CDK-111A-Lite Owner's Guide - Ross Video

By means of “read” and “write” operations, the protocol allows the editor toconfigure and control the keyer. In general, read operations determine the currentstatus of keyer controls and write operations set controls and make selections on thekeyer.The editor serial interface is fixed at RS-485 transmission standard and operates at abaud rate of 19,200.Editor Transmission StandardThe CDK-111A-Lite is factory shipped with:• 19,200 baud, ODD parity, one stop bit, 8 data bits and• a select address of 30 (hexadecimal)The default select address of 30 assumes that the “Board ID” rotary switch at thecard edge is in position 0. Changing the select address is discussed in the section“Address Byte (Editor Select Address)” later in this Appendix.Editor Connector PinoutsThe CDK-111A-Lite provides an unbalanced full duplex RS-485 or 0-12V RS-232compatible interface.The signals on the rear of the RossGear chassis have been named from the point ofview of the CDK-111A-Lite. An editor serial interface will require the use of BNC 3and 4.GPI 1, Panel,Tally 1TX,GPI 3,Tally 3PGMOut 2Key AlphaInIN24681357BKGD 1InNotUsedRX, GPI 2,Tally 2PGMOut 1Key FillInCDK-111A-Lite ConnectorsThe CDK-111A-Lite uses a single-ended interface with the normally positive-goingsignals always set to ground. This is because the coax connector has only one signalpin and the surrounding shield is grounded as a standard feature of the chassis. Thiswill inherently limit the noise immunity of the connection and care must be takenwhen controlling the CDK-111A-Lite in noisy environments or over long cable runs.CDK-111A-Lite • Owner’s Guide v4B Appendix A. Serial Protocols • 4-3