The M54617P is an integrated circuit for two-wire system LAN transceivers in compliance with J1850. It has a built-in function detecting bus-line abnormality, and allows ERR signal to turn to "L" in case of abnormality. In addition, the selector permits the output of normal bus signal. Turning the standby signal to "L" provides a low current dissipation status, when both BUS(+) and BUS(-) of the driver are turned OFF. Further, inputting "H" level to ERR pin when in the standby mode allows error output to be reset.