OPTO 22 PAMUX, User Manual

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GLOSSARY
E-2 Pamux User’s Guide
B6
An addressable analog brain board that can control up to 16 input or output points in distributed
I/O applications. Any combination of Pamux B6 brain boards may be linked on a single Pamux
bus to control up to 512 points of analog and digital I/O. The B6 includes an on-board
microprocessor that continually scans all I/O points on the mounting rack, performs necessary
conversions, and then updates a dual-port RAM. The host computer transfers data along the
Pamux bus by reading from or writing to the dual-port RAM.
bank
A group of eight digital I/O channels. A 16-channel digital I/O mounting rack with a B5 brain
board has two banks. If the brain board is at address 20 and the AC28 card is at base I/O
address 100, then the two banks are at I/O addresses 120 and 121. Banks and points are used
together to access I/O points on a board at a particular address.
base address
The starting I/O address for programmable registers, used as the reference address for all other
I/O addresses.
baud rate
The rate of transmission of serial communication data, expressed in bits per second (bps). For
example, a device with a baud rate of 9,600 can transmit and/or receive data at 9,600 bits per
second.
bit
A single binary digit (0 or 1).
brain board
An interface card that connects an analog or digital I/O mounting rack to a communication bus,
such as the Pamux bus.
bus
A single common cable used to connect all devices on a system. The Pamux bus is a 50-pin flat-
ribbon cable.
byte
A group of eight bits; an eight-bit binary number. For example, 10011011.
channel
See
point.
digital
Describes data that can assume only two values: on or off, 1 or 0, true or false. Opposite of
analog. Also called discrete.
digital point
An input or output that is either on or off, 1 or 0, true or false. Also called discrete point.