PS 279 DUAL CHANNEL MASTER STATION USER MANUAL October 2013 This product is designed and manufactured by: ASL Intercom B.V. Zonnebaan 42 3542 EG Utrecht The Netherlands Phone: +31 (0)30 2411901 Fax: + 31 (0)30 2667373 E-mail: info@asl-inter.com Web: www.asl-inter.
CONTENT OF THIS USER MANUAL 1.0 SAFETY INSTRUCTIONS........................................................................ 3 2.0 GENERAL DESCRIPTION PS 279 .......................................................... 4 3.0 MAINS POWER........................................................................................ 4 4.0 MECHANICAL INSTALLATION................................................................ 5 5.0 FRONT PANEL CONTROLS AND CONNECTOR ................................... 5 6.
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. 2) Retain all safety and operating instructions for future reference. 3) Heed all warnings on the apparatus and in the safety and operating instructions and follow all instructions for installation, operating and use. 4) Unplug the apparatus from the AC power outlet before cleaning.
2.0 GENERAL DESCRIPTION PS 279 The PS 279 (19”/1RU) is designed to be a dual channel master unit in an ASL intercom system. To connect the unit to its remote stations, use microphone cable with 2 wires and 1 shield. Each channel has a Volume (listen level) control, a TALK and a CALL button with LED indicators and a side tone trimmer. The intercom line power supply is fully protected and can safely drive up to 20 Pro Series beltpacks or 10 remote 2-ch speaker stations operating at full power.
4.0 MECHANICAL INSTALLATION A vertical rack space of 1U (1.75” / 44,5 mm) is required for the PS 279. It is not necessary to provide rear support by extra bracing or shelving. Adequate ventilation must be provided by allowing sufficient space around the sides and rear of the nit to ensure free circulation of air. 5.0 Forced cooling is not required. The power supply is mounted on the bottom of the PS 279. After a period of time it will feel hot to the touch on top and bottom.
13 SIDE TONE trimmers To adjust the level of one’s own voice as heard in one’s headset. Adjustment procedure: • set the trimmer in start position: fully clockwise • switch off the microphone of all connected (speaker) stations • switch on the microphone of the required channel • turn up the volume of the required channel • speak into the headset microphone • adjust the listen level by turning the side tone trimmer The operating area is between fully clockwise and minimum level.
19 A & B LINE connectors These XLR-3 connectors are for connecting the PS 279 to remote stations via the intercom party lines. There are 2 connectors for each channel. Pin assignment: Pin 1: 0V / ground shield Pin 2: +30V power. Pin 3: audio wire 20 GROUND LIFT switch If in “lift” position pin 1 of the AUX input XLR is lifted from ground. 21 AUX INPUT connector Electronically balanced input for line level audio signals. Pin assignment: Pin1: 0 V / ground Pin 2: signal (+), Pin 3: signal ( -) 7.
9.0 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.
11.0 EARTHING CONCEPT 12.
13.
