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ntp_server_ts01 [2023/03/30 02:23] – [Internal Interfaces] millerjsntp_server_ts01 [2024/11/14 02:30] (current) – external edit 127.0.0.1
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 ==== External Interfaces ==== ==== External Interfaces ====
 +=== Front ===
   * SMA female for GNSS Ant   * SMA female for GNSS Ant
   * 10/100 RJ45   * 10/100 RJ45
   * DC 5V input (5.5mm/2.1mm) - Marked 1A, but I haven't measured the device pulling more than 200mA   * DC 5V input (5.5mm/2.1mm) - Marked 1A, but I haven't measured the device pulling more than 200mA
 +  * OLED screen - blue - 128x64 pixels. Standard i2c module.
  
 +=== Back ====
 +Two 10 pin phoenix-style terminal blocks, marked COM A (left) and COM B (right). The pinouts are very strange. The first 8 pins of COMA all run to the pad marked A+ on the RS485 module. The first 8 pins of the COMB block all short to the pad marked B- on the RS485 module. The last two pins on each module are also the same - pin 9 goes to the GNSS PPS pin, and pin 10 goes to the ground pin on the output side of the RS485 module (NOT the board ground!).
 +
 +I think the idea is that you could run this thing to eight different systems over RS485?
 +
 +Serial data is sent over this interface at 19200 baud every ten seconds. The data looks like this:
 +
 +<code>
 +:\xB6\x16\x01\0\x17\x17\x03\x1E\x0B\x07&\x17\0\x11]\x01j\xD7N\0\x1A\xC0\0\x9B\xC5W\x94_
 +:\xB6\x16\x01\0\x17\x17\x03\x1E\x0B\x071\x17\0\x11]\x01j\xD5N\0\x1A\xC0\0\x9B\xC4W\x9A\x08
 +:\xB6\x16\x01\0\x17\x17\x03\x1E\x0B\x07;\x17\0\x11]\x01j\xD7N\0\x1A\xC0\0\x9B\xBFW\xAD\xB5
 +:\xB6\x16\x01\0\x17\x17\x03\x1E\x0B\x08 \x17\0\x11]\x01j\xD4N\0\x1A\xC0\0\x9B\xBDW\xBB\0
 +:\xB6\x16\x01\0\x17\x17\x03\x1E\x0B\x08\x13\x18\0\x11]\x01j\xD3N\0\x1A\xC0\0\x9B\xC1W$\xC2
 +:\xB6\x16\x01\0\x17\x17\x03\x1E\x0B\x08\x1D\x17\0\x11]\x01j\xD2N\0\x1A\xC0\0\x9B\xC2W$\x04
 +</code>
 +
 +COMA
 +  - A+ on RS485 module
 +  - A+
 +  - A+
 +  - A+
 +  - A+
 +  - A+
 +  - A+
 +  - A+
 +  - PPS
 +  - RS485 GND
 +
 +COMB
 +  - B- on RS485 module
 +  - B-
 +  - B-
 +  - B-
 +  - B-
 +  - B-
 +  - B-
 +  - B-
 +  - PPS
 +  - RS485 GND
 ==== Internal Interfaces ==== ==== Internal Interfaces ====
   * One button: Marked SW-PB, pulls the 3v3 rail of the LDO to ground through a 10k resistor   * One button: Marked SW-PB, pulls the 3v3 rail of the LDO to ground through a 10k resistor
Line 36: Line 77:
   * Entirely hand-assembled    * Entirely hand-assembled 
   * Small heatsinks mounted to the GNSS, MCU, and NIC - absolutely not needed   * Small heatsinks mounted to the GNSS, MCU, and NIC - absolutely not needed
 +  * PPS from the GNSS is not connected to the MCU anywhere as far as I can tell. NTP server performance will suffer accordingly.
   * OLED screen mounted perpendicular to the board via a female header sitting flat is very clever!   * OLED screen mounted perpendicular to the board via a female header sitting flat is very clever!
ntp_server_ts01.1680142997.txt.gz · Last modified: 2024/11/14 02:30 (external edit)
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