236 Agilent 1200 Series Autosampler Reference Manual
8 Theory of Operation
Autosampler Main Board (ASM)
Common Electronics
A common electronics and firmware design is used for all Agilent 1200 Series
LC modules. This core design provides a basic set of functions to each module.
ASIC —
Application-
Specific
Integrated Circuit
The application-specific integrated circuit (ASIC) provides interfacing to
external devices through drivers, including GPIB, CAN, APG Remote. It is
directly connected to the four control LEDs located near the connectors on
this board and the 8-bit configuration switch which is used to configure the
address for the GPIB communication, baud rate for RS-232 transfer, and so on.
Also, the ASIC controls and drives module specific functions and reads static
status signals.
Leak Converter Solvent leaking from the autosampler cools down the PTC. This changes the
resistance of the PTC causing the leak converter to generate a leak signal. The
leak converter consists of a PTC (for leak sensing) and an NTC (for
ambient-temperature compensation). This configuration ensures ambient
temperature changes do not affect the leak-sensing circuit.
Table 42 Common Electronics
Core-processor MC68332
Core-memory The core unit has 3 memory blocks:
128k *16 bit PSRAM
1M*8 Flash memory
32k*8 NVRAM
24*8 serial NVRAM from the real time clock
Communication Interfaces The core unit supports direct the following interfaces:
CAN bus
GPIB
RS232
Remote
MIO
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