ReadCoils not working

[pruwait]

Test ModbusMaster.h and Slave simulation on PC

//read 5 coils from 1 to 6. Coils is 10101, in HEX is 15 result = node.readCoils(0x0001,5); //I see in Slave LOG right ADU 01 01 01 05 ..... for RX //I see in Slave LOG right ADU 01 01 01 (here coils in HEX) CRC for TX

if (result == node.ku8MBSuccess) { for (int j = 0; j < 10; j++) Serial.print(node.getResponseBuffer(j)); } But I see in screen 0 0 0 0 0 0 0 0 0 0

What is my mistake?

[bilabo438]

Hello, i have the same problem. if i read Holding Registers like this: node.readHoldingRegisters(0,40); it works fine. If i read Coils like this: node.readCoils(0,40); i only get ceros. I have checked the Coils with a modbus programm and i should receive a 1 at adress 9.

Is there any difference for getResponseBuffer() when i use readCoils?

Thanks in advance

[Rudy089]

Hi....plese check this link: https://github.com/4-20ma/ModbusMaster/issues/160#issuecomment-1100856532