Antennas
15-7
The 090 Reading Head can be mounted on any suitable
surface using the two 4mm diameter mounting holes.
2. The Reading Head should be mounted with its connector at the
bottom. Mark out and drill the two mounting holes. Don’t fix
the Reading Head to the wall yet. The holes accept No6/M3.5
screws - countersunk or pan/round head.
3. The 090 Reading Head requires cable to connect it to the Cotag
reader module. We recommend that you use 812 cable.
Alternatively, the Tx and Rx lines should use screened twisted
pair cables with 0.38mm
2
(22AWG) conductors. This
corresponds to Belden 8723 for twin twisted pair. Use any
suitable screened 3-core cable for the LEDs, eg Belden 9533
for 24AWG.
The maximum distance between the Controller and the
Reading Head using 812 cable is 300 metres, or 200 metres
for Belden 8723. The cable screens should be connected at the
Controller, but must not be connected at the Reading Head
end, either to each other or to anything else: they should be
cut back and insulated. For details of how to connect the cable
screens see the chapter on “Earthing and screening”.
4. Connect the cables as shown in the next section, “Connecting
the 090 Reading Head”. There are three knockouts in the
bottom and sides of the 090 Reading Head for routing the
cables if required.
Note: if the 090 Reading Head is installed outside, to avoid
corrosion on terminals apply a suitable compound, for
example silicone grease. If the exposure to water is likely to be
very severe, remove the bottom cable knockout so that
moisture can drain away from the terminals.
5. Screw the Reading Head in position on the wall.
6. Use a Field Meter or Test Card to check that the 090 is
working correctly. Make sure it is mounted securely before
sticking the self-adhesive label to the front. Make sure you get
the label the right way up or the LEDs will not be visible.
To Next Page
Loading...