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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 Groups

1

, which are clearly defined 

by function.  
Congratulations on purchasing your Kramer TOOLS

 Cobra T2

 Video / RS-232 

Transmitter

, which extends VGA and serial signals over ordinary Category 5 

cable. This unit is field configurable for various video and serial options (see 

Appendix D for configuration settings). 
The

 T2

 series feature video and RS-232 signals on a single CAT 5 cable. 

The package includes the 

Cobra T2

 Video / RS-232 Transmitter

 and this user 

manual

2

The Kramer 

Cobra

 series products are not compatible with Kramer non-

Cobra

 

series products. 

2  Getting Started 

We recommend that you: 

 

Unpack the equipment carefully and save the original box and packaging 

materials for possible future shipment 

 

Review the contents of this user manual 

 

Use Kramer high performance high resolution cables

3

. You may 

also need 1/8” (3.5mm) audio cable, video cable with HD15 connectors, 

serial cable with DB9 connectors, and CAT 5 cable. 

 

 

 

 

 

                                                       

 

1 GROUP 1: Distribution Amplifiers; GROUP 2: Video and Audio Switchers, Matrix Switchers and Controllers; GROUP 3: 
Video,  Audio,  VGA/XGA  Processors;  GROUP  4:  Interfaces  and  Sync  Processors;  GROUP  5:  Twisted  Pair  Interfaces; 
GROUP 6: Accessories and Rack Adapters; GROUP 7: Scan Converters and Scalers; and GROUP 8: Cables and Connectors 
2 Download up-to-date Kramer user manuals from the Internet at this URL: http://www.kramerelectronics.com 
3 The complete list of Kramer cables is on our Web site at http://www.kramerelectronics.com 

Summary of Contents for Cobra T2

Page 1: ...Kramer Electronics Ltd USER MANUAL Model Cobra T2 Video RS 232 Transmitter...

Page 2: ...Setting Sync Signal Output Termination 9 Figure 3 DC Restore AC Coupling Options 10 Figure 4 Cobra T2 Jumper Locations and Settings 11 Figure 5 Receiver Mounting Bracket 15 Figure 6 Mounting Bracket...

Page 3: ...ransmitter and this user manual2 The Kramer Cobra series products are not compatible with Kramer non Cobra series products 2 Getting Started We recommend that you Unpack the equipment carefully and sa...

Page 4: ...terminated on site or in an existing infrastructure should be tested before use to ensure compliance with the TIA EIA T568B specification Using incorrectly terminated CAT 5 cables can damage this pro...

Page 5: ...see Appendix A 4 1 Making the Connections This section contains figures showing connections with the specific Cobra Series models In general however the connection and setup procedure at both transmi...

Page 6: ...nections on the Single Port VGA RS 232 The Single Port Cobra T2 CAT 5 Video System with RS 232 supports video and full modem serial RS 232 signals over CAT 5 cable You can also use the transmitters an...

Page 7: ...h 75 ohm termination as the default To disable termination see Appendix B Problem Poor video quality Solution Have all receiver adjustments been finished Ensure EQ adjustment is set correctly turn kno...

Page 8: ...m devices must be the simplex serial type For assistance contact Technical Support See Appendix E for Serial board settings External switch for last unit in daisy chain Problem Green shift or green wa...

Page 9: ...Green Green Green C Y Y 8 Blue Blue Blue U 9 10 Gnd Gnd 11 Gnd Gnd 12 13 H Sync C Sync 14 V Sync 15 Gnd Gnd Table 2 Terminal Block PINOUT PIN Audio S2 Audio Simplex Serial S PDIF Audio Composite Vide...

Page 10: ...Solutions to Common Problems 8 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...

Page 11: ...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 Conver...

Page 12: ...nels in the Cobra The CobraT2 transmitter has been designed with full DC restore capability A simple switch setting is all that is required The following diagrams show the switch location and settings...

Page 13: ...e 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 follo...

Page 14: ...talled 1 Off 2 Off 3 Off 4 Off 1 Off 2 Off 3 Off 4 Off 1 Off 2 Off 3 Off 4 Off 1 ON 2 ON 3 ON 4 Off Composite S Video Component Video With Left Right Line Level Audio 1 Off 2 ON 3 Off 4 Off 1 ON 2 ON...

Page 15: ...e 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 s...

Page 16: ...3 4 OUT 5 6 OUT 7 8 OUT 9 10 IN 2 Full Duplex 2 way Short 500 ft 19 2K 1 2 See Notes 3 4 See Notes 5 6 OUT 7 8 OUT 9 10 OUT 1 2 IN 3 4 OUT 5 6 OUT 7 8 IN 9 10 OUT 3 Full Duplex 2 way Long to 1000 ft 1...

Page 17: ...holds four units in a 19 x 1U rack Not shown are brackets for 8 units and brackets for series receivers and transmitters The 8 Unit Rackmount Bracket holds the mounted units like the 4 Unit Rackmount...

Page 18: ...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...

Page 19: ...IMPEDANCE Video IN 75 ohms SERIAL CHARACTERISTICS Protocol Asynchronous transparent to data format transparent to data rates up to 19 2 kbps full duplex data rates to 115 kbps simplex half duplex mod...

Page 20: ...KRAMER SIMPLE CREATIVE TECHNOLOGY 18...

Page 21: ...or 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 commen...

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