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The maximum allowed external power supply for logic control is 48 volts DC. The use of current limit-
ing resistor is required for some voltages.
INPUT
VDC
External Series Resistor
5
0
6
0
12
680 @ 1/4 watt
24
1.8k @ 1/2 watt
48
3.9k @ 1 watt
Using external power supplies is the recommended method in order to avoid possible ground loops between equipment.
Take note to use current limiting resistors per Figure: 7-3 if the voltage supplied is above 6vdc. The intention is to
limit the current to 20mA for each GPI pin. If the equipment being controlled is electrically isolated, than the use of
the GPIO port's power supply is acceptable.
Telos Alliance GPIO accessory modules are designed to interface directly to the GPIO port. The DA-15 connector
on the back of an accessory module is a direct pin-to-pin match to the GPIO port of the xNode. Premade cables of
this configuration are commonly available through companies that specialize in interconnect cable assembly prod-
ucts.
The GPO portion of the GPIO ports are solid state relays. Current should be limited to a combined 100 mA through
all the pins of a port. Maximum allowed voltage is 24 volts. The following diagram shows the recommended con-
nections for outputs with the use of an external power supply.
Figure 7-3
Figure 7-4
© 2017 Telos Alliance - Rev 2.0.1
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