4
User Manual
MN032EN
Effective October 2017
215U-2 802.11
wireless I/O and gateway
EATON
www.eaton.com
requirements for 115S modules are more than can be supplied by
the “+” and “–“ expansion I/O connections.
Use
Table 4
to determine the device’s current requirements at
13.8 Vdc. Remember you also need to add current for any other
equipment being powered from the same power supply, including
relays, indicators, and any additional 115S modules.
Table 4. Current requirements
Supply current at 13.8 Vdc
Base operating current
230 mA
Discrete I/O (per active input or output)
10 mA
Analog inputs and outputs (per 20 mA loop)
50 mA
Internal I/O
The internal supply voltage register locations shown in the
following table can be monitored using the Diagnostics Web page
within the module’s Web-based configuration utility (see “Product
Reconfiguration” on
page 36
for details). The values can also be
mapped to a register or an analog output on another module within
the network.
Table 5. Internal supply voltage registers
Register
Description
30005
Local supply voltage (0–40 V scaling).
30006
Local 24 V loop voltage (0–40 V scaling). Internally generated
+24 V supply used for analog loop supply. Maximum current
available is 100 mA.
30007
Local battery voltage (0–40 V scaling).
30008
115S supply voltage (0–40 V scaling).
38005–38008
Floating point registers that display the actual supply voltage,
battery voltage, +24 V supply, and 115S supply. Note that these
are actual voltage values, whereas registers 30005–30008
display a number between 8192 and 49152 that represents the
voltage scale 0–40 V.
To calculate the supply voltages from the register value use the
following calculation:
Volts = (Register Value) – 8192
1024
High and low voltage alarm indication may be configured for each of
these supply voltages. See "Analog inputs" on
page 9
for details
on how to configure these alarms.
Grounding
To provide maximum surge and lightning protection each module
should be effectively earthed/grounded via a GND terminal on the
module. This is to ensure that the surge protection circuits inside the
module are effective. The module should be connected to the same
common ground point as the enclosure ground and the antenna
mast ground.
The 215U-2 has a dedicated earth/ground connection screw on the
bottom end plate next to the supply terminals. All earth/ground
wiring should be minimum 0.8 in
2
(2 mm
2
), 14 AWG. If using the
215U-2 with serial expansion I/O modules, all expansion modules
must have a separate earth/ground connection from the front
terminal back to the common earth or ground point. See
Figure 4
.
Figure 4. Grounding
Antennas
Antennas can be either connected directly to the module’s
RF connector or connected via 50-ohm coaxial cable (such as
RG58 Cellfoil or RG213) terminated with a male SMA coaxial
connector. The higher the antenna is mounted, the greater the
transmission range, but as the length of coaxial cable increases
so do cable losses.
The net gain of an antenna and cable configuration is the gain of the
antenna (in dBi) less the loss in the coaxial cable (in dB). Maximum
net gain for the 215U-2 will depend on the licensing regulation for
the country of operation and the operating frequency.
Typical antennas gains and losses are:
Table 6. Typical antennas gains and losses
Antenna
Gain (dBi)
Dipole
2 dBi
Collinear
5 or 8 dBi
Directional (Yagi)
6–15 dBi
Cable type
Loss at 2.4GHz
RG58 cellfoil cable kits (3 m,10 m, 20 m)
-1.8dB, -6dB, -12dB
RG213 per 10 m (33 ft)
-4dB
LDF4-50 per 10 m (33 ft)
-2.2dB
The net gain of the antenna and cable configuration is determined
by adding the antenna gain and the cable loss. For example, an 8 dBi
antenna with 10 meters of Cellfoil (–6 dB) has a net gain of 2 dB
(8 dB – 6 dB).
