JPS5833592B

PURPOSE:To make data transmission accurate and transmit data surely by transmitting specific code data other than data to a controller in case of transmission miss in the unit which controls remotely electronic cash register ECR. CONSTITUTION:In the controller which controls remotely electronic cash register ECR, memory 34 which stores registering data or setting data transmitted from controller 10 and receiving and transmitting buffer registers 33R and 33T which stores temporarily transmission data from controller 10 are provided in ECR30. Meanwhile, arithmetic control part 11 which collects setting data set and registered in memory 34 of ERC30, memory 12 which stores registering data, and ROM 13 which sets a program previously are provided in controller 10, and further, buffer registers 14T and 14R which store temporarily transmission and receiving data, coincidence circuit 16 which decides the interrupt from ERC30 and miss data, miss data discrimination circuit 17, and data interrupt decision circuit 18 which decides that ECR30 has taken in data are provided.