|The OCTOBUS four and eight port multi-user serial
expansion cards offer a flexible and cost effective solution to providing multiple user
access to a host computer system. The OCTOBUS range provides solutions with excellent
value without compromising quality or service.
The OCTOBUS serial cards offer multiple 16550 RS-232D asynchronous communications with a minimum of
four serial ports to a maximum of eight per card.
In operation the COM ports will behave as any normal COM port.
Each card has individually selectable Baud rate of up to 56K baud, and connection to the outside world via
standard RJ12 connectors.
Ports one to seven support software handshake XON-XOFF and hardware handshake lines RTS and
CTS/DSR. Port eight only supports XON-XOFF.
A choice of five interupt settings are available; IRQ2, IRQ3, IRQ4, IRQ5 and IRQ7.
Each model has up to four address sets which may be chosen. Each set consists of eight port addresses and one status register address.
The status register can be set to BCD or BIT format, so the card is flexible for a variety of O/Ss.
Up to 4 cards may be installed into a PC (subject to the availability of interupts and addresses)
|4 or 8 ports
|NS 16450 Compatible Standard
|From 50 to 38,400 BAUD
|4 or 8 RJ11 (6 way)
|Levels are to EIA RS232D
|Pin 1 - Ready to send
|Pin 4 - Receive (Rx)
|Pin 2 - Ground
|Pin 5 - Ground
|Pin 3 - Transmit (Tx)
|Pin 6 - CTS/DSR
View the OCTOBUS card with the chips visible and the RJ12 sockets to the right. A representation of the jumpers is shown below.