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

NotePush-button / Lamp Control Command (46/47, C6/C7)The read command is used by the editor to determine the status of a push-button andits associated lamp or LED. The keyer will, in turn, respond with the appropriateform of the write command, indicating either the “on” or “off” state of the specifiedpush-button / lamp (PB/L).The write command is used to turn the designated PB/L “on” or “off”. Use of aninvalid PB/L number within a write command will cause the keyer to ignore thecommand.Commands 46 and 47 are identical. If an invalid PB/L numberis specified in the read command, the reply will indicate anOFF status for a fictitious PB/L 00(H)Push-button / Lamp Control Command (46/47, C6/C7)Function Byte Count EffectsAddressREAD:CommandCodeMessageKeyer PB/L 03 01 46/47 PB/L numberWRITE:Keyer PB/L On 03 01 C6 PB/L numberKeyer PB/L Off 03 01 C7 PB/L numberThe Push-button / Lamp control command has limitations due the functionaldifferences inherent in two types of push buttons on control panels; mutuallyexclusive and alternate-action. Mutually exclusive push-buttons are interlocked sothat only one push-button in a group can be selected at a time; selecting one cancelsany others in the group. In such groups, the C6 (write on) command will turn off thecurrently lighted button when another button is selected, but there is no action takenif the C7 (write off) command is sent to turn off the currently lighted button. Keyerlogic requires that one button must always be selected.The alternate-action type of push-button changes state each time the button ispressed, turning off on the first time it is selected, off the second time, on again thethird, and so on. In the alternate-action groups, the Push-button / Lamp controlcommand must select the correct “next state” – on or off – of the push-button orthere will be no change to the status of the push-button.CDK-111A-Lite • Owner’s Guide v4B Appendix A. Serial Protocols • 4-15