Specifications

ST900 Family General Handbook
667/HB/32900/000 Issue 11 Page 212 of 265
2
2
9
9
I
I
N
N
P
P
U
U
T
T
S
S
A
A
N
N
D
D
O
O
U
U
T
T
P
P
U
U
T
T
S
S
29.1 Inputs (I/P)
Inputs into the controller may include the following (refer to the sections given for
more information):
(i) Section 7 – Demands and extensions from detectors
(ii) Section 8 – Call/Cancel detectors
(iii) Section 9 – Extensions from SDE/SA assessors
(iv) Section 10 – Extensions from all-red detectors
(v) Section 15 – UTC control bits
(vi) Section 16 – Priority Vehicle detectors
(vii) Section 17 – Hurry Call requests
(viii) Section 27 – Links from other controllers
(ix) Section 29.8 – Solar cell input
29.2 Outputs (O/P)
Outputs from the controller may include the following:
(i) Section 15 – UTC reply bits
(ii) Section 17 – Hurry Call Confirmations
(iii) Section 27 – Links to other controllers
29.3 Logic Conditions
The physical (and logic) states of the inputs and outputs are shown below:
NON-UTC UTC
INPUTS OUTPUTS INPUTS OUTPUTS
ACTIVE CLOSED (1) CLOSED (1) CLOSED (1) OPEN (0)
INACTIVE OPEN (0) OPEN (0) OPEN (0) CLOSED (1)
Table 23 – Input and Output States
The logic conditions of the ports may be read via the handset using the IOP
command. The active and inactive states for each input or output are configurable
by choosing whether or not to invert them.