| 摘要 |
PURPOSE:To insert a reply character string without intermitting the operation of a data transmission circuit by designating a control data representing at the outside of a block check character arithmetic operation to a control informa tion area corresponding to a transmission buffer where a communication control program is divided into sections. CONSTITUTION:A data transmission circuit 3 sends transmission data in small buffers 131-13m to a line by the instruction of a 2nd control memory 2 and applies BCC (Block Check Character) generating operation after a specific character as a start character in the sent data. In this case, when the communi cation program 11 sets full duplex communication reply character to a specific small buffer, the control data designating to be a data at the outside of the object of BCC generating operation is set to control information areas 141-14m corresponding to the set small buffers 131-13m. Thus, while the circuit 3 sends the data of the specific small buffer, since the BCC generating operation is stopped, the possibility of production of intervention request to the communica tion control program is precluded and the communication efficiency is improved.
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