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[CCinPA]

...to control the same device? 


https://www.x10.com/tm751.html

[brobin]

From the description in the link you posted:

"Note:  Attempts to use more than one TM751 Transceiver on the same wiring may occasionally cause signal collisions which may "lock up" your transceiver. Though, most home systems run easily off a single transceiver. In the event of a lock up, simply unplug your transceiver and plug it back in. If you feel you need more than one transceiver, the RR501 Transceiver is the TM751's bigger brother. It is built with a filter system to filter out signals from other RR501 transceivers so lockout's and hangup's aren't a problem."

So the answer is yes with the above caveat but if you're buying now the RR501 is the better choice.

[Brian H]

The TM751A is impolite and can step on each other. As they have no power line receiver in them. So they don't know another one is sending an X10 message.

If they are in different parts of the home. So you can control the device from different locations in the house. They may or may not interfere with each other.

If they are on different House Codes. Each would only send messages it received on its House Code. Since they have no power line receiver in them. You can't send an X10 power line command to turn it on and off its internal switch.

The RR501 is polite and if it sees an X10 power line command it is supposed to wait until the command is complete.
It can also have its internal switch can be turned on and off by X10 RF or power line command. It can be set to Unit 1 or 9. TM751 is Unit 1 only.