3 – Connections : Other connectionsTASCAM DM-4800 User’s Manual 55Other connectionsMIDI connections (IN, OUT and THRU) Usethese standard MIDI connectors to connect the DM-4800 to other equipment. The THRU terminal alsofunctions as a MIDI Timecode output terminal.This MIDI functionality can be used to provide eitheropen or closed MMC loop control of remote devices.See “MIDI” on page 96 for details.NOTEThe USB connector provides MIDI to and from a hostcomputer for DAW control, etc. There is no need tomake a separate MIDI connection to and from such acomputer.RS-422 serial control terminal This 9-pin D-sub connector is used to provide control of suitably-equipped devices, using P2 protocol, etc. See“Remote operation” on page 105 for details.GPI terminal This 9-pin D-sub connector is usedto output signals on up to eight GPI ports, using acommon frame ground). See “GPI settings” onpage 45 for full details of how to set up and use thisport (in addition to the pinouts).TIME CODE This unbalanced RCA jack acceptslinear SMPTE/EBU timecode for synchronizationwith other devices. Note that the DM-4800 does notgenerate linear timecode, and can neither accept norgenerate vertical timecode.WORD SYNC (IN and OUT/THRU) In anydigital audio setup, it is important that there is one,and only one, word sync source.WARNINGMore than one such word sync source can cause seriousproblems, including possible damage to monitoringequipment.The DM-4800 can act as a word sync master or slave(set up in software—see “Clock setting” on page 56).The switch allows the OUT to act as a THRU whenthe DM-4800 is receiving word sync signals, as wellas enabling and disabling 75Ω termination on theinput.TO METER Use the cable provided with theoptional meter bridge (MU-1000) to connect themeter bridge to this connector of the DM-4800.FOOT SW Connect a standard momentary foot (orother) switch to this 1/4" jack. It can either be push-to-make or push-to-break, as the polarity can bechanged in software.For details of how to do this, as well as how to set upthe footswitch, see “SWITCH utility” on page 45.USB This is used to connect the DM-4800 to a hostcomputer for bi-directional control. This is, the com-puter can control the DM-4800—see the documenta-tion supplied with the TASCAM TM Companionutility software—and the DM-4800 can be set up as aDAW controller, controlling the DAW software run-ning on the host computer.We strongly suggest that you use only the USB cablesupplied with the DM-4800 to make the USB con-nection, and that this connection and disconnectionare made with the DAW software, or any other soft-ware communicating with the DM-4800, notrunning.Note that no drivers are necessary when using theDM-4800 with OS X or Windows XP.Power input As always, check to make sure thatthe voltage requirements marked on the unit matchyour power supply. Use a properly grounded powersupply, and connect the DM-4800 to it using a powercord which provides grounding facilities (such as theone provided with the DM-4800).