H0300 Event Logger - Event logging - Event relaying (repeater) - On display memory log - Printer log (hard copy) - RS232 based configuration - RS485 bus communication The SELCO H300 Event Logger is a compact stand-alone unit capable of logging alarms and events from the M1000C Alarm Monitor, the M3000 Analogue Alarm Monitor, the M4780 and the H1500 Indicator Panels.