BS 181 SINGLE CHANNEL POWER SUPPLY USER MANUAL May 2013 This product is designed and manufactured by: ASL Intercom B.V. Zonnebaan 42 3542 EG Utrecht The Netherlands Tel: +31 (0)30 2411901 Fax: +31 (0)30 2667373 Email: info@asl-inter.com Web: www.asl-inter.
CONTENT OF THIS USER MANUAL 1.0 SAFETY INSTRUCTIONS ................................ 3 2.0 GENERAL DESCRIPTION BS 181 ......................... 4 3.0 MECHANICAL INSTALLATION ............................ 4 4.0 MAINS POWER ........................................ 4 6.0 REAR PANEL CONTROLS & CONNECTORS ................. 5 7.0 TECHNICAL SPECIFICATIONS BS 181 ..................... 5 8.0 PARTY LINE, TECHNICAL CONCEPT ....................... 6 9.0 CABLING ............................................
1.0 SAFETY INSTRUCTIONS Please always follow these instructions to help ensure against injury to yourself and/or damage to the system 1. Read all safety and operating instructions before you operate the apparatus. 1. Retain all safety and operating instructions for future reference. 2. Heed all warnings on the apparatus and in the safety and operating instructions and follow all installation and use instructions. 3. Unplug the apparatus from the AC power outlet before cleaning.
2.0 GENERAL DESCRIPTION BS 181 The BS 181 is designed to be a power supply in an ASL intercom system and can be used in portable as well as fixed applications. 3.0 MECHANICAL INSTALLATION Adequate ventilation must be provided by allowing sufficient space around the sides and rear of the unit to ensure free circulation of air. Forced cooling is not required. 4.0 After a period of time the unit will feel warm to the touch. This is quite normal, and should be no cause for alarm.
6.0 REAR PANEL CONTROLS & CONNECTORS 3 INTERCOM LINE connectors These two XLR-3 connectors are for connecting the user stations, via standard microphone cable. Pin assignments: Pin 1: 0 V / ground shield Pin 2: +30 V power wire Pin 3: audio wire 4 FUSE holder A fuse protects the BS 181 against severe internal damage in case of malfunction in the power section. Disconnected the power cord before replacing the fuse.
8.0 PARTY LINE, TECHNICAL CONCEPT User stations in an ASL intercom system are connected via one or several 'party lines'. A party line offers two way (‘full duplex’) communication and consists of standard microphone (multi-pair) cable. One wire is used as an audio line, one as a power line and the screen of the cable functions as earth/return. Current drive is used for signal transfer.
10.0 BLOCK DIAGRAM BS 181 11.
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