Specifications

GEMINI
2
Traffic Outstation Handbook
667/HB/32600/000 Page 61 Issue 11
When a fault or other defined event is detected, it is logged at the unit and a call is
made to the Instation to report the occurrence. If required, particular types of fault or
event can be configured as “non urgent” so that these are logged but not reported to the
Instation, unless a more urgent fault is detected or a call is made from the Instation.
Integral n+1 count units allow simple detector equipment to be used to monitor traffic
flows, which are reported to the Instation automatically or on operator request.
Direct connection to a wide range of traffic controllers via their handset port allows an
operator at the Instation to interrogate the controller remotely and make changes to the
controller operation.
Variable Message Signs and access control equipment such as barriers may also be
controlled.
4.4.2 Bus Priority and Access Control
When used for Bus Priority and access control applications, the GSM OMCU is able to
connect up to 12 SIETAG readers using a suitable I/O board to provide logging, priority
and access control functions.
Vehicles to be given access / priority are fitted with an electronic tag that may be
programmed with, among other things, vehicle operator identification and individual
vehicle number. A loop is located in each access lane, which is used by a SIETAG
reader to interrogate tags as they pass over.
Data from the tags may be filtered by the GSM OMCU, which logs the information and
can be programmed to output access requests to barriers or other equipment such as
Traffic Controllers, via up to 16 isolated relay contacts. (These may be expanded up to
48 by the addition of extra I/O boards.)
Several levels of filtering may be configured from the Instation and downloaded to the
GSM OMCU. Filtering options range from specific access or priority just for uniquely
identified vehicles through to all vehicles of a particular operator. Access / priority may
be restricted by time of day and individual or groups of vehicles may be blacklisted.
Bus Processor and OMCU functions can be performed simultaneously, limited only by
the number of I/O boards that can be accommodated.
4.5 Ethernet OMCU
The OMCU may also be connected to the RMS instation via an Ethernet connection.
Once an IP address has been assigned to the OMCU it can then be configured to
operate as a Gemini OMCU with communication to the RMS instation across a network.
Initially the IP address must be setup manually using the IPM handset command to
setup a static IP address and then IPR=2 to activate the IPM settings. This will most
probably be done locally via the handset port, though it could be done remotely if a
modem is fitted. Once the IP address has been assigned configuration data that