Thanks Rob, I just want see what other ELV signal heads can be used with the ST900 because in the long run we don't want to be stuck with using equipment from a single source. With the rectified 48v output I am afraid that we may be stuck with using the Siemens Signal heads on the ST900. Best regards, Jag -----Original Message----- From: tcug-bounce@xxxxxxxxxxxxx [mailto:tcug-bounce@xxxxxxxxxxxxx] On Behalf Of R.J.Perry@xxxxxxxxxxxxxxx Sent: 29 November 2007 17:09 To: tcug@xxxxxxxxxxxxx Subject: [TCUG] Re: ELV Signals Jag The 900 drives the LED Helios heads on a half rectified 0 to -48V supply from their new LSC's. Regards Rob Perry Senior Engineer, Traffic Control and Systems=20 Dorset Engineering Consultancy, Dorset County Council Pullman Court, Station Approach, Dorchester DT1 1GA Tel 01305 225357 Fax 01305 225301 Scanned by MailDefender - managed email security from intY - www.maildefender.net ----------------------------------------------------------- A message from the TCUG mailing list. For information about the list visit //www.freelists.org/webpage/tcug ***************************************************************************= ******** The contents of the e-mail and any transmitted files are confidential and i= ntended solely for the use of the individual or entity to whom they are add= ressed. Transport for London hereby exclude any warranty and any liability = as to the quality or accuracy of the contents of this email and any attache= d transmitted files. If you are not the intended recipient be advised that = you have received this email in error and that any use, dissemination, forw= arding, printing or copying of this email is strictly prohibited., If you h= ave received this email in error please notify postmaster@xxxxxxxxxxx, This= email has been sent from Transport for London, or from one of the companie= s within its control within the meaning of Part V of the Local Government a= nd Housing Act 1989. Further details about TfL and its subsidiary companies= can be found at http://www.tfl.gov.uk/ourcompany, This footnote also confi= rms that this email message has been swept for the presence of computer vir= uses. ***************************************************************************= ******** ----------------------------------------------------------- A message from the TCUG mailing list. For information about the list visit //www.freelists.org/webpage/tcug