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3.6 Sensor Installation
3.6.1 Signal state definitions
The idle, marking, logical 1, OFF or stop bit state is defined by a negative voltage on line A
with respect to line B, as in IEC 61162-1.
The active, spacing, logical 0, ON or start bit state is defined by a positive voltage on line A
with respect to line B, as in IEC 61162-1.
3.6.2 Talker drive circuits
The drive circuit meets the requirements of ITU-T V.11. The maximum output current is
I
= 50mA on each port.
max
3.6.3 Listener receive circuits
Multiple listeners may be connected to a single talker. The listener's receive circuit complies
with ITU-T V.11. Optional termination resistors (120Ohm) for the Input-lines are provided in
the Connection Box. The input terminals A, B and C are electrically isolated from the
remaining electronics of the listening device.
The input impedance is 30kOhm between A and B lines without the termination resistors. The
minimum input voltage is ±0,3V.
3.6.4
Electrical isolation
Within a listener there are no direct electrical connection between the signal lines A and B,
the signal ground C or the shield to ship's mains ground or power line. This isolation is in
accordance with IEC 60945.
3.6.5 Maximum voltage on the bus
The maximum applied voltage between signal lines A and B and between either line and
ground C is in accordance with ITU-T V.11. For protection against miswiring and for
unintended connection to earlier TALKER designs, all receive circuit devices are capable of
withstanding 15 V between both lines and signal ground for an indefinite period.
3.6.6
Data transmission
Data is transmitted in serial asynchronous form in accordance with 1.2. The first bit is a start
bit and is followed by data bits, least-significant-bit first.
The following parameters are used:
– baud rate 38 400 (bits/s) resp. 4 800 (bits/s)
– data bits 8 (D7 = 0), parity none;
– stop bits 1.
13
TM
GlobalWatch
UAIS Installation Manual
Y1-03-0177A
Version 1.0
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