User manual ZENITH HCS2000R SETUP GUIDE

[. . . ] If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: · Reorient or relocate the receiving antenna. · Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. · Consult the dealer or an experienced radio/TV technician for help. CAUTION: Do not attempt to modify this product in any way without written authorization from Zenith Electronics Corporation. Unauthorized modification could void the user's authority to operate this product. 2-WIRE COMM-WARN © Copyright 2001 Zenith Electronics Corporation PRN System Setup Overview Use this overview for reference to set up an in-store communications interface system Back of Computer Host Computer Head-End Unit Signal Combiner Modulator Outputs Broadband Amplifier 1 2 3 4 5 6 Signal Combiner Passive Signal Splitter Hrdwe. [. . . ] 3) Each TV requires its own unique a switches off. ) See "How to Set Dip Switch . . . 4) Insert the TV modem card into the slot that originally contained the MPI card. Note: if it is too difficult to connect the RF cable to the TV modem card, the TV back may be removed to help facilitate the installation. Make sure that the TV modem card is properly seated in the SuperPort card slot. TV Interface Communications between the Head End unit and the TV are via the 75 ohm RF cable. ddress, Instructions Setupdefault is $00h To begin development of the PRN system software, the head end unit and the TV card must be set up. PAGE 4 3-WireRev6/00 System Overview Remove old MPI card Install HCS100T TV Modem Card 5) Connect the other end of the F-connector RF cable (from the HCS2000R unit, via the splitter) to the F-connector on the TV modem card. 6) Connect an RF signal source (cable, antenna, vcr, etc) to the F-connector on the TV modem card. idual TVs identification is 7) Plug the TV's power cord into 120VAC 60Hz. the dip switch set to "OFF" to assure the correct setting. Head End Computer to Microcontroller Interface Protocol ddress (MSB is master computer shall interface to the "head The "head end"always 1) end" RF modem's microcontroller via 1200 baud, 1/2 duplex, 8 ddress bit word, 1 stop bit, no parity serial port. The commands from the master computer to the modem shall consist of between 5 and 64 eight bit bytes total. The format shall be: Byte Range Description Master # 00-7F Head End RF Modem ID number (MSB is error flag) TVID1 80-FF Upper Nibble TV ID a TVID2 00-FF Lower Nibble TV ID a TV Command 00-FF Command type directed to the TV Number of Arguments 00-3A Number of argument bytes to follow - can be 0 to 58 Argument 1 00-FF First Argument Argument 2 00-FF Second Argument . Argument Last 00-FF Last argument Check Sum 00-FF Modulo 256 check sum of all bytes in command Responses from the microcontroller back to the "head end" computer are of the same format with two exceptions: first, the most significant bit of the Master # byte is set to a `1' by the Protocol The computer commands the TV by sending a packet of identification information, command type, arguments data, and checksum to the HCCS2000R. If successful, the HCS2000R responds back to the computer with a status message consisting of identification information, command type, data, and checksum. If not successful, an error message is returned. Identification At this time, the do not have the capability to contain and use a unique electronic identifier, so indiv achieved via the dip switches contained on the TV modem card. For test purposes, these switches are set to OFF, indicating "TV #FFFF". Setting these switches to any other value means that any message generated by the host computer must have the TV identification selected as part of the message packet, otherwise a no response error will occur. Similarly, the HCS200R unit has the capability of being uniquely identified. Normally, this feature will not be required, so leave the switches set to all "ON, identifying the head end as 00. This is done in hardware, so the MSB dip switch setting will not have any effect. The sample card does NOT yet have this in hardware, so please leave 206-3594 PAGE 5 System Overview microcontroller if there was an error resulting from the previous command; second, in an error response, the number of arguments is forced to be one, which is the error type code. The "TV Command" byte returned by the microcontroller is forced to be the "Error Code" response. This is a code that cannot be sent by the "head end" computer, rather, it is a microcontroller to computer message value only. The "head end" computer must wait for a response from the microcontroller before sending a subsequent command string. There is no "stack" of commands from the "head end" computer, so the microcontroller shall ignore any command strings received before the initial string behaviors have been completed. [. . . ] Read your Operating Guide carefully so that you will understand the operation of the TV and how to adjust the controls. Reception problems caused by inadequate antenna or faulty antenna connections are the owner's responsibility. Product Registration--Please fill out and mail the Product Registration Card. It is imperative that Zenith know how to reach you promptly if we should discover a safety problem that could affect you. [. . . ]