25-Seven PDM Operator's Manual
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Contents
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| 55PDMPDM Operator's Manual Version 2.4a • September 2019Serial / Parallel Remote controlIn addition to IP based remote control, PDM supports traditional control systems formaximum flexibility. All can be used simultaneously.Parallel (GPIO or “Contact Closure”) ControlThere are eight inputs and eight outputs for remote control on a rear panel female DB-25 connector. Each can be assigned to PDM functions through a configuration screen,described on page 33. Multiple inputs or outputs can be assigned to the same functionif you need isolated circuits. Inputs and outputs are opto-isolated, active low; wiring detailsare on page 65.Serial ControlPDM’s serial control options let you build custom interfaces, such as for an on-air or loggingsystems. You can access PDM’s internal control language via RS-232 serial, a network Webbrowser, or both at the same time.The comprehensive language uses abbreviations to query delay depth and internal tem-perature, access all GPIO functions, and continuously report PDM’s operating status.Standard serial or IP-based connectionsData and control lines appear on a male DB-25 connector in both RS-232 and RS-485formats, as well as over a network.Enable RS-232 and set its protocols in the Web interface’s CONFIGURATION screen(page 44). You can wire a custom cable (page 67), or use a standard DB-25 to DB-9adapter and a null modem. You can use the RS-232 port either for control or to delay data.You can’t set it up for both functions simultaneously.Commands and queries can also be transmitted as IP packets over network port 5443, if youenable this function on the Configuration screen.n Once port 5443 is enabled, it remains accessible to the entire network until specificallyclosed. There is no further password checking. Use a firewall, or keep your PDM on adedicated (closed) network, for protection. |
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