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THEORY OF OPERATION Model 360E Instruction Manual
10.4. Interface
The analyzer has several ways to communicate the outside world, see Figure 10-16. 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 RS232 & RS485 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
A4ST
COMM
A
Male
ETHERNET
OPTION
Figure 10-16: Interface Block Diagram
10.4.1. Front Panel Interface
MODE FIELD
KEY DEFINITIONS
MESSAGE FIELD CONCENTRATION FIELD STATUS LED’s
KEYBOARD ON / OFF SWITCH
FASTENERFASTENER
POWER
FAULT
CAL
SAMPLE
GAS FILTER CORRELATION CO
2
ANALYZER- MODEL 360E
SAMPLE A RANGE = 500.0 PPM
CO2 = 400.0
<TST
TST> CAL
SETUP
LOCKING SCREW
Figure 10-17: M360E Front Panel Layout
184 05232 Rev B3