The RS232 debug port located at the back is used to upload new " skins " in the Chameleon, from the development environment running on a PC . The debug port is connected to the front panel board which acts as a bridge with the Chameleon main board.
22.
Alarm were indicated to the operator by annunciator horns, and lights of different colours . ( For instance, green lights meant OK, Yellow meant not OK, and Red meant BAD . ) Panel boards were usually laid out in a manner that replicated the process flow in the plant.
23.
In the days of the panel boards, a special kind of engineer was required to understand a combination of the electronic equipment associated with process measurement and control, the control algorithms necessary to control the process ( PID basics ), and the actual process that was being utilised to make the products.
