Thank you both very much for your input,
As I previously mentioned I found the OE manufacturer of the device and their website, I found a wechat number and contacted them for support, a very helpful man named Peter from BonitaLabs replied me within minutes and shared some information with me that has got the device to read in continuous mode.
Here it is and hopefully this helps someone else in future.
To communicate via rs232 the commands are 'R' to request data, 'T' to Tare and 'Z' to Zero.