User's Manual

Introduction to the TTMS System
TTMS Reader
Tanker Truck Monitoring System- User’s Guide 9
1.3.1.3 AVL Reader I/O Electrical Characteristics
The following table provides the characteristics for the External Interrupt and Output.
Table 1-4. AVL Reader I/O Characteristics
I/O Type Description
External Interrupt Input Active Low
Max input voltage = ±30VDC
Max Vi
L
= 1VDC
Output Open collector general purpose output
Current must be limited to 20mA typical, 50mA
max.
Voltage max = 30V
Max VOL at 50mA = 1V
1.3.1.4 AVL Reader Block Diagram