Teledyne 200AH 用户手册

 

The computer CPU board communicates via 2 major hardware assemblies. These are the V/F 
board and the front panel display/keyboard. The V/F board communicates with the CPU via the 
STD-100 bus. 

The V/F board includes of A/D input channels, digital I/O channels, and analog output channels. 
The computer receives all of the instrument data and provides all control functions through the 
V/F board. 

The front panel of the M200AH is shown in Figure 2-5. The front panel consists of a 2 line 
display and keyboard, 3 status LED's and power switch. Communication with the display, 
keyboard, and status LED's is done via the computers on-board parallel port. The M200AH was 
designed as a computer controlled instrument, therefore all major operations can be controlled 
from the front panel display and keyboard. 

The display consists of 2 lines of 40 characters each. The top line is divided into 3 fields, and 
displays information. The first field is the mode field. 

The center field displays TEST values. The TEST functions allows you to quickly access many 
important internal operating parameters of the M200AH. This provides a quick check on the 
internal health of the instrument. The right hand field shows current concentrations values of 
NO, NO

X

, and NO

2

. 

The M200AH can operate in any of 3 different sampling modes - NO only, NO

X

 only, and 

NO/NO

X

 switching mode. For the NO or NO

X

 only modes just the single gas being measured is 

displayed. For the NO/NO

X

 switching mode, the display scrolls between the NO, NO

X

, and NO

2

 

concentration values every 4 seconds.  

The second line of the display contains eight fields, each field defines the key immediately 
below it. By redefining the keys dynamically it is possible to simplify the instrument electronics 
and user interface. 

At the right of the display there are 3 status LED's. They can be in three states, OFF, ON, and 
Blinking. The meanings of the LED's are given in Table 4-2.