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Summary of Contents for ASCOM T942C
- Page 1 TD 91684GB Installation Guide T942C and T942C/2 Central Unit 16 April 2015 / Ver. G...
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Page 2: Table Of Contents
Installation Guide TD 91684GB T942C and T942C/2 Central Unit Contents 1 Central Unit T942C ......................1 1.1 Regulatory Compliance Statements (EU/EFTA only) ............2 1.2 Regulatory Compliance Statements (USA only) .............. 2 1.3 Board Description ........................3 1.4 Installation ..........................6 1.4.1 Mounting .......................... - Page 3 Installation Guide TD 91684GB T942C and T942C/2 Central Unit 3.2 Configuration.......................... 24 3.2.1 Set License ........................25 4 Document History ......................26 16 April 2015 / Ver. G...
- Page 4 T942C and T942C/2 Central Unit Central Unit T942C T942C is used in the Ascom Paging System. T942C controls all communication on the system bus and data buses. The Central Unit also generates code to all H/U952T Terminal Transmitters and enables parallel operation of separate installations. All the inputs and outputs have transient protection, and all bus connections are equipped with chokes for increased EMC protection.
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Page 5: Central Unit T942C
• FP5 Fuse board 1.25A Optional equipment that may be required: • A PC can be connected to 8-pin modular connector J09 on the T942C for RS232C communication. Adapters can be ordered from Ascom for 9-pin and 25-pin D-sub connectors. See 1.4.10 Connection of PC... - Page 6 Installation Guide TD 91684GB T942C and T942C/2 Central Unit Information to User This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.
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Page 7: Board Description
Installation Guide TD 91684GB T942C and T942C/2 Central Unit Board Description LEDO1 IC13 SWO1 IC20 ICO1 IC14 BAT1 IC21 ICO8 IC22 SWO2 LEDO2 IC50 IC54 IC23 LEDO9 IC56 IC57 942C Figure 3. T942C circuit board. 16 April 2015 / Ver. G... - Page 8 AUX RELAY RE02. (2-3 selects normally open contact.) Not used. S17A Jumper. Always set to 2-3 to select RS485 for the Ascom Paging System. S17B Jumper. Always set to 1-2 to select RS485 for the Ascom Paging System.
- Page 9 Installation Guide TD 91684GB T942C and T942C/2 Central Unit Switches SW01 Address selector switch for the C-bus. If the setting of SW1 is changed the Central Unit must be restarted for the change to become effective. SW02 If the settings of sections 1, 3 or 4 on switch SW2 are changed, the Central Unit must be restarted for the change to become effective.
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Page 10: Installation
Installation Guide TD 91684GB T942C and T942C/2 Central Unit Installation T942C should be placed in a dry environment with a temperature range of 0 to +40°C. 1.4.1 Mounting IMPORTANT: The unit must be mounted by trained personnel. IMPORTANT: The unit must be mounted to a solid vertical wall with the bottom facing the floor. -
Page 11: Opening The Housing
Installation Guide TD 91684GB T942C and T942C/2 Central Unit 1.4.2 Opening the Housing Use a screwdriver or similar to release the cover by applying a light pressure to the two snap catches (1) and remove the cover (2). Figure 5. Releasing the cover. -
Page 12: Mounting Together With Other Units
Installation Guide TD 91684GB T942C and T942C/2 Central Unit When the holes are opened, a screwdriver can be used to open the lid. Apply a slight downward pressure (1), then gently lever the screwdriver downwards (2), the clips which hold the lid will then be released and the cover can be removed (3). -
Page 13: Wiring Runs
Installation Guide TD 91684GB T942C and T942C/2 Central Unit 1.4.4 Wiring Runs Wiring can be run three ways from the unit: • Remove the rectangular covers and run the cabling out through the side (1). • Run the cabling through the round holes at the back of the case (2). -
Page 14: Addressing
Use the slots at the opening to secure the wiring with cable straps. 1.4.5 Addressing Assign the T942C an address on the C-bus by setting address switch SW01 hexadecimally. See the System Installation document, chapter Addressing. SW01 Figure 11. Addressing on T942C •... -
Page 15: Connection Of Buses
Installation Guide TD 91684GB T942C and T942C/2 Central Unit 1.4.6 Connection of Buses Buses are connected either via modular bus cabling or twisted-pairs. NOTE: The data buses are polarized. Use only twisted-pairs for two-wire connections! Bus connection via Modular Bus Cabling figure 12 on page 12 for information about modular bus connectors. -
Page 16: Connection Of Supply Voltage
Installation Guide TD 91684GB T942C and T942C/2 Central Unit 1.4.7 Connection of Supply Voltage Add the FP5 Fuse board 1.25A, a very-fast acting (FF) fuse, to the circuit board, in between connector J03 and the screw terminal. Connect the supply voltage to connector J03 screw 1 and 2. -
Page 17: Connection Of Reference Module In A Fl-System (Used Only In Paging Systems)
Installation Guide TD 91684GB T942C and T942C/2 Central Unit 1.4.8 Connection of Reference Module in a FL-System (used only in paging systems) Connect a twisted-pair from connector J12 screw 6 and 2 to Reference Module T938RM connector J04 screw 5 and 6, respectively (polarized!). -
Page 18: Connection Of Pc
NOTE: Note that on modems with 25-pin D-sub connectors, the RTS and CTS signals must be jumpered - i.e. pin 4 to 5. Adapters with the correct connections can be ordered from Ascom for both the 9-pin and 25-pin D-sub connectors. -
Page 19: Relay Output For System Fault Indication
Installation Guide TD 91684GB T942C and T942C/2 Central Unit 1.4.11 Relay Output for System Fault Indication A relay output on connector J10 is used to indicate Central Unit malfunction and can also be used to indicate system fault (e.g. system fault can be when a module drops out or reports an error). -
Page 20: Activation Of Power Changeover Circuit
Installation Guide TD 91684GB T942C and T942C/2 Central Unit 1.4.13 Activation of Power Changeover Circuit Activate the RAM back-up battery by closing jumper S03 on the circuit board. BAT1 Figure 22. The RAM back-up battery. NOTE: The power changeover circuit contains a 3V lithium battery. At any interruption in the ordinary +5V supply, both the RAM and real-time clock will be supplied by the battery so that they retain their data. -
Page 21: Installation Test Procedure
IC08 is installed. Units with S942C Software Energize all the units in the system. Function indicator LED01 on T942C should light red for about 1 second and then change to a flashing orange. Function indicator Figure 23. -
Page 22: Circuit Board Replacement
If section 4 on SW02 is set to ON it must be switched to OFF. Set section 3 on SW02 to ON. Restart T942C by pressing push button S01. The parameter list will now be read from the non-volatile memory and any new parameter list can be loaded into the non-volatile memory from a PC equipped with PDM. -
Page 23: Central Unit T942C/2
Figure 25. Central Unit T942C/2 General The Central Unit T942C/2 is a simplified version of the T942C and is used in small Ascom Paging Systems. It controls all communications on the system bus and data buses. It also generates code to all H/U952T Terminal Transmitters. All inputs and outputs have transient protection, and all connections are equipped with chokes for increased EMC protection. -
Page 24: Board Description
Installation Guide TD 91684GB T942C and T942C/2 Central Unit Board Description LEDO1 IC13 ICO1 ICO8 IC22 IC50 IC54 IC23 IC56 IC57 Figure 26. Circuit board T942C/2. 16 April 2015 / Ver. G... -
Page 25: Installation
Installation Guide TD 91684GB T942C and T942C/2 Central Unit Connectors J01, J02 Modular jacks for connection of system bus cabling. Supply voltage. For connection of A or D-bus via twisted-pair wiring when modular bus cabling cannot be used. Used for diagnostic testing. -
Page 26: Connection Of Buses
Installation Guide TD 91684GB T942C and T942C/2 Central Unit 2.4.5 Connection of Buses Buses are connected either via modular bus cabling or twisted-pairs. NOTE: Data buses are polarized! Use only twisted-pairs for separate wiring! Bus Connections via Modular Bus Cabling... -
Page 27: Flash Proms Containing Software For The Main And Communication Processors
IC-socket IC54. Installation Test Procedure S942C software Energize all the units in the system. Function indicator LED01 on T942C/2 should light red for about 1 second and then change to a flashing orange light. Function indicator Figure 30. Central Unit T942C/2 At a start-up the Central Unit begins with a short self test for a few seconds. -
Page 28: Programming T942C Central Unit
Programming T942C Central Unit NOTE: This section is not applicable for the T942C/2 Central Unit. The programming of T942C shall only be performed by the system administrator which sets parameters and relevant functions in the Central Unit to customize its functionality. - Page 29 Installation Guide TD 91684GB T942C and T942C/2 Central Unit Select the Numbers tab Right-click the T942C Central Unit to be configure in the list. Select "Edit parameters". 3.2.1 Set License This chapters describes how to set the license on a Central Unit delivered with factory settings.
- Page 30 Installation Guide TD 91684GB T942C and T942C/2 Central Unit Document History For details in the latest version, see change bars in the document. Version Date Description 10 May 2012 29 November 2012 Added: 3 Programming T942C Central Unit on page 25 Updated: PDM added throughout in the document.
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