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SNMP Around the Station
The next thing to do was connect the MCS up to our LAN. When I did that, the FM10B made its appearance on our network.
Control of the FM10B could be done via a direct connection between a computer and the MCS (via Audemat's program called Master View) but that isn't what we do; all the normal user controls for the FM10B are viewed on the GUI of the WWPR Relio (or WLTW Relio). In fact, one entire tab in the GUI is dedicated to the FM10B. If you look at Figure 3 you'll see a column of buttons on the lefthand side that correspond to the BE controls: In the middle column there are two grey boxes for status (they turn green when ON) and in the righthand column, the typical transmitter meters. These controls (except the bottom two) and the meters (except the bottom one) are carried out via SNMP -- no extra wiring involved. The pushbutton controls are done via SNMP Set and the metering is done via SNMP Get (with continual querying).
A script for changing transmitters exists on Relio; controls for that function are actually done via real wire. (Those are the bottom two buttons, and the bottom meter.) The scripting is done with Audemat's program called ScriptEasy. Once you decide that you are going to use SNMP, you'll load the particular MIB you need in to the mini-control-silver; afterward you can use its own MIB browser to pick out what you want it to read. SNMP-accessible objects are then available to use in the script, in addition to the eight relays, eight status inputs, and eight meter inputs.
Another very well known remote control that takes advantage of SNMP is the Burk Arc Plus. Burk has a custom interface for the NV series of transmitters. Bill Eisenhamer of KIFM in San Diego (Lincoln Financial Media) was kind enough to send me a description of how the system works in practice.
The PlusConnect-NV talks to the transmitters via the local LAN, and continually queries the AUI of the transmitters. The information gathered feeds to the ARCPlus for display, command and status. (AutoPilot gets information that it needs from the ArcPlus.) The user configuration is done using drop-down menus to map pre-defined channels to ArcPlus using AutoPilot Plus (Figure 4).
The PlusConnect-NV is configured via telnet; this includes its IP address, port numbers and polling rate (Figure 5).
- continued on page 5
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