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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.
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