# Irregular tx data receipt **URL:** \ **Category:** emonTx\ **Tags:** emoncms\ **Created:** [20 January 2021 19:54 UTC](https://community.openenergymonitor.org/t/irregular-tx-data-receipt/16601 "2021-01-20T19:54:55Z")\ **Posts on this page:** 1\ **Showing post:** 11
**Author:** ![borpin](https://community.openenergymonitor.org/user_avatar/community.openenergymonitor.org/borpin/32/193_2.png) [@borpin](https://community.openenergymonitor.org/u/borpin)\ **Post date:** [22 January 2021 18:47 UTC](https://community.openenergymonitor.org/t/irregular-tx-data-receipt/16601/11 "2021-01-22T18:47:22Z")
> [@gadgetbazza](#): > > Is there a guide for doing this with multiple emonTX units being connected via serial to a single Pi? Not a formal one but a few here. With 3, I’d be inclined to get a TTL to USB converter and plug them into the USB port of the Pi. > [@Emonpi - multiple serial-usb](https://community.openenergymonitor.org/t/emonpi-multiple-serial-usb/5327): > > Can i get 2 (or more) inputs via a serial-usb connected to the emonPi? Now i have one connected via the [RFM2Pi] in [intercaces] by changing the comport and baudrate. I would like to connect 2nd arduino via serial. > [@EmonTX dropouts](https://community.openenergymonitor.org/t/emontx-dropouts/16028/23): > > Hi Paul Thanks for the cable suggestion. Thought I would document here (for when I inevitably break something and want to refer back…) what I did to “wire” my two emonTx’s to the emonPi: Get two of the cables you linked above, 2x male-female USB extenders, and connect straight to the UART ports of the emonTx’s and USB ports of the emonPi Check they show up: pi@emonpi:~ $ lsusb Bus 001 Device 005: ID 0403:6001 Future Technology Devices International, Ltd FT232 Serial (UART) IC Bus 001 D… > **[FTDI Serial TTL-232 USB Cable](https://thepihut.com/products/ftdi-serial-ttl-232-usb-cable)** > > Just about all electronics use TTL serial for debugging, bootloading, programming, serial output, etc. But it's rare for a computer to have a serial port anymore. This is a USB to TTL serial cable, with a FTDI FT232RL usb/serial chip embedded in the... --- _[View the full topic](https://community.openenergymonitor.org/t/irregular-tx-data-receipt/16601)._