Technical data
9030/40 Peripherals 7-7
HP
27128A Asynchronous Serial Interface (ASI)
Features
• Switch selectable
and
software programmable baud rate; up to 19,200 bits per second.
•
EIA
RS-232C, CCITT V.24, and CCITT V.28 compatibility.
• 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/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;
UP - Single Text T ermination. (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.
(See table)
ASI
Baud
Rate Switches
Switches
S5 S6
S7
S8
BAUD Rate
Down Down
Down
Down
50
Down Down Down
Up
75
Down
Down
Up
Down
110
Down Down
Up
Up
134.5
Down
Up
Down
Down
150
Down
Up
Down
Up
300
Down
Up
Up
Down
600
Down
Up
Up
Up
900
Up
Down Down Down
*1200
Up
Down
Down
Up
1800
Up
Down
Up
Down 2400
Up
Down
Up Up
3600
Up
Up
Down Down 4800
Up
Up
Down
Up
7200
Up
Up
Up
Down
**9600
Up
Up
Up Up
19200
* Typical
modem
**rypical direct connection application