User's Manual

545C Operations Manual

02/10/2012 Prerelease DCN 00001789-A

high order, BIT0 through BIT15. The COLLISION bit is the same as BIT0, and

the action “COLLISION” is used instead of “SET,BIT0” for clarity.

The command EVENT,DIOHI,DTR,16,160,COLLISION defines an event that

creates a vehicle collision report if the DTR signal is high for 1 second (16

sixteenths of a second). Collision is defined as the vehicle being tipped

over. The event will clear and be ready for another event if the signal is

low for 10 seconds (160 sixteenths of a second). DIOHI means “discrete I/O

high” and DTR specifies the DTR discrete input. The parameters

DIOHI,DTR,16,160 define the event. The parameter COLLISION defines the

action.

The User will create the event table with the following commands:

Example 2: A Scanned Event - Marker-Drop

Suppose the MCC-545C is wired to detect a marker-drop pushbutton using

the CTS and DTR signals wired to a pushbutton switch mounted somewhere

in a vehicle or aircraft. The CTS output is used to enable switch detection.

The DTR input is the input signal on which marker-drop is detected.

Normally open, the switch prevents DTR from receiving the CTS signal. If

CTS is enabled and the marker-drop button pressed such that the switch

closes, the CTS signal is presented to DTR.

MCC-545 RF Modem

CTS

DTR

Marker-Drop

Switch

CTS is set on reset in order to have a signal to detect on DTR

DTR is scanned every 1/16 second for the high condition

EVENT,STOP

EVENT,DEL,ALL

EVENT,RESET,SET,CTS

EVENT,RESET,SET,BIT2

EVENT,DIOHI,DTR,16,160,COLLISION

EVENT,START

SAVE