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T400 Controller Facilities Manual

667/EB/20200/000 Page 15-1 Issue 9

15. INPUTS AND OUTPUTS

15.1 INPUTS (I/P)

Inputs into the controller may include the following:

(i) Demands and extensions from detectors (VA and Priority).

(ii) Demands from pedestrian push-buttons.

(iii) Extensions from SDE/SA assessors.

(iv) Extensions from all-red detectors.

(v) UTC control bits.

(vi) Links from other controllers.

(vii) Hurry Call requests.

15.2 OUTPUTS (O/P)

Outputs from the controller may include the following:

(i) UTC reply bits

(ii) Links to other controllers

(iii) Monitoring Signals

(iv) Hurry Call Confirmations

(v) Special Outputs to indicate certain states within the controller (e.g.

controller fault output)

15.3 LOGIC CONDITIONS

The logic conditions of the inputs and outputs are shown in below:

NON-UTC UTC

ACTIVE INACTIVE ACTIVE INACTIVE

INPUT1010

OUTPUT1001

The logic conditions of the ports may be read via the handset using the IOP command.

The active and inactive states are configurable for each individual input by choosing

whether or not to invert them. Normally, ‘1’ is an open circuit for vehicle detectors.

15.4 PORTS

The ports of the controller provide a means of connecting the hardware of the input

and output signals to the controller software.

Each port consists of 8 bits (0 to 7) which must be either all inputs or all outputs.

In order to calculate the number of ports that are required, the inputs and outputs are

allocated, where practical, into groups of 8. It is better for configuring if all the

detectors for one phase are on the same port.

UTC inputs must be allocated different ports to detector or other inputs for software

reasons.

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