The old systems using personal computers (Kanao and Kaminuma, 1994; Kaminuma et al., 1997) to record the three different outputs of STS-1 are finally stopped recording at the end of 1997. Two sets of thermal pen-recorders for HES and BRB output of STS-1, however, have now been operated for monitoring at ESL. Boom-POSition (POS) output of STS-1, which is proportional to the offset of the null position of the pendulum, is also kept to be analog-monitored with parallel input of a temperature in the sensor room.

The new acquisition system (DP/UX software) have some advantages comparing to the old one. A three-component analogue output by HES is digitized at 200 Hz over sampling by a 24-bit analog-to-digital (A/D) converter, generating a triggered signals of 80 and 1 Hz re-sampling data and the continuous outputs of 20 Hz data, respectively. A three-component broadband signals of STS-1 are also digitized to create the triggered output of 80 Hz re-sampling data and the continuous outputs of 20, 1, 0.1 and 0.01 Hz data, respectively. All the data kind by DP/UX software is as follows.

[ *.D/; data files, *.E/; event files]

AFP.D/	DC power supply	LHZ.D/
AFP.E/		LHZ.E/
BHE.D/		LLE.D/
BHN.D/	STS-VBB 20Hz continuous	LLN.D/	HES-LLP 1Hz trigger
BHZ.D/		LLZ.D/
BHZ.E/		LLZ.E/
BLE.D/		LOG.L/	logging data
BLN.D/	HES-LVBB 20Hz continuous	UCI.D/
BLZ.D/
BLZ.E/		UHE.D/
		UHN.D/	STS-ULP 0.01Hz continuous
HHE.D/		UHZ.D/
HHN.D/	STS-VSP 80Hz trigger
HHZ.D/		UME.D/
HHZ.E/		UMN.D/	mass position
		UMZ.D/
HLE.D/
HLN.D/	HES-LG 80Hz trigger	UTI.D/	interior temperature 0.01Hz continuous
HLZ.D/
HLZ.E/		VHE.D/
		VHN.D/	STS-VLP 0.1 Hz continuous
LHE.D/		VHZ.D/
LHN.D/	STS-LP 1Hz continuous	VHZ.E/

The form of all data is a 'Mini_SEED volume', which is a standard format for data exchange in the global seismology. The digitized data are automatically transmitted from A/D converter to the aquisition server Solaris workstation via TCP/IP protocol. All the kind of data are stored in a 40 GB hard-disk of the server, then copied into DAT or 8 mm tape in everyday by batch command. A recording condition of A/D converter has been continuously monitored by a personal computer via RS-232C serial port / or by Unix remote command from the server workstation.

A remote mass-centering of the STS-1 sensors can also be carried out by a keyboard command from the computer / workstation. A reference clock for the new system has also been calibrated to the Coordinated Universal Time (UTC) from a Global Positioning System (GPS).

Transmission of the digital waveform data obtained by a broadband seismographs from Syowa Station (SYO) to the National Institute of Polar Research (NIPR) has been successfully made since 1993 via the INMARSAT telecommunication system. The UUCP protocol has been used for the file transfer. In addition, e-mail communication started from May 1995, and phase read-out data can be sent directly to the National Earthquake Information Center (NEIC) of United States Geological Survey (USGS) regularly with time delay of a week.

From the spring of 2004, INTERSAT telecommunication link have been working between SYO and NIPR. Then the aquicited digital waveform data have been sent to NIPR continuously every day by using the UUCP protocol. Moreover, it becomes easily to make a remote control dirrectly to the A/D converter and acquisiting Solaris server at SYO from NIPR office.