up
Up
Up
900
Down
Down
Down
*1200
Down Down
Up
1800
Down
Up
Down
2400
Down
Up
Up
3600
Up
Down
Down
4800
Up
Down
Up
7200
Up
Up
Down
**9600
Up Up Up
19200
Cabling information
is
in
the configuration section.