Making read requests too fast

[Leo123]

Hi,

Setup (Baud rate 19.2k, Stop bit 2, 8-bit messages, no parity, RTU mode)

I am currently using the latest Libmodbus library. I experienced issues when I carry out multiple read requests at the same time. I.e.

pseudo-code:

while(true) {

if (condition true) break;

read 16 bit register;

read 16 bit register;

}

When I tested the program with a Modbus simulator everything seems to work fine, all read request returned the correct value. Therefore, I assumed that the library will handle the silence period automatically. However, when I tested the program with a physical Modbus device, I get errors when reading the register too fast. 

Therefore, my question is, do I need to handle the silence period myself? And if not, then what am I doing wrong when carrying out requests as shown in the pseudo-code above? 

Thank you in advance :)