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PROTOCOL CONVERTER MODEL A/S-4
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1. General Information
THE A/S-4 is an SNA protocol converter. It is capable of a wide variety of conversions and adaptation
tasks. Listed below are just a few of the tasks the A/S-4 was designed to perform:
• Bit-oriented protocol, SDLC
• Byte-oriented protocol, ASCII
• Serial Data Transfer and Conversion
• Screen Emulation of various CRTs
• Storage of prompting commands
• Protocol conversions
• Character conversions
• Communication conversions
The A/S-4 is also designed to be easily installed and operated. The A/S-4 hardware consists of the
following components:
• 16K of available Static Random Access Memory (RAM) and 32K Non-volatile Erasable
Programmable Read Only Memory (EPROM).
• Two (2) Input-Output (I/O) Serial interface ports capable of the following operations:
- async, byte sync, or bit sync
- half or full duplex
- up to 19.2 bit per second data transfer
- automatic CRC generation and checking (CRC-16 or CCITT-16)
- 8 bit address recognition
- automatic zero bit insertion and deletion
- Data Terminal Equipment (DTE) or Data Communication
- Equipment (DCE) operations
- NRZI, TDI or RS232C
• Power, Data Send/Receive, and signal visual LED Indicators
• 6809 Microprocessor control
• 6 switch banks for changing RS232, NRZI, and TDI pin assignments of the serial ports
• 2 switch banks for option selections.