... or TCP/IP. ST-680 LCD networking&standalone time attendance type series(ST-680,ST-680M): functioan ... standalone or networking,compact-size, time attendance can be availableNetworking with RS-232/RS- ... 485 or TCP/IP1,networking and standalone time attendance,compact-size time attendance, multiple functions.2,16X2 STN ... by the computer’s command. networking terminal time recording