505U-K Radio Telemetry Module
Page 28
© April 2002
typically -10 to 50 degC. Special “industrial” batteries, such as Eveready EN91, have a
wider temperature range, -30 to 55 degC.
Operation of the 505K will stop during battery change,
however configuration of the module will
not be lost
when
batteries are removed, so no special procedure is required when
changing batteries.
Batteries should be inserted as per the drawing - with the BU-
5 aligned such that the cable comes out of the top of the
module.
The BU-5 can be mounted in any direction. The enclosure lid
can be rotated.
3.4.2
External Power
The 505K module will accept an external supply of 6 - 30 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 505K connects the negative supply
(COMMON) to “ground”. Connect the external supply as per the following diagram.
⊂
⊂
+
-
5.4 - 30 VDC
505U
EXT
SUPPLY
GND
1 amp
⊂
⊂
+
-
BATTERY
CHARGER
505U
EXT
SUPPLY
GND
1 amp
12V
BATTERY
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