Chapter 7 Installation
7.6.8.3 Switchable sensor supply VEXT
RS232
Note:
The switchable sensor supply output is short-circuit-proof.
The switchable sensor supply VEXT
RS232
is applied to the connector of the RS232 interface (see
"Connecting the sensors, actuators and power supply" on page 60).
U
out
3,3V
I
max
180mA
7.6.8.4 Isolated switch contact (NO, CC)
Important note:
The user must ensure that the current on the isolated switch contact does not
exceed 130mA .
Equivalent circuit diagram for the isolated switch contact
I
max
130mA
U
max
32V
R
on
35Ω
f
max
1000Hz
7.6.9 Technical details about energy management
The device will work until 3,4V as intended, if the myDatalogEASY V3 is operated without an external supply
or charging voltage (V IN). The modem is deactivated from this threshold and the "UV MODEM LOCKOUT"
log entry is entered in the device log. This means that the connection is disconnected if the device is in "online"
mode or is logged in to the GSM network ("Interval & wakeup" mode). The function returns the "ERROR"
result if an attempt to establish the connection using the "rM2M_TxStart()" function is made once this
threshold is reached. The "rM2M_TxSetMode()" function also returns the "ERROR" result if an attempt to
activate "Interval & wakeup" or "online" mode is made. The Device Logic is executed as intended once this
threshold is reached.
The Device Logic execution is only stopped if the internal supply voltage falls below 2,9V and the
myDatalogEASY V3 switches to energy saving mode in which only the charge control is active. In this case,
the charge control tries to charge the rechargeable battery up to 3,8V . The "UV_LOCKOUT" log entry is also
entered in the device log when activating energy saving mode. The rechargeable battery of the power supply
unit can be charged up again if the device is in energy saving mode and an external supply or charging
voltage (V IN) is connected. Otherwise the myDatalogEASY V3 remains in this energy saving mode until the
rechargeable battery is completely discharged.
Energy saving mode is terminated and Device Logic execution is activated again, once the rechargeable
battery voltage exceeds 3,2V when recharging. The modem continues to remain inactive until the
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