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GPI OUTPUT CONNECTIONS
The GPI Output connections also appear on the 15-pin RS-232/GPI connector.
These outputs are 74HC-series outputs.
They may be used to drive CMOS or TTL-
compatible 5-volt inputs only. They are not suitable for pulling down 24v, driving
relays (other than low-power 5v relays), or other types of interface.
There are five outputs, with the following assignments:
GPI Out 0 - Triggered when Ch A exits a multi-point loop
GPI Out 1 - Triggered when Ch B exits a multi-point loop
GPI Out 2 - Triggered when Ch C exits a multi-point loop
GPI Out 3 - Triggered when Ch D exits a multi-point loop
GPI Out 4 - Triggered when A,B,C or D exits a multi-point loop
DIPSWITCH FUNCTIONS
There is an 8-position DIP Switch on the rear of the rack-mount frame. These
should all normally be in the OFF or down position. The functions of these switches
are described below.
Sw 1 - ON inhibits the CLEAR ALL register function from the control panel
Sw 2 - ON causes menu items to be reset to defaults when all reg are cleared
Sw 3 - On inhibits the ‘No Ext Reference’ message on the panel display
Sw 4 - not used
Sw 5 - not used
Sw 6 - not used
Sw 7 – When SW7 and SW8 are both on, the TDC will do a complete memory
Sw 8 – clear to all zeros at power-up. This is a factory test feature.
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