The brochure for that transponder claims that it can accept serial altitude, which is what the EFIS-D100 outputs natively. However, it does not specify what data format it accepts. As described in the EFIS-D100 installation guide, there are 4 serial formats that the EFIS-D100 can speak. If the Becker unit can listen to one of them, then you would not need the encoder converter module. If the Becker is not compatible with any of those serial formats you would then need the encoder converter module.