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Theory of Operation Model GFC7001E Carbon Dioxide Analyzer
Teledyne Analytical Instruments 251
11.5.9. COMMUNICATION INTERFACE
The analyzer has several ways to communicate to the outside world. Users can input data and receive
information directly via the front panel keypad and display. Direct communication with the CPU is also available
by way of the analyzer’s RS-232 & RS-485 I/O ports or an optional Ethernet port. The analyzer can also send
and receive different kinds of information via its external digital I/O connectors and the three analog outputs
located on the rear panel.
Mother
Board
Status Outputs:
1 – 8
Control Inputs:
1 – 6
CPU
RS–232 ONLY
RS-232 or RS–485
KEYBOARD
RELAY
BOARD
PC/104 BUS
FRONT PANEL DISPLAY
I
2
C BUS
I
2
C BUS
Analog Outputs
A1
A2
A3
Optional
4-20 mA
COMM B
Female
A4
COMM
A
Male
ETHERNET
OPTION
Figure 11-16: Interface Block Diagram