ETS SM8-RC Instructions

SM8-RC RS232 Controllable Microphone Mixer / Switcher Instructions
The SM8-RC is a RS232 controllable microphone mixer and switcher for use ETS pre-amplified microphones
only. The SM8-RC is primarily designed to be used in conjunction with DVRs / video gateways in one way
(or two-way: using the companion SS8-RC speaker switcher) to expand versatility in audio zone handling. Note-
the DVR manufacturer must write custom software to "talk" to the –RC series switchers via an available RS232
port on the DVR using a simple ASCII protocol described later in this document.
Note-If your application requires more than 8 audio zones, you must add (loop or cascade) additional SM8-RCs for 8
more zones and up to a maximum of 32 zones total (4 SM8-RCs). Each SM8-RC is assigned an ID number for its range
of zones as described later in this document.
Front panel controls and indicators
When powered up, the SM8-RC is in remote control mode (the front switches do not work.)
If you want to control the switcher manually, press and hold the Zone 1 button until the "Recorder" indicator light goes out.
You can now select and deselect Zones by pressing their respective channel buttons. You can also set the volume of a
zone by adjusting the corresponding Level control.
To go back to RS-232 control mode, press and hold the Zone 1 until the "Recorder" light illuminates.
Setting the zone range ( ID ) for looped SM8-RCs
Unplug the SM8-RC from its AC power Source. Press and HOLD DOWN the corresponding zone number which
translates to ID channel number. CH1=ID1....CH4=ID4. Power up the SM8-RC until the corresponding channel light
illuminates. Then release the switch and the CH lamp will extinguish shortly thereafter.
ID 1= zones 1-8 ID 2= zones 9-16 ID 3= zones 17-24 ID 3= zones 25-32
Note-On a power down / up cycle of the SM8-RC, the ID of the unit will be shown on the corresponding zone lamp (1-4)
seconds.
for 2
Rear panel connections
PWR: The SS8-RC uses a 12Vdc 1amp transformer. Note- the SS8-RC and SM8-RC use different types of AC adapters.
Audio Out Connector: Connect this to the Audio input of your remote monitoring equipment.
Audio In Connector: When using multiple SM8-RCs, connect the Audio output of the first SM8-RC to the Audio input of the next
SM8-RC using the supplied RCA patch cable.
RS-232 Connectors: This is a looping RS-232 input and output. You only need one RS-232 port on your remote monitoring equipment
to control up to 4 SM8-RC and 4 SS8-RC devices. Plug the RS-232 DB9/3.5mm cable into either RS-232 jack on the SM8-RC. Connect
the other end of this cable to your remote monitoring equipment. If using more than 1 SM8-RC, Plug the supplied 3.5mm/3.5mm patch
cord into the remaining jack of the first SM8 and into the next SM8-RC (see connection diagram).
Microphone inputs Use a single pair shielded #22 wire for microphone cable runs up to 1500'. You can connect any SM1 series
microphone to the SM8-RC inputs.
ETS microphone speaker switcher command protocol version 2.0
Note- all selected channel settings are lost during a power outage of an SM8-RC. The –RC series switchers are
also, RS232, listen only devices and currently do not communicate back any information to the host controller.
Therefore, it is recommended that the host control software periodically update the switchers via RS232 with the
current settings as a precaution so as to not lose track of channel settings during a power loss.