38
Fig. 1
PC adapter (converts sensor data output to RS232 for PC)
The 9 Way D-type plugs into the PC COM port and the pre-wired sensor connector is
inserted into J3 on the Combi Flam PCB (198 Issue P) and J3 on the Combi Tox PCB (204
Issue N). When Hyper-terminal on the PC set at 4800 baud (no handshake) and connected
to the com port, the PC should now display the continuous sensor output .
When programming the sensor processor, the Run and Prog slide switch SW2 is set to
Prog but under normal circumstances, this switch should be in the Run position.
The Reset push button SW1 when pressed gives a hardware reset to the sensor processor.
This can be pressed at any time and the sensor reacts in the same way as if it had reset
itself.
Sensor connector
Reset
0V
Unused
RX
TX
5V
9 way D type
0v Pin 5
PC transmits on
pin 3 so this is RX
to the sensor
PC receives on
pin 2 so this is TX
from the sensor
Appendix 5
Fuse ratings
F1 – Mains input
1A – Anti-Surge
