I am working with the CP341 with the MODBUS-RTU (Master) protocol and with the SEND function I have the following error code "0F05" 

What is it code?

Hello,

sry, why you guys not post full info about SW you're using, version of driver, CP and some pictures of code? How we can help you if you don't provide needed infos?

I am working with MODBUS RTU MASTER, 9600, N, 2.

Hello,

look to document, page 79. There is system of STATUS, also link to description how you can check value.

Hello,

you can also look to CP341 manual, there is also good description with example how you can check STATUS value.

Update: due your STATUS value I don't see event number with that your mentioned event class. In other classes is mentioned 05h event. Try look again carefuly if you have really event class 0Fh with 05h event. Probably in my opinion it can be very close like not received message within defined timeout. Pls check that again.

But when i try to send to slave a have this error "0F05"

capture attached.

Hello,

ok, let start with basic investigation/checks, hope we something find that can be point of problem.

1. you need dongle inserted to CP341 in backside - Master RTU.

2. you can check driver version with looking to CP options. Maybe you've download some version and install it to PC, maybe better have highest version, also downloaded to CP.

3. I'm curious what you have on CP LADDR address on DB40.DBW16 for SEND, also DB41.DBW16 for RECV. Is this correct to your CP cfg address?

4. what you have defined on DB42 offset 0, show better structure with online data. This need to be set to SEND_RK - you have ok but don't see that data, also correct LEN parameter - I see 10, this is now not clear to me, therefore show online data inside this structure. Also what we know, this structure must be correctly set as basic first.

Update: I know that probably I ask basic questions, also maybe you have all done already correctly, but sry, sometimes little error shows...

Hello,

1. Yes I have inserted.

2. I have loaded the latest version.

3. In DB40.DBW16 and DB41.DBW16 i have in both 256 (Address of cp341).

4. DB42 offsett 0 is adress of slave (01)

Attached my program know that the parameters of my slave are:

9600, NO parity, 2 stoped bit, address 01, fonction 03 or 04, address data 008A, len data 4 bytes(2register). 

Hello,

don't still look to your zip file but, can you explain DB40.DBW10 - LEN, why that value 16#20? Now I have structure with complete 6 BYTEs - 1x BYTE - Slave address, 1x BYTE - FC code, 1x WORD - reg, 1x INT - reg count. Complete of 6 BYTEs structure, so this value I have set in LEN parameter, working ok. Also be kind give info why 2 stop bits are needed, also you don't need parity?