HMI Delta Modbus RTU Hex Address (Master)

Question

I'm using DOPSoft to create HMI Application Modbus Master RTU. When I'm using API link.read("{Modbus}5@RW-1") it work fines. But I want to my parameters is flexible for reading multiple slave device with other address, so I used:

local addrLinkMem = string.format("{Modbus}%d@RW-%d", 3, 100);
link.Read(addrLinkMem)

DOPSoft notifies error Program name: Main(10): "addrLinkMem" Element address input error

string.format() is return a string, so addrLinkMem is a string. What I have fault ? How can I use link.read() without address fixed parameter ?

Thanks very much everyone !!

-- Add initial code here (run once)

while true do
    -- Add loop code here (cyclic run)
    timeStamp = startTick 

    readVal1 = link.Read("{Modbus}5@RW-0") --It's work fine

    local addrLinkMem = string.format("{Modbus}%d@RW-%d", 3, 100);
    readVal2 = link.Read(addrLinkMem) --Program name: Main(10): "addrLinkMem" Element address input error

    -- one cycle is 250ms
    sys.Sleep(250)  

end
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