This is USB to RS422 (Dual) Adapter Board - manufactured by FTDI Chip. The manufacturer part number is USB-COM422-Plus2.

FTDI Chip USB to RS422 (Dual) Adapter Board -

Manufacturer:

FTDI Chip

Manufacturer Part No:

USB-COM422-Plus2

Enrgtech Part No:

ET20167778

Warranty:

Manufacturer

£ 48.23

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Kit Classification:

Adapter Board

Interface Function:

USB to RS422 (Dual)

USB-COM422-PLUS2 Datasheet(Technical Reference)

ESD Control Selection Guide V1(Technical Reference)