This article reports the home-made electronics circuits for capture the various electronics signals and control functions on KEKB SRF modules which are used for site acceptance test of superconducting cavity. The adjustment of parameters during 1 SRF high power acceptance can also be used for the update of the 2 electronics. The modular electronics system will provide the advantages of fast repair, preparing spare parts easily, short installation time and flexible adjustment. The hardware of the whole electronics system is mainly designed by CPLD, PLC and Display meters. The Military Standard connectors are used for signals connection. There are always junction boxes for signal transmission test and convenient signal jumping for ensuring the correct signal source. In safety interlock, there are Fast Interlock Sum (0-10us) and slow ready chain (50ms-150ms). The complete system realizes the real time monitor and protection of the new superconducting resonant cavity.