4101-2 Controller Installation Handbook
15-4
Mounting
1. Choose a suitable position to mount the 280 Reading Head
near the door.
• If people wear their Cards at the hip, mount the Reading Head
at a height of 90cm from the floor to the centre of the Reading
Head.
• If people wear their Cards at the lapel or breast pocket, mount
it at a height of 120cm from the floor to the centre of the
Reading Head.
• If people do not wear their Cards in a consistent place then
mounting the Reading Head at a height of 110cm is a good
compromise.
2. The Reading Head should be mounted with the LEDs at the
top. Mark out and drill the four mounting holes. Don’t fix the
Reading Head to the wall yet. The holes accept 4mm machine
screws or No 10 wood screws.
3. The 280 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 5-core cable for the LEDs and horn, eg
Belden 9535 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”.
Route the cables into the Reading Head through the holes
provided in the bottom or rear. There are also two knock-out
panels in the moulding if you prefer to route the cables in
through the side.
4. Pass the cables through the cable clamps in the 280 Reading
Head.
5. Connect the cables as shown in the next section, “Connecting
the 280 Reading Head”.
6. Screw the Reading Head in position on the wall, taking care
not to damage the antenna coils. The Reading Head should
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