Kramer Electronics, Ltd.
Contents Contents 1 2 3 4 4.1 4.
Introduction 1 Introduction Welcome to Kramer Electronics (since 1981): a world of unique, creative and affordable solutions to the infinite range of problems that confront the video, audio and presentation professional on a daily basis. In recent years, we have redesigned and upgraded most of our line, making the best even better! Our 500-plus different models now appear in 8 Groups1, which are clearly defined by function.
Overview 3 Overview Our Kramer Cobra series products are compatible with CAT 5/5e/6 data cabling as well as skew free CAT 5/5e cabling manufactured for video applications. Note that some skew free CAT 5 is specific to a particular vendor and is not compatible with our products. Ensure any skew free CAT 5 cable is non-proprietary prior to purchase / installation.
Setup and Installation 4 Setup and Installation Data Mode Configuration The Kramer Cobra T2 Video / RS-232 Transmitters are configured in full modem bidirectional serial modes. If you are using the daisy chain receivers or a CAT 5 matrix switch or CAT 5 distribution amp, this mode must be changed to uni-directional broadcast. To do this, configure the internal Serial Daughterboard (SDB) to change the transmitters and receivers serial mode operation (see Appendix E).
Setup and Installation At the receiver end (refer to the receiver user manual): 1. Connect the VIDEO OUTPUT HD15 connector to the display unit, and attach any audio (AUX I/O) and/or serial connections (RS-232) depending on the model of the Cobra CAT 5 Video System. 2. Connect the CAT 5 cable to the LINK INPUT connection. If daisy chaining units, connect the output CAT 5 cable to the LINK OUTPUT connection. 3. Apply power.
Solutions to Common Problems 5 Solutions to Common Problems In most cases, nearly every issue with the Cobra T2 CAT 5 Video System can be resolved by checking the CAT 5 termination and making sure that it’s pinned to the TIA/EIA 568B wiring specification. However, there may be other problems that cause the system to not perform as it is designed. Below are solutions to the most common installation errors. Problem: No video signal at the transmitter local port or at the receiver.
Solutions to Common Problems Problem: Solution: Problem: Solution: 6 Serial communication doesn’t work correctly. Are the serial devices connected properly? Are the serial parameters correct for source/destination devices? Are the serial cables terminated correctly? If a null-modem cable is used, it must be placed at the receiver end. When using RS-232 transmitters or receivers in daisy chains, CAT 5 switches, or CAT 5 distribution amps, the serial signal is a unidirectionally broadcast mode only.
Solutions to Common Problems Appendix A Cabling Pinouts Table 1: HD15 Video Connector PINOUT Pin RGBHV (VGA) RGBS RGsB 1 Red + Red + Red + 2 Green+ Green+ Green+ 3 Blue+ Blue+ Blue+ 4 — — — 5 Gnd Gnd Gnd 6 Red- Red- Red- 7 Green- Green- Green- 8 Blue- Blue- Blue- 9 — — — 10 Gnd Gnd — 11 Gnd Gnd — 12 — — — 13 H Sync C Sync — 14 V Sync — — 15 Gnd Gnd — Composite SVHS (Y/C) C+ YUV C+ V+ Y+ Y+ U+ C- C- V- Y- YU- Table 2: Terminal Bloc
Solutions to Common Problems Appendix A Cabling Pinouts Table 3: DB9 Female Serial connector Pin Full Duplex 3 wire (S2) Simplex 1 DCD 2 RX RX 3 TX TX TX 4 DTR 5 Ground Ground Ground 6 DSR 7 RTS 8 CTS 9 RI Table 4: T568B CAT 5 PINOUT 8 KRAMER: SIMPLE CREATIVE TECHNOLOGY
Solutions to Common Problems Appendix B Setting Sync Signal Output Termination In some cases, it may be necessary to disable the 75-ohm termination of the video outputs on the Cobra CAT 5 Video System units. This can be done by opening the case of each unit and installing jumpers on the circuit board. The settings disable/enable the 75-ohm termination on individual units. For instance, changing a transmitter termination affects the local monitor port only, it doesn’t affect the receivers.
Solutions to Common Problems Appendix C DC Restore to fix Green Shift of AC Coupled Signals The standard Cobra product is designed to function with DC coupled signals with the black level referenced to 0 volts. Nearly all VGA cards function this way. However, some media servers or digital camera devices provide AC coupled signals and can cause a green color shift in the video. This is a result of the sync clamping on the Red and Blue channels in the Cobra.
Solutions to Common Problems Appendix D Cobra T2 Configuration Settings Note: Cobra transmitters are typically pre-configured at time of order and will have factory configuration indicated in the part number label on the underside of the unit. The factory configuration may be changed or checked by using the following jumper location diagram as well as Table 5 for jumper settings.
Solutions to Common Problems Table 5: Cobra T2 Configuration Jumper Settings Configuration Option (all options utilize 4th pair, except special configurations): SW1 SW2 SW3 SW6 With Left/Right Line Level Audio 1 Off 2 ON 3 Off 4 Off 1 ON 2 ON 3 Off 4 Off 1 Off 2 Off 3 ON 4 ON 1 ON 2 ON 3 ON 4 Off With SDPIF Digital Audio 1 Off 2 Off 3 ON 4 Off 1 Off 2 Off 3 ON 4 Off 1 Off 2 Off 3 ON 4 ON 1 ON 2 ON 3 ON 4 Off With Simplex Serial (receive only) 1 ON 2 Off 3 Off 4 Off 1 Off 2 Off 3 Off 4 ON 1
Solutions to Common Problems Appendix E Serial Daughterboard (SDB) Settings The single-port serial transmitters and single-port and dual daisy chainable serial receivers contain an internal serial daughterboard (SDB) that can be configured for various serial modes. The SDB hardware configuration is done via jumper settings. These jumpers are used to set the various modes of operation. As shown below. Both ends must be set the same. To access the SDB on transmitters and receivers: 1.
Solutions to Common Problems Appendix E Serial Daughterboard (SDB) Settings, cont The single-port serial transmitters and single-port and dual daisy chainable serial receivers contain an internal serial daughterboard (SDB) that can be configured for various serial modes.
Solutions to Common Problems Appendix F Rackmounting Units The Rackmount Kits include brackets for mounting a single transmitter, single receiver, or a single dual daisychainable receiver. Figure 5 shows the 1-Unit Rackmount Bracket , which can be used to mount a single unit on a wall. Figure 6 shows the 4-Unit Rackmount Bracket, which holds four units in a 19" x 1U rack. Not shown are brackets for 8 units and brackets for series receivers and transmitters.
Solutions to Common Problems Appendix G Setting Sync Mode The Cobra T2 has the capability for fixed and agile sync. The default sync mode setting is for agile sync which replicates the source sync polarity signals. However some displays require a fixed sync polarity that is not possible to change at the video source. NOTE: Both transmitter and receiver must have the same settings. Not all Kramer Cobra T2 transmitter/receivers support this function. In this case Agile Sync Mode must be used.
Technical Specifications 6 Technical Specifications 1 Table 7: Technical Specifications of the Cobra T2 CABLE REQUIRED: COMPLIANCE: VIDEO SUPPORT: RESOLUTION AND REFRESH RATE: REQUIRED SOURCE IMPEDANCE: REQUIRED DESTINATION IMPEDANCE: SERIAL CHARACTERISTICS: CONNECTORS: TEMPERATURE TOLERANCE: HUMIDITY TOLERANCE: ENCLOSURE: POWER: SIZE: WEIGHT: Category 5, 5e, 6 shielded or unshielded twisted pair CE; FCC Class A, IC Class/class A VGA, SVGA, XGA, XGA-2, RGBHV, RGB, Composite, S-Video, Component Video mo
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For the latest information on our products and a list of Kramer distributors, visit our Web site: www.kramerelectronics.com, where updates to this user manual may be found. We welcome your questions, comments and feedback. Safety Warning: Disconnect the unit from the power supply before opening/servicing. Caution Kramer Electronics, Ltd. Web site: www.kramerelectronics.com E-mail: info@kramerel.
