Technical data

7-8 9050 Peripherals
HP 27128A Asynchronous Serial Interface (ASI) Card
Asynchronous 8-Channel Multiplexer Interface - HP 27130AlB
Features
• CCITT V.28 and EIA RS-232C compatible.
• Supports simplex, echoplex, or full duplex mode (asynchronous transmission only).
• Selection of data transmission attributes can be performed independently on each channel.
• Local intelligence reduces time consumed by the CPU during I/O transactions by offering edit
functions, special character recognition, and handshake protocol control.
• Parity, overrun, and framing errors are sensed locally to detect transmission errors.
• X-ON or X-OFF (both directions) and ENQ/ACK (one direction, host sending ENQ) hand-
shaking.
Configuration
There are
no switches to be set on the multiplexer card.
Connections
Cabling information
is in the configuration section.