User's Manual

905U-K Radio Telemetry Module User Manual
 ELPRO Technologies Pty Ltd 2001 Page 24
Power Supply Installation
3.4.1 External Power
The 905U-K module will accept an external supply of 5.4 - 30.0 volts DC. An external supply
with a battery and battery charger is suitable. Negatively grounded or floating supplies are
acceptable, however positively grounded supplies must not be connected. The 905U-K
connects the negative supply (COMMON) to “ground”. Connect the external supply as per
the following diagram.
⊂
⊂
+
-
5.4 - 30 VDC
905U-K
EXT
SUPPLY
GND
1 A
⊂
⊂
+
-
BATTERY
CHARGER
905U-K
EXT
SUPPLY
GND
1 A
12V
BATTERY
Configuration of the module will not be lost when batteries are removed, so no special
procedure is required when changing batteries of the same type.
3.5 Input Signal Connections
3.5.1 Digital/Pulse Inputs
Digital and pulse inputs share the same input channel. Each input is connected between the
DIN connector and COMMON. Inputs can be voltage-free contacts, NPN transistor
switches, or a voltage signal (ON < 1 volt DC, OFF > 2 volts DC).
⊂
GND
905U-K
DIN1
⊂
⊂
GND
905U-K
DIN1
⊂
⊂
DIN2
Inputs can be voltage free contact or open-collector transistor
NPN