ICP DAS USA GW-7552-B User Manual page 53

 DA: Device Address-0x01
 FC: Function Code-0x02:read DI
 SA(Hi): Start Address(Hi byte)-0x00
 SA(Lo): Start Address(Lo byte)-0x00
 NO(Hi): No. Of points(Hi byte)-0x00
 NO(Lo): No. Of points (Lo byte)-0x10
 BC: Byte Count-0x02
GW-7552-B / GW-7552-M PROFIBUS/MODBUS GATEWAY User Manual (Version 1.60, May/2017) PAGE: 53