6
Power and Signal Connections
Power can be supplied to your M Series meter through either the power jack (power jack not available
on CSA/ATEX approved devices) or the 8 pin Mini-DIN connector as shown in Figure 1. An AC to DC
adapter which converts line AC power to DC voltage between 7 and 30 volts is required to use the
power jack (Note: minimum 15Vdc required for 4-20mA outputs). The adapter current should be at least
100mA. The power jack accepts 2.1 mm female power plugs with positive centers. Cables and AC/DC
adaptors maybe purchased from Alicat (see Accessories page 42) and are commonly available at local
electronics suppliers. Alternatively, power can be supplied through the Mini-DIN connector as shown
below:
7 8
1 2
3 4 5
AC/DC Adapter Jack
6
1
3
2
4 5
6
7
8
Pin Function
Mini-DIN
cable color
1
Inactive or 4-20mA Primary Output Signal Black
2
Static 5.12 Vdc or Secondary Analog Output (4-20mA, 5Vdc, 10Vdc) or
Basic Alarm
Brown
3 RS-232 Input Signal Red
4 Analog Input Signal = Remote Tare (Ground to Tare) Orange
5 RS-232 Output Signal Yellow
6
0-5 Vdc (or 0-10 Vdc) Output Signal Green
7 Power In (7-30 Vdc, 100mA) or (15-30Vdc for 4-20mA units) Blue
8 Ground (common for power, communications and signals) Purple
Note: The above pin-out is applicable to all the fl ow meters and controllers available with the Mini-DIN
connector. The availability of different output signals depends on the fl ow meter options ordered.
Underlined Items in the above table are optional confi gurations that are noted on the unit’s calibration
sheet.
Figure 1. 8 Pin Mini-DIN Connector
CAUTION: Do not connect power to pins 1 through 6 as permanent damage can occur!
Note: Upon initial review of the pin out diagram in Figure 1, it is common to mistake Pin 2 (labeled 5.12
Vdc Output) as the standard 0-5 Vdc analog output signal! In fact Pin 2 is normally a constant 5.12 Vdc
that refl ects the system bus voltage and can be used as a source for the set-point signal.
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