Abstract: Remote communication of substation hard node is one of the important information to monitor the operation status of substation. In order to ensure the correctness of the telecontrol telesignalling point table, it is very important to check the telesignalling in the maintenance or acceptance work, and the number of telesignalling point-to-point is very large. The conventional telesignalling point-to-point method uses a short lead, one end is connected to the telesignalling positive terminal, and the other end is connected to the target terminal, so the risk management and control in the process of point-to-point is particularly important. In the process of operation, once unsafe behaviors such as "accidental collision" occur, it will directly affect the power supply reliability of customers and the safe and stable operation of power grid. In order to ensure the safety, reliability, quickness and convenience of the remote signal checking process, this paper introduces the development process of a remote signal checking auxiliary device。