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# Electrical Design
### **!!NOTE!!**
The more mature version of a HAN Port reader is available under the folder [HAN_ESP_TSS721](HAN_ESP_TSS721). The main difference in these two versions are that this one is using a proprietary (but simpler) circuit for the M-bus to TTL
conversion and has very limited resources available for doing work on the schematics and PCB. The [HAN_ESP_TSS721](HAN_ESP_TSS721) is using a TSS721 circuit
The more mature version of a HAN Port reader is available under the folder [HAN_ESP_TSS721](../HAN_ESP_TSS721). The main difference in these two versions are that this one is using a proprietary (but simpler) circuit for the M-bus to TTL
conversion and has very limited resources available for doing work on the schematics and PCB. The [HAN_ESP_TSS721](../HAN_ESP_TSS721) is using a TSS721 circuit
from Texas Instruments, specifically designed for M-bus to TTL conversion. Also
all design is available for you in a [KiCad](https://www.kicad-pcb.org) format.