GuidePort – EMP System Manual Version 1.0 of 27 July 2000 Sennheiser electronic GmbH & Co.
1 GuidePort Wireless Audio Transmission GuidePort is a local area broadcast system for use in museums, visitor centers and at exhibitions. GuidePort features a characteristic cell structure, the so-called cells being defined areas of information and entertainment. These areas are supplied by Cell Transmitters which send digitally coded information via an Active Antenna Unit to portable Receivers. The transmitted data can be any audio information, for example comments or music.
GuidePort Installation INST. No. 2 GuidePort Installation INST. No. 1 GuidePort Installation INST. No. 3 cell 1 cell 3 cell 2 … cell 255 cell 4 cell 5 Event 1 Event 3 One installation can handle up to 255 events which may be organized in up to 255 cells Event 2 GuidePort Cell with one or more Cell Transmitters Event 5 Event 4 Event 6 Event N One cell transmitter can handle up to 4 mono audio channels and transmit them on one RF channel GuidePort System Hierarchy GuidePort: System Manual 27.
Central Unit PC with • GP Central Unit Software • Sound card with a sampling rate of 32 kHz • G7++ converter and announcement software Supervisor PC Network Base Station PC with Cell Transmitter Loader Software Base Station PC with Cell Transmitter Loader Software Base Station PC with Cell Transmitter Loader Software USB USB Hub Technical room 1 USB Hub USB Audio Source 1 -4 Cell Transmitter Event #2 Event #1 Exhibition room 1 Exhibition room 6 Cell Transmitter LVDS LVDS Exhibition room 7
2 Hardware Components of the System 2.1 Central Unit PC The Central Unit PC with its Central Unit Software is at the heart of the GuidePort system. It serves to configure the entire GuidePort installation with its cells, transmitters, events and identifiers. Via a network, the Central Unit PC is connected with all Base Station PCs of the GuidePort installation. 2.
2.3.2 a) Hardware Interfaces Front panel GuidePort SR 3000-2 TX I TX II SET SET Headphone Outputs Allow you to monitor the audio signals transmitted to the receivers. b) Rear panel TX II 0 TX I AAU OUT USB IN TIP: + ANALOG IN SYM. AAU OUT USB IN RING: - TIP: + ANALOG IN SYM. RING: - I 1 2 3 4 2 1 3 4 USB IN: Input socket for the USB cable from the Base Station PC. ANALOG IN SYM.: Inputs for connecting your audio sources to the transmitter.
2.3.3 User Interface (Display and Controls) Menu layout of the GuidePort Cell Transmitter: TX OK N.B.: If there is no input for about 90 secs the display will show “TX OK” SET CCU ID xxx SET AAU SETTINGS SET RF CHxx 1...95 NC EXT ANT xx ON OFF NC MTS xx 01 02 OFF SET AAU 01 AAU 02 AAU 08 SET SET RF ATTEN xx SET 00...06 SET RTA ID SET CH 01 {event name} { event ID} SET CH 02 {event name} { event ID} SET CH 12 {event name} { event ID} e.g. CH 01 Jimi Hendrix 005 N.B.
2.3.4 Technical Data AF IN Frequency Input level Impedance Audio sources 40 - 14,000 660 4 mono 2 stereo Hz mVrms Ω 1 stereo, 2 mono balanced input AF IN 1, 2, 3, 4 AF IN 1&2 (1 = left, 2 = right) 3&4; (3 = left, 4 = right) AF IN 1&2 or 3&4 (stereo); remaining inputs for mono sources USB IN AAU OUT DC output Imax Data rate Output level Headphone Output Output level Output impedance GuidePort: System Manual +15 200 1,024 350 V mA Mbit/s mVpp 32 mVpp Ω 27.
2.2 Active Antenna Unit 2.2.1 Description The Active Antenna Unit receives the data stream from the Cell Transmitter via an LVDS interface. The data stream is then FSK modulated onto an RF carrier in the 2.4 GHz ISM Band and transmitted to the GuidePort receivers. Settings for transmission frequency, RF output power and the antenna to be used (internal or external antenna) are controlled by the Cell Transmitter. 2.2.
2.2.4 Available RF Channels The following RF Channels can be chosen when configuring the Active Antenna Unit via the Central Unit Software. The highlighted channels (grey) are preferred channels. Please do not forget a minimum channel spacing of 3 channels within one cell. RF Ch. Frequency [MHz] RF Ch. Frequency [MHz] RF Ch. Frequency [MHz] 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 2401.920 2402.784 2403.648 2404.512 2405.376 2406.240 2407.104 2407.
2.2.5 Technical Data RF transmission frequency range f 2.4 - 2.4835 GHz Max. radiated RF peak power P 1 mW 0 dBm 10 mW 10 dBm P RF antenna RF channel bandwidth f Total number of RF channels Transmission range of cell transmitter for quasi error-free reception, no walls chip antenna, mounted on board external directional, wall-mounted antenna (opt.) 2.
2.3 Receiver 2.3.1 Description The GuidePort Receiver automatically reacts to the magnetic fields created by Identifier Transmitters (see 2.4). These Identifiers transmit a number which is related to a certain audio event. When receiving this number, the receiver will transfer the corresponding audio information to the Mollie System. Mollie then decides on the action to be taken, for example to play the audio information.
Reset IRQA DSP PB9 SCLK 56 303 Interrupt_1 Frame Clock Interrupt_2 8 Mollie Data PB0.....PB7 PB8 Read/Write DGND AGND GuidePort Receiver PCB analog audio L analog audio R 5 Volt, analog 3.3 Volt, digital Logical level of all digital lines: Interface Connector GP receiver: according to LVTTL (3.3V) JST flat multicore cable, type 24FLZ-SM1-TB Pin Assignment of Interface Connector 24FLZ-SM1-TB: Pin No.
Mounting of PCB and Position of Connectors: It is of the utmost importance to mount the GP receiver board in a vertical position: Pin 24 24FLZ connector for GP/Mollie interface Pin 1 Cable direction Identifier coil Connectors for RF antennas 'Reset': reset is active when 'low', internal connection on GuidePort receiver PCB: MR of MAX811 (pin 3) 'Interrupt_1 ': Interrupt_1 is active when 'low'. Mollie’s read or write procedures always start with the interrupt request.
Specification for the Reset Procedure between GuidePort/EMP and Mollie Simplified hardware diagram: Mollie GP Reset line from Mollie Reset for DSP56303 Master Reset Reset IC Max 811 Vcc 10k Interrupt_1 IRQA of DSP 3.3 VDC for digital circuit Remark: Other lines of the GP/Mollie interface are not of interest for this subject. 1. Case: Power is switched on When the 3.3 V power line becomes high the IC Max811 generates a ≈ 280 ms reset impulse. power DSP reset 285ms 40ms IRQA receiver ready 2.
2.3.3 Technical Data RF receiving frequency range f 2.4 - 2.4835 GHz Input sensitivity at antenna input P -93 dBm RF antenna connector -3 BER 10 MMS female Input impedance 50 Ω Power supply Analog Voltage U 5 V Max. current I 110 mA Digital U 3.3 V Max. current I 120 mA Headphones RL 32 Ω 10% tolerance 10% tolerance AF output Max. AF output level UOUT Vrms fin = 1 kHz, Uin 350 mVrms at Cell Transmitter, RL = 32 Ω Frequency response GuidePort: System Manual f 40 ..
2.4 Identifier Transmitter 2.4.1 Description The Identifier transmits a binary code, which enables the GuidePort receivers to identify the audio event belonging to it. The identifier transmitter is programmable via a palmtop with the necessary GuidePort software. The parameters to be programmed are identifier number, transmission power, and the times for switching the identifier transmission on and off. The Identifier is fitted with two LEDs which indicate its operating states (see below).
2.4.2 Technical Data Transmission frequency f Modulation type 127 kHz 2 - FSK FM deviation 4 kHz Data rate 8 kbit/s Maximum transmission range with internal antenna 3m Maximum area covered by external induction loop 9 sq.m. Power supply* External DC 4 AA-size batteries Operating time with batteries 7.5 – 15 1.
3 Software 3.1 Central Unit Software The Central Unit Software runs on the Central Unit PC. It serves to configure the entire GuidePort installation with its cells, transmitters, events and identifiers. 3.2 Cell Transmitter Loader Software The Cell Transmitter Loader Software runs on the Base Stations. Via a USB, the software detects the IDs of all Cell Transmitters connected to a Base Station.