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The Modbus.dll will no longer be updated, and it is removed from FTP and CD.
If you need Modbus library, it's recommended to use the nModbusCE.dll.

Comparison of nModbusCE.dll and Modbus.dll
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nModbusCE.dll (Recommended) Modbus.dll
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Development tools .net CF .net CF / EVC

Modbus/TCP Master, Slave Master Only

Modbus/RTU Master, Slave Master Only

Modbus/ASCII Master, Slave Master Only
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The location of nModbus SDK libary is on
Path = CD:\napdos\wp-5231\SDK\nModbus
FTP = ftp://ftp.icpdas.com/pub/cd/winpac/napdos/wp-5231/sdk/nModbus

The location of nModbus demos are on
Path = CD:\napdos\wp-5231\Demo\nModbu
FTP = ftp://ftp.icpdas.com/pub/cd/winpac/napdos/wp-5231/Demo/nModbus

The location of nModbus reference document is on
Path = CD:\napdos\wp-5231\SDK\nModbus
FTP = ftp://ftp.icpdas.com/pub/cd/winpac/napdos/wp-5231/sdk/nModbus

If you still need Modbus.dll, please send email to us for assistance.