We make an adapter that converts the UH400 XLR input into a TA5M 5 pin equivalent for 2 or 3 wire lavaliere use. The model number is a MCA5X. You will need to set the UH400 for 5 Volt phantom power but it does have Zener protection if you forget and leave the UH400 on the 48 Volt setting. It's in this catalog: 

You can also do the following, but you MUST have the UH400 set for 5 Volts, not 18 Volts or 48 Volts:
For a 2 wire lavaliere, pin 1 of the XLR is ground and pin 2 is bias (audio). Pin 3 not used for a lavaliere. 

If you have a three wire mic like the Cos-11 it is a little more complicated but not bad. Hook shield to pin 1, a 2 k to 3 k resistor between pin 1 and the Cos-11 white wire (source load) and hook the remaining black wire to pin 2 of the XLR. This will give you a low distortion hookup comparable in gain to the UM series of transmitters. We strongly recommend putting a small 6.8 to 9 Volt Zener diode across pin 1 and pin 2 for voltage protection in case you misset the voltage. The cathode goes to pin 2 and the anode to pin 1.

The MCA5X is certainly an easier solution.