usb ttl 5v rj12 serial cable
Length:6ft/1.8m
Signal Level: 5V TTL UART Serial Signals
Connector: USB to RJ12 Adapter Cable
New Geniune FTDI Chipset import from UK . Top Grade Quality .
Read the data from P1 Port Dutch Smart Meter Kaifa MA105 MA304
System Support: Win7/8/10/XP/Android/Mac/Linux/Vista ,32 & 64 BIT support .
Win7/8/10 free installation driver for geniune System
FTDI Driver Download:https://www.ftdichip.com/Drivers/VCP.htm
FTDI Installation Guide : http://www.ftdichip.com/Support/Documents/InstallGuides.htm
Package : 1 x FTDI USB TTL RJ12 6P6C Cable
The P1 port is a RJ11/RJ12 port, using the following pin out:
I grabbed an old modem cable, with RJ11/RJ12 plug and then I connected the appropriate pins to a modern devices USB-BUB. This device provides all the pins required. The request pin, as described above must be kept “HIGH” to retrieve data (i.e. provide 5V all the time). So I connected the request pin to the USb-BUB 5V. The other pins are DATA for the output, which I connected to the RX pin of the USB-BUB and GND which I obviously connected to the USB-BUB’s ground. This is a temporary solution until I get a proper 5V FTDI cable.
Note: to connect to the serial port, you need special port settings: 7 data bits (instead of the more regular 8) with even parity at 9600 baud.
Software
The P1 port uses a reversed serial protocol (1=0 and 0=1), to get this to work with a FTDI chip (this chip is used on the USB-BUB) you need to reverse the RX pin. Luckily FTDI provides a tool known as FT_PROG to do this. on the domoticaforum for figuring this one out. Here is a screenshot which shows you how to make the inverse RX setting in FT_PROG:
After programming you can also use the same cable under Linux, which is good because I run HouseAgent on Linux. Creating a plugin for HouseAgent was an easy task, it took me roughly 1.5 hours. For those of you interested in this plugin, you can find it’s source on Github.
And because of the built in graphing capabilities of HouseAgent (the screenshot is v0.2 btw :-) ), it was easy to create a graph of the current power usage (click for larger image):
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