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Release 1 

DAMS-NT DigiRIT Operation Manual 

12/14/2012 

Microcom Design, Inc. 

14 

 

Following  this  processing,  each  1024  byte  VCDU  frame,  complete  with  the  4-byte  frame  sync 
sequence, is forwarded to the  LRIT TCP/IP  Interface.  The additional processing of the VCDU 
required to extract DCS messages and other LRIT products is beyond the scope of this manual, 
but can be readily located on various NOAA websites. 

Note  that  while  the  DigiRIT  processes  the  LRIT  data,  it  also  continues  to  monitor  for  frame 
synchronization.   If  frame sync is ever lost, data  will discontinue to flow out the  LRIT TCP/IP 
interface.    Further,  it  should  be  emphasized  that  while  the  DigiRIT  Receiver  only  sends  DCS 
message  information  out  the  DAMS-NT  DCS  interface,  all  LRIT  VCDU  frames,  regardless  of 
the  associated  product,  are  sent  out  the  LRIT  interface.    This  also  includes  Fill  frames,  Fill 
frames  are  sent  on  Virtual  Channel  63  and  are  sent  whenever  the  LRIT  system  has  no  product 
information to transmit.   

1.3.4. 

Antenna Front End Power 

The DigiRIT can be configured to optionally provide DC Power at the Antenna In connectors to 
be utilized to power the satellite dish’s front-end.  The DC output is nominally 12 VDC and can 
safely source 0.75 Amps.  A series self-resetting 1.1 Amp polyfuse is included for protection in 
each Antenna In path.   

The DC power at the Antenna In connectors can be enabled and disabled as discussed in Sections 
3.1.4.  As shown in Figure 4, an LED is provided next to each Antenna In connector on the rear 
panel of the unit to alert the user when DC is present. 

NOTE:  When  using  a  DigiRIT  with  the  Antenna  Front  End  Power  option  enabled,  the 

Antenna In connection should not be connected to anything other than the satellite 
dish  front-end.    While  the  DC  Power  path  is  fused,  back  feeding  12  VDC  @  1A 
into many devices can damage them. 

  

 

1.3.5. 

DAMS-NT DigiRIT General Power Requirements 

The  Microcom  DAMS-NT  DigiRIT  Receiver  requires  an  AC  power  source,  but  can  accept  an 
input  voltage  range  of  100-240  VAC  at  either  50  or  60  Hz.    While  the  AC  Power  Input  and 
On/Off switch (see Section 2.2.2.5) also includes an integral 1 Amp Fuse, the maximum power 
required is less than 30 Watts.   

Содержание ucom DAMS-NT DigiRIT

Страница 1: ...DAMS NT DigiRIT Digital LRIT HRIT Receiver Operation Manual Release 1 Revision A 12 14 2012 Microcom Design Inc 10948 Beaver Dam Road Suite C Hunt Valley MD 21030...

Страница 2: ...tion and Hardware Overview 15 2 2 1 Front Panel Connections Controls and Indication 16 2 2 1 1 Front Panel Display 16 2 2 1 1 1 Startup Screens 16 2 2 1 1 2 Operational Status Screen 16 2 2 1 2 Front...

Страница 3: ...ure 4 DigiRIT Receiver Rear Panel 8 Figure 5 DigiRIT LRIT TCP IP Processing 13 Figure 6 DigiRIT Startup Screen Sequence 16 Figure 7 DigiRIT Status Screen 17 Figure 8 Accessing the Pushbutton Setup Mod...

Страница 4: ...tion Manual 12 14 2012 iii List of Tables Table 1 55 Character DCP Message Header Format 10 Table 2 Error Message Flag Values 11 Table 3 DRGS Source Code to Slot Number 33 List of Appendices APPENDIX...

Страница 5: ...tion This Operation Manual is divided into the following sections Section 1 provides introductory background and theory of operation information Section 2 provides hardware installation and hardware o...

Страница 6: ...re reserved internationally for exclusive use in this service To maintain GOES DCS channelization and frequency stability and to provide an amplitude reference NOAA NESDIS uplinks two Pilot or beacon...

Страница 7: ...l before it is sent to the DigiRIT Receiver The DigiRIT Receiver can accept a wide range of IF frequencies so it is compatible with numerous front ends Front ends typically require a DC supply to oper...

Страница 8: ...own DAMS NT Client software use of the DAMS NT interface socket means the DigiRIT Receiver is compatible with other DAMS NT Client applications As such the computer server and host application can be...

Страница 9: ...ately 14 5 All primary connections are provided on the rear panel while various test connections and controls are provided on the front panel Figure 3 shows the front panel of the DigiRIT while Figure...

Страница 10: ...sage Interface is a one way stream of DCS messages After a client establishes a connection the DigiRIT immediately begins to send DCS messages as they become available i e the DAMS NT Client does not...

Страница 11: ...resenting up to 8 bit error or message flags See Table 2 34 OrigAddress 8 Hex Characters DCP Address See Below 42 DcpAddress 8 Hex Characters DCP Address See Below 50 Length 5 Digits Zero Filled Numbe...

Страница 12: ...IT message data These legacy fields have been around for some time and should be well known and understood by most DCS users The ErrorFlags field in the message header contains two hex digits of messa...

Страница 13: ...tification Standards Please contact NOAA for the latest information on parity checking and character replacement in the LRIT DCS re broadcast Again the DigiRIT Receiver does not perform and parity che...

Страница 14: ...nded for custom developers this interface is provided via a separate network connector with a different IP address With a few notable exceptions this interface is essentially the raw LRIT transmission...

Страница 15: ...enna Front End Power The DigiRIT can be configured to optionally provide DC Power at the Antenna In connectors to be utilized to power the satellite dish s front end The DC output is nominally 12 VDC...

Страница 16: ...ilize the magnetic direction not the true direction Alternately the DishPointer website and applications provide a line of site indication overlaid on a satellite map which allows accurate azimuth ali...

Страница 17: ...mation is automatically saved to non volatile memory and recalled whenever the Receiver is powered up i e the unit should always come up in the same operational state as it was in prior to shutdown or...

Страница 18: ...ignal level In the example of Figure 7 the reported signal level is 46 1 dBm and the attenuation is set to 10 dB this means that the demodulator signal level is 56 1 dBm which is in the nominal range...

Страница 19: ...he DigiRIT receiver for operation Please refer to Section 3 1 for details on the use of these buttons 2 2 1 4 Test Port The front panel Test Port is designed to be utilized with an ASCII terminal appl...

Страница 20: ...rcuitry should be between 90 to 50 dBm As such if the nominal input signal is above 50 dBm then input attenuation see 3 1 3 should be used to reduce signal strength presented to the demodulator 2 2 2...

Страница 21: ...ormation Transmission but future GOES Satellites are expected to utilize HRIT High Rate Information Transmission The LRIT TCP IP utilizes a standard RJ 45 Ethernet connector The communication protocol...

Страница 22: ...Release 1 DAMS NT DigiRIT Operation Manual 12 14 2012 Microcom Design Inc 21 2 2 2 8 Cooling Fan Located on the Rear Panel is small cooling fan Do not obstruct the air flow around the cooling fan...

Страница 23: ...significant latency issues Even the highest priority messages which are currently coming from a single DCP being used to test the latency issue by NOAA NOS are affected NOAA is currently working to r...

Страница 24: ...operation To prevent the DigiRIT from being left in the Setup mode a 15 second inactivity timer is automatically started once the unit enters Setup Pressing either the SETUP or the SELECT button will...

Страница 25: ...e highest value is 9 and the lowest value is 0 SELECT IF FREQUENCY SELECT IF FREQUENCY SELECT IF FREQUENCY SELECT IF FREQUENCY 137 137 137 137 500 500 500 500 MHz MHz MHz MHz SELECT IF FREQUENCY SELEC...

Страница 26: ...ns 2 2 1 1 2 and 2 2 2 1 1 the DigiRIT Receiver will accept an input signal range of 90 to 20 dBm However the nominal signal presented to the demodulator circuitry should be between 90 to 50 dBm As su...

Страница 27: ...e VC validation process The following rules apply to the Virtual Channel settings A VC value of 63 corresponds to LRIT Fill packets and acts as an unused VC selection Except for the unused case VC ent...

Страница 28: ...UT LOOP TO INPUT LOOP TO INPUT LOOP TO INPUT Figure 15 Completing the Pushbutton Setup Sequence Pressing SELECT once will provide the second option SAVE AND EXIT Pressing SETUP at this point will dire...

Страница 29: ...op is active will call up the Test Port s Main Menu The DigiRIT Main Menu is shown in Figure 17 and consists of three options I System Info S System Setup Menu V Virtual Channel Setup Menu The System...

Страница 30: ...bvious distinction between the menu approach versus the pushbutton setup is that the current values for the related entries are all visible in the menu system As noted in Section 3 1 1 separate values...

Страница 31: ...tup menu the current values for the Virtual Channel Setup are displayed as part of the menu information and serves as a format guide when making changes As with the pushbutton setup this menu lets the...

Страница 32: ...transmitted messages the Baud rate is not truly applicable The DigiRIT can handle messages without the Baud specified in one of two ways First the DigiRIT can simply parrot this fact by reporting the...

Страница 33: ...eaches 999 it will rollover back to 000 While not recommended for operational use this mode can be useful for test purposes to verify all received messages are being reported and captured via the DAMS...

Страница 34: ...ach FL OW 081 USACE NWO Omaha NE 999 Unknown DRGS Source Code 3 3 Network Interface Configuration The DigiRIT Receiver provides two TCP IP network interfaces the DCS Message and LRIT sockets as discus...

Страница 35: ...ddress of the unit simply enter the new address in the corresponding edit box and click the Submit button Figure 22 Web Console Network Settings Before applying the changes the Web Console will displa...

Страница 36: ...ncorrectly altering some of these fields can adversely affect the operation of the DigiRIT Receiver Once the Port number field has been altered once again click the Submit button to lock it in but not...

Страница 37: ...application that can locate any and all Moxa modules on a network without having to know the configured IP Addresses of the modules a useful feature if the IP Address is incorrectly altered and or the...

Страница 38: ...ological Satellites DADDS DCS Administrative and Data Distribution System DAMS NT Data Acquisition and Monitoring System New Technology DAPS Data Collection System Automated Processing System dB Decib...

Страница 39: ...in Minimum MSB Most Significant Bit NESDIS National Environmental Satellite Data and Information Service NIC Network Interface Controller or Network Interface Card NIC MUX Network Interface Controller...

Страница 40: ...Inc 39 TCP Transfer Control Protocol U S United States UHF Ultra High Frequency 401 7 to 402 1 MHz for this DCS application UTC V Volts VC Virtual Channel Vpp Volts peak to peak WCDA Wallops Command a...

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