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PDM
PDM Operator's Manual Version 2.4a • September 2019
Serial / Parallel Remote control
In addition to IP based remote control, PDM supports traditional control systems for
maximum flexibility. All can be used simultaneously.
Parallel (GPIO or “Contact Closure”) Control
There 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 function
if you need isolated circuits. Inputs and outputs are opto-isolated, active low; wiring details
are on
page 65
.
Serial Control
PDM’s serial control options let you build custom interfaces, such as for an on-air or logging
systems. You can access PDM’s internal control language via RS-232 serial, a network Web
browser, 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 connections
Data and control lines appear on a male DB-25 connector in both RS-232 and RS-485
formats, 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-9
adapter 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 you
enable this function on the Configuration screen.
n
Once port 5443 is enabled, it remains accessible to the entire network until specifically
closed. There is no further password checking. Use a firewall, or keep your PDM on a
dedicated (closed) network, for protection.
Summary of Contents for PDM
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