4 Position of Connectors and Functions of VPNRouter iR 5221 and VPNRouter iR 3220
4.3.1. Digital Input
The VPNRouter provides four digital input channels. The signals IN 0 to IN 3 are located on clamps
2 to 5 of the terminal block, the reference GND is on clamp 6. A signal change on an input channel
will generate an interrupt.
Input High TTL level (2.0 to 5.0V)
Input Low
TTL level (0.0 to 0.8V)
Table 6: Digital Input: Electrical Characteristics
4.3.2. Digital Output
The VPNRouter provides four digital output channels. The signals OUT 0 to OUT 3 are located on
clamps 7 to 10 of the terminal block, the reference GND is on clamp 6 and 11. The output ports
can source some milliAmpere output in High status, with decreasing voltage when the current rises.
In Low status they can sink signicant current, enough to drive small relays.
Output High Source 32mA@TTL (2.0 to 5.0V)
Output Low
Sink 64mA@TTL (0.0 to 0.6V)
Table 7: Digital Output: Electrical Characteristics
4.3.3. I²C Interface
The I²C interface operates with a maximum frequency of 400 kHz (Fast Mode). The connector
for I²C is located on the terminal digital I/O block and has three contacts: SCL, SDA and GND
(clamps 11 to 13). When required the I²C device can be powered with the VCC auxiliary output
of the digital I/O terminal block.
4.3.4. Auxiliary Power
+5V is an auxiliary power output of 5V DC, for max. 500 milliAmpere. This may be used to drive
special driver circuits connected at Digital-I/O. For e5V may drive a relay controlled by
the output signals, or power a small I²C-controlled display. The GND for auxiliary power is on
clamps 6 and 11.
4.4. Antenna Locations
The VPNRouter is prepared for adding two antenna sockets of the usual SMA
type. These may be used for functions like WLAN, UMTS/LTE wireless or
GPS receivers. The positions are covered by plastic caps. Both antenna
positions are on the top side of VPNRouter iR 5221/VPNRouter iR 3220.
Figure 10: Antenna
location
Juli 2016
VPNRouter Software Manual
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