Add antenna short and open. Update NTP

Author: PaulZC

docs/displays.md

@@ -100,16 +100,13 @@ Upon successful reception and decryption of L-Band corrections, the satellite di
 
 Torch: ![Feature Not Supported](img/Icons/RedDot.png) / EVK: ![Feature Supported](img/Icons/GreenDot.png)
 
-On devices that support it, open circuit and short circuit detection is available on the GNSS antenna connection. The images below are for the RTK Reference Station. The same icons are used by the RTK EVK.
+On devices that support it, open circuit and short circuit detection is available on the GNSS antenna connection.
 
-![Reference Station indicating antenna open circuit](img/Displays/Antenna_Open.png)
+![RTK EVK indicating antenna open circuit](img/SparkFun-RTK-EVK-OLED_Antenna_Open_Highlighted.jpg)
 
-*Reference Station with the GNSS antenna disconnected (open circuit)*
+*RTK EVK with the GNSS antenna disconnected (open circuit)*
 
-![Reference Station indicating antenna short circuit](img/Displays/Antenna_Short.png)
+![RTK EVK indicating antenna short circuit](img/SparkFun-RTK-EVK-OLED_Antenna_Short_Highlighted.jpg)
 
-*Reference Station with a GNSS antenna cable fault (short circuit)*
+*RTK EVK with a GNSS antenna cable fault (short circuit)*
 
-When and ethernet-equipped RTK device is in Network Time Protocol (NTP) mode, the display also shows a clock symbol - as shown above. The value next to the clock symbol is the Time Accuracy Estimate (tAcc) from the UBX-NAV-PVT message.
-
-Note: tAcc is the time accuracy estimate for the navigation position solution. The timing accuracy of the TP pulse is significantly better than this. We show the tAcc as we believe it is more meaningful than the TIM-TP time pulse quantization error (qErr) - which is generally zero.

docs/img/Displays/SparkFun-RTK-EVK-OLED_Antenna_Open_Highlighted.jpg

@@ -35,7 +35,11 @@ Ethernet-equipped RTK devices can be placed into dedicated NTP mode, by pressing
 
 *Selecting NTP mode*
 
-Ethernet-equipped RTK devices will first synchronize its Real Time Clock (RTC) using the very accurate time provided by the u-blox GNSS module. The module's Time Pulse (Pulse-Per-Second) signal is connected to the ESP32 as an interrupt. The ESP32's RTC is synchronized to Universal Time Coordinate (UTC) on the rising edge of the TP signal using the time contained in the UBX-TIM-TP message.
+An Ethernet-equipped RTK device will first synchronize its Real Time Clock (RTC) using the very accurate time provided by the u-blox GNSS module. The module's Time Pulse (Pulse-Per-Second) signal is connected to the ESP32 as an interrupt. The ESP32's RTC is synchronized to Universal Time Coordinate (UTC) on the rising edge of the TP signal using the time contained in the UBX-TIM-TP message.
+
+When an Ethernet-equipped RTK device is in Network Time Protocol (NTP) mode, the display also shows a clock symbol - as shown above. The value next to the clock symbol is the Time Accuracy Estimate (tAcc) from the UBX-NAV-PVT message.
+
+Note: tAcc is the time accuracy estimate for the navigation position solution. The timing accuracy of the TP pulse is significantly better than this. We show the tAcc as we believe it is more meaningful than the TIM-TP time pulse quantization error (qErr) - which is generally zero.
 
 The RTK device will respond to each NTP request within a few 10s of milliseconds.