Assessments - 2, GPA: 4
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Although various connection options are possible, typical applications are described in the sections that follow. Use whichever application is most suitable to your configuration. Typical configuration diagrams are included in this manual for reference. 5.4 PC RS-232 Interface Using a 9-Pin Connector In this application, the LTC 8786 is connected directly to the serial port of a PC. The user-supplied software installed on the PC must be designed to output "Receiver/driver and AutoDome RS-232 Control Code Protocol" data. This RS-232 data is converted into Allegiant biphase protocol using the LTC 8786 unit. The biphase data is then connected to the AutoDome cameras or Allegiant receiver/driver units as described herein. Attach an RS-232 standard null modem cable (part No. S1385) to the serial port of the PC. Connect the other end of the data cable to the 9-pin connector on the LTC 8786 converter unit. Skip to the section on AUTODOME CAMERA OR RECEIVER/DRIVER SITE CONFIGURATION to complete the installation. 5.5 RS-232 Interface Using RJ-11 Connector Connect one end of a suitable data cable to the RJ-11 jack on the LTC 8786 converter unit. The other end of the cable must now be interfaced to the RS-232 communication link. Only the RX and SIGNAL GROUND connections are required.The remaining pinouts should remain 'un-connected'. If the distance between the RS-232 communication link and the LTC 8786 converter unit is greater than 3 m (10), install an appropriate length of cable suitable for use with RS-232 signals (user-supplied). Since the data format is an RS-232 simplex transmission, only 2 signal wires (DATA and GROUND) will be required. If the distance between the LTC 8786 unit and the camera site is over 20-30 m (60-90 ft), the use of short haul modems (user-supplied) or other RS-232 line extender devices may be required. They must be able to support an RS-232 simplex transmission rate of 9600 baud. The wiring pinouts of the LTC 8786 series is shown in the PINOUTS section. 5.6 Remote RS-232 Device Interface In this application, Allegiant biphase control code is being converted into RS-232 which is then transmitted over an RS-232 communication link (fiber optics, microwave, dial-up phone modems, etc.). At the camera side end of the RS-232 transmission link, the RS-232 data is converted back into Allegiant biphase protocol via the LTC 8786 unit. The biphase data is then connected to AutoDome cameras or Allegiant receiver/driver units. The RS-232 communication link must be able to support an RS-232 simplex transmission rate of 9600 baud. © 2003 Bosch Security Systems Page 8 of 12 EN Operation 5.7 Data Output Connection The LTC 8786 Series provides sixteen biphase control code outputs. Connect a shielded twisted-pair cable (BELDEN 8760 or equivalent) from a biphase control code output of the converter unit to the camera site. Typically, a single camera site receiver/driver or AutoDome is connected, but the biphase output of the converter unit is rated to handle up to 8 devices when connected in a daisy chain configuration to a maximum of 1.5 km (5000 ft). For a daisy chain connection, the cable is looped through each AutoDome camera or receiver/driver along the way. Only the last unit in the daisy chain connection should be terminated. All other receiver/drivers should have their terminating resistor removed when the looping cable is connected. The removable terminal bl...
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