M2M CONTROL C660 - Technical Manual V2.00
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Page 10 of 36
Power supply
The M2M Control C660 device must be supplied with 8..36 VDC from an external DC power
source connected to the X1 connector. Positive power is applied to the SUPP pin, and ground is
connected to the PGND pin.
The connector has two “SUPP” supply pins as these also supplies power to the digital outputs. If
the total current consumption on the digital outputs exceeds 5A, then power must be applied to
both pins. Otherwise one pin is sufficient.
There are three different labels for the ground connections:
Power Ground (PGND)
Signal Ground (SGND)
Analog Ground (AGND)
The signal and analog grounds are filtered from the power ground. Power ground must only be
used as power supply return path. The signal ground is used as ground reference for digital I/O’s
and serial interfaces, and the analog ground is used as a low noise analog ground reference for the
analog inputs.
The C660 is protected against wrong polarity. If a chassis or system ground is connected to either
SGND or AGND, a wrong polarity on the supply lines will destroy the internal GND connection.
For avoidance of such a scenario, a fuse can be installed on the positive supply.
The C660 also contains an internal high capacity backup battery which will supply the C660 if the
external power supply fails or is disconnected. By default the C660 is powered down when a
power fail occurs. This setting, however, can be changed. Please consult the M2M CONTROL IDE
on-line help for more information. The display will automatically turn off when external power is
removed.
Disabling the external DC power from the application interface and forcing the device to operate
on the internal backup battery is supported. Please consult the M2M CONTROL IDE
documentation for additional information.
When the ignition input is activated with a logical high, the C660 unit will wake-up if it was in
power down mode. The ignition input (digital input 5) is available on the power connector to
minimize the need for connectors in minimal installations, but it is also available on the X3
connector (digital I/O and analog Inputs) - only one should be used at a time.
X1: 4 pin PWR connector overview
Pin
Name
Description
1
SUPP
Power supply, positive (+) connection
2
DI5/IGN
Digital input 5 / Ignition input (Shared with X3)
3
SUPP
Power supply, positive (+) connection
4
PGND
Power Ground