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Appendix B Serial Control Protocols A general description of DigiCart/E Serial Control Interface Protocols is included in this section. ES-Bus This section covers a general description of DigiCart/E ES-Bus interface protocol. The following Message Summary provides an outline of commands and responses that can be executed via the Serial Port. HOST DEVICE MESSAGE SUMMARY Add To Playlist Assign/Clear Preset Copy Create Playlist Display Message Erase Find cut - Index Find cut - Name Get Cart Status Get cut Notes Get Device Info Get Directory Info Get Preset Info Get Playlist Info Get Timer Info Loop Pause Play Play Preset Record Rename Reset Cart Select Set Cart Info Set cut Info Simulate button Simulate Knob Stop Cart Info Cart Status Cut Info (Find cut - Index) Cut Info (Find cut - Name) Cut Notes Device Info Directory Info Preset Info Stack Info Timer Info Complete protocol documentation is available to qualified parties. Authorization as a DigiCart/E third party software developer may be discussed by contacting the 360 Systems Customer Service department. HARDWARE FORMAT The serial connection is a 4-wire EIA-485 (RS-485) full-duplex channel. EIA-485 is a multi-drop version of the EIA-422 specification, and is fully compatible. DATA FORMAT The data format follows the ES-Bus specification in that the data transfer is asynchronous, 8 bits per byte, even parity, 1 start and 1 stop bit, for a total of 11 bits, 38.4K baud. In all cases, the message structure is fully compatible with ES-Bus. In general, all messages will be acknowledged by an ACK if successful or NAK if an error occurred. 70 • Serial Control Protocols