GPS 02 » History » Version 4
laforge, 07/06/2020 12:15 PM
| 1 | 2 | laforge | h1. GPS 02 01 |
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| 2 | 1 | laforge | |
| 3 | This is the Ericsson original GPS receiver that can be used to provide a clock reference to equipment like [[DUG 20]] or [[DUL 20]] or also the [[SIU 02]] |
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| 4 | 2 | laforge | |
| 5 | It is also called "NCD 901 41/1" |
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| 6 | 3 | laforge | |
| 7 | h2. Connections |
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| 8 | |||
| 9 | h3. RJ45 for connection to DUL/DUG/DUW/SIU/TCU |
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| 10 | |||
| 11 | The unit has two RJ45 sockets. They appear to have identical functionality. |
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| 12 | |||
| 13 | The pin-out is as follows: |
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| 14 | |||
| 15 | |_.Pin|_.Name|_.Comment| |
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| 16 | |1|1PPS-|RS-422 1PPS GPS -> DUx| |
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| 17 | |2|1PPS+|RS-422 1PPS GPS -> DUx| |
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| 18 | |3|RxD|RS-422 in direction DUx -> GPS| |
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| 19 | |4|TxD+|RS-422 NMEA in direction GPS -> DUx| |
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| 20 | |5|TxD-|RS-422 NMEA in direction GPS -> DUx| |
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| 21 | |6|RxD|RS-422 in direction DUx -> GPS| |
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| 22 | |7|12V|supply voltage from DUx -> GPS| |
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| 23 | |8|GND|supply voltage from DUx -> GPS| |
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| 24 | |||
| 25 | The supply voltage pins on a [[DUL 20]] only provide 3.1V until the GPS receiver is detected by means of a 1kOums resistor between 12V and GND. At that point, the DUL sources the full 12V. |
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| 26 | |||
| 27 | 4 | laforge | The 1PPS output signal of the GPS 02 only becomes active once there is a GPS fix. |
| 28 | 3 | laforge | |
| 29 | h3. SMA for connection to GPS antenna |
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| 30 | |||
| 31 | This includes a 5V DC phantom voltage supply for the active antenna. |
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| 32 | 4 | laforge | |
| 33 | h2. LED |
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| 34 | |||
| 35 | There is a single green LED. |
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| 36 | * after power up, it takes some dozens of seconds until it first becomes active |
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| 37 | * slow green blinking light indicates powered up but no GPS fix |
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| 38 | * steady green light indicates powered up and GPS fix (1PPS output active) |
