Bailey Infi 90 IMSPM01, Instruction, Page: 15 / 52

INTRODUCTION
I-E96-217A 1 - 7
GLOSSARY OF TERMS AND ABBREVIATIONS (continued)
REFERENCE DOCUMENTS
NOMENCLATURE
The following modules and equipment can be used with a SPM:
Term Definition
Slave Expander
Bus Parallel address/data bus between the master module and the slave that
point data and slave status data are exchanged over.
SRAM Static Random Access Memory; a memory that does not need to be
refreshed many times a second, as is required with dynamic RAM; this is
volatile memory. Once a device puts a value into a static memory location,
the value remains there until power is removed.
TU Termination Unit; provides input/output connection between plant equipment
and the INFI 90 process modules. The termination unit is a flat circuit board
for panel mounting.
UART Universal Asynchronous Receiver/Transmitter; a device that converts paral-
lel data into serial form for transmission along a serial interface, and vice
versa.
UVROM Ultraviolet Read Only Memory; a special programmable ROM that can be
erased using a high-tensity, ultraviolet light, then reprogrammed. This is
non-volatile memory; it does not lose its program when power is removed.
Document
Number
Document
E93-905-9 Enhanced Computer Interface Unit
Programmer's Reference Manual
Nomenclature Hardware
NTCU01 Termination Unit
NKTU01 Cable, Termination Unit