Specifications

Siemens Mobility, Traffic Solutions

Sopers Lane, Poole, Dorset

BH17 7ER

Version 10 Page 36 of 120 Status Issued

Last Editor harry.smyth Date 03 November 2014

Document

Name

GENERAL HANDBOOK FOR HEIMDALL

DETECTORS

Doc. No. 667/HB/31900/000

4.9 Heimdall Serial Communications Installation (SiTOS)

The Heimdall Detector can be equipped with a serial communications facility to enable

the detector status, configuration parameters and vehicle data (if appropriate) to be

requested by a SiTOS enabled host controller (equipment).

This facility utilises the industry standard RS485 two wire serial communication

technique. A number of detectors can be attached to a common pair of wires and can be

interrogated on an individual basis. To achieve this it is necessary to assign a unique

address to each detector on the common pair using the dual-in-line switch located on the

special serial interface card (see Table 4-7 for details).

Hello

SiTOS DIP Switch Number

1 2 3 4 5 6 7 8

Line

Termination

0 = Disabled

1 = Enabled

Not Used (SW4 = MS bit, SW8 = LS bit)

Detector Address:

0,0,0,0,0 = Address 0 (00h)

0,0,0,0,1 = Address 1 (01h)

1,1,1,1,1 = Address 31 (1Fh)

Table 4-7 – Serial Communication (SiTOS) Configuration Switches

Note: Some DIP switches may be marked with ON/OFF. For the purposes of

definition, OFF is equal to 0 and ON is equal to 1.

Each detector address should be set in accordance with the installation information

supplied with the host equipment. This will also define when the ‘Line Termination’ switch

(SW 1) should be used.