PK-232 TECHNICAL MANUAL
CHAPTER 2 – FUNCTIONAL DESCRIPTION
PK232TM Rev. A 5/87
2-1
Page 10
CHAPTER 2 – FUNCTIONAL DESCRIPTION
2.1
Major Sections
The PK-232 Data Controller has five major functional blocks:
o
Analog
o
Display
o
Digital
o
Power Distribution
o
Input/Output (I/O)
Each of these functional blocks has its own distinct functions. The following paragraphs de-
scribe each section.
Refer to the PK-232 Functional Block Diagram, Figure 1 in Appendix C, while reading these
descriptions.
2.1.1
Analog Section
The analog section consists of active filters, limiters, a threshold detector, DCD (Data Car-
rier Detect and diode discriminator circuits. Analog switches automatically adjust various
circuit characteristics for each operating mode.
2.1.2
Digital Section
The digital section contains a microprocessor, read only memory (ROM) random access
memory (RAM), two crystal-controlled clock generators an a variety of "glue" chips to
gate and isolate the digital signals.
2.1.3
Input/Output Section
The I/O Section provides a standard serial data path in accordance with EIA RS-232-C
and CCITT Recommendations V.24/V.28, between the PK-232 and the associated com-
puter
or
terminal.
The I/O section contains an HDLC (High-Level Data Link Control) translator; output driv-
ers for AFSK tones, DC logic voltages for direct FSK transmitter keying, CW DC keying sig-
nals, a watchdog timer and PTT (push-to-talk) switching voltages for the associated trans-
mitter.
The I/O section also isolates input and output control signal buffers and provides circuits
for connecting an external modem.
All control and communications to and from the PK-232 pass through the I/O section.
2.1.4
Display Section
The display section consists of a tuning indicator and its associated driver; status and
mode indicators with their drivers and receivers; a DCD indicator and a threshold control.
2.1.5
Power Distribution Section
The Power distribution section contains voltage regulators, DC-to-DC converters for the
PK-232's operating system and a battery system for backing up maintaining the data
stored in RAM.
Summary of Contents for PAKRATT PK-232
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