Motorola V186 - Cell Phone - GSM System Planner Manual page 19

Each DI module can be switched by the user application program to Sleep Mode. In
Sleep Mode, the module does not function and the power consumption is minimized.
During Sleep mode, the user application program will get the predefined values (PDV)
for each I/O.
The DI module can be diagnosed and monitored using the STS Hardware Test utility.
This test verifies that the module is operational, presents the module configuration and
shows the actual value of each input. It is also possible to change the input filter setup
temporarily for the duration of the Hardware Test.
In the STS Hardware Test utility, it is possible to set the DI module to Freeze Mode. In
this mode the user application program will get the predefined value of each input in the
module, instead of the actual input value. Freeze mode enables testing the inputs while
the user application program is running.
Connection of a dry contact sensor to the low voltage DI module requires "wetting" the
contact with a voltage. This can be done using the 24V DC floating plug-in power
supplies that can be added to the module. The 24V can be also used to power "wet"
**
sensors. The 24V can be also used to power "wet" sensors. (Low voltage only)
Low Voltage DI I/O Circuit Diagram:
DI Status
**
Available as of December 2007.
DI - Typical Input Circuit
33V
6.5 mA Current Limiter
15
250Ω
+ +
Full
Diode
Bridge
Rectifier
- -
Digital Input Modules
DI
COM