GNSS Configuration

Where: Panel › GNSS Configuration · Serial menu 1 (messages: 2)

How the GNSS module of the MS2net reference station computes the position (how often, with which satellites), where a rover gets its RTK corrections from the Internet (NTRIP client), and which messages the module outputs.

Figure 1 — GNSS Configuration

Position

Field	What it does	Values	Factory	Serial
Measurement Rate	Positions per second (In Hz) or seconds between positions (or in seconds): one setting written two ways. A base always works at 1 Hz, see RTK corrections.	0.00012 to 10 Hz (serial: up to 20); the seconds box is the same value the other way round (serial: up to 8255 s)	4 Hz (0.25 s)	1 → 1 / 2
Dynamic Model	How the antenna is expected to move, so the measurements are filtered to match.	see below	Portable	1 → 3
Min SV Elevation	Satellites lower than this angle are not used.	0 to 90° (serial: 1 to 90)	10	1 → 13
Min C/N0	Weakest signal, in dBHz, a satellite must have to be used.	0 to 90 dBHz (serial: 1 to 90)	6	1 → 14

With the NTRIP client off, the last two serial items become 6 and 7.

• Measurement Rate: 4 Hz suits almost all field work. Raise it only for fast vehicles (more data on the card and the links); lower it for long static logging, to keep files small.
• Min SV Elevation: raise it (15°) where the horizon is cluttered and multipath is a problem; lower it only under a truly open sky.
• Min C/N0: 20–30 dBHz discards weak, reflected signals near trees or walls, at the cost of fewer satellites. The factory value is the module's own default.

Dynamic Model	When
Portable	General use, pole carried by hand.
Stationary	Antenna that does not move: base, monitoring point.
Pedestrian · Automotive · Sea · Bike · Wrist	Walking, road vehicles, boats, bicycles, worn on the wrist.
Airborne 1g / 2g / 4g	Aircraft and drones; the number is the largest acceleration expected.
Mower · E-Scooter	Offered only when the GNSS module supports them.

Constellations

The satellite systems used for the position: GPS/QZSS, SBAS (augmentation, EGNOS in Europe), Galileo, BeiDou, GLONASS. Factory: all enabled. Serial: 1 → 4, then one number per system; GPS and QZSS switch together.

At least one of GPS, Galileo, BeiDou and GLONASS must stay on, or the page answers Please choose one constellation. More satellites give a faster, more robust RTK fix: turn one off only when a job requires it or the corrections in use do not include it.

NTRIP client

Figure 2 — Animation: turning NTRIP client on

Enable NTRIP Client brings up the caster fields (example values).

Enable NTRIP Client makes the rover download corrections from a caster on the Internet, through a WiFi network saved in WiFi; it must stay in range of that network. The header then shows Startup Mode: Rover · NTRIP Client. The details come from the correction service, or from your own base (see Base › NTRIP server). Unticking the box keeps the fields for next time.

On a rover with Radio on ESP-Now the NTRIP client is not available: see ESP-Now radio › Radio channel and WiFi.

Field	What it does	Values	Factory	Serial
Enable NTRIP Client	Receive corrections from a caster.	on, off	off	1 → 5
Caster Host	Caster name or IP, without http://.	1 to 45 characters	empty	1 → 6
Caster Port	TCP port of the caster.	1 to 65535	2101	1 → 7
Caster User	User name on the caster.	text	empty	1 → 8
Caster User PW	Password of that user.	text	empty	1 → 9
Mount Point	Correction stream to receive.	1 to 30 characters	empty	1 → 10
List	Asks the caster for its mount points: see Mount point list.	button		1 → 15
Mount Point PW	Only for the few casters that protect the stream rather than the user.	text	empty	1 → 11
Transmit GGA to Caster	The rover sends its position to the caster. Network services (VRS, nearest mount points) need it or send nothing; harmless with a single base.	on, off	on	1 → 12

From the serial menu, a change to item 5 or any later item restarts the rover work when the main menu is closed, and puts the station in rover mode even if it was a base.

Mount point list

The List button beside Mount Point asks the caster which mount points it offers, so the name does not have to be typed. It needs Caster Host and Caster Port filled in and a network in WiFi with Internet access; Caster User and Caster User PW are sent too, for casters that show their list only to their users. The page uses the fields as they are, even before Save. The caster used for the list is not stored: the client settings change only with Save.

1. Press List. The page shows Asking the caster for its mount points: the station joins the WiFi network and downloads the caster's table, in a few seconds (up to about 40 when the network or the caster is slow).
2. The list appears below the field, one row per mount point: name, then format and place when the caster gives them. The row of the current Mount Point is highlighted.
3. Click a name: it goes into Mount Point and the page shows Mount Point set to …: press Save to keep it.
4. Press Save.

At most 40 mount points are shown; if the caster has more, the message says The first 40 mount points of the caster: pick one, and a mount point further down the table is typed by hand.

Message	When	What to do
7 mount points: pick one	list The list arrived (the number is the caster's).	Click a name, then Save.
The first 40 mount points of the caster: pick one	first 40 The caster has more than 40.	Pick from the list, or type the name.
Fill in Caster Host and Caster Port first	empty field One of the two fields is empty or out of range.	Fill them in and press List again.
The station needs a WiFi network with Internet access: add one in WiFi Configuration	no network The WiFi list is empty.	Add a network; it is used even before Save.
The station is not connected to a WiFi network with Internet access: check WiFi Configuration	no WiFi No network in the list is in range, or its password is wrong.	Check name and password of the network in WiFi.
Caster not reachable: check Caster Host and Caster Port	unreachable Wrong address or port, or the network does not reach the Internet.	Check the two fields and the network.
The caster refused Caster User or Caster User PW	refused The caster shows its list only to its users.	Check Caster User and Caster User PW.
The caster answered with error …	error The caster turned the request down for another reason; the number is its error code.	Check the address: it may not be a caster.
The caster lists no mount points	empty The caster answered with an empty table.	Ask the correction service for the mount point name.
The caster did not answer in time	time out Slow network or caster.	Press List again.
Not enough memory on the station: restart it and try again	memory The station could not set aside room for the list.	Restart the station and try again.
No answer from the station	station The page lost contact with the station.	Reload the page.

From the serial menu, item 15 (shown only with the NTRIP client on) prints the same list for the caster saved in items 6 to 9, with the same limit of 40; the chosen name is then entered with item 10.

Message Rates

Figure 3 — Message Rates

The messages the module outputs, written to the microSD card and sent to connected devices, grouped by family (NMEA, RTCM, NAV, NAV2, RXM, MON, TIM, PUBX…). Each box is 0 to 255: 0 off, 1 with every position, N once every N positions (at 4 Hz, a GSV at 4 comes once a second). Factory: NMEA GGA, GSA, GST, GSV, RMC. Serial: 2 → 1…9 opens one family; numbers missing from a list are messages the module does not support. RTCM here is what a rover outputs; a base uses Base › RTCM Rates.

Button	What it does	Serial
Surveying Rates	Everything off, then GGA, GSA, GST, RMC at 1 and GSV at 4.	2 → 10
Logging Rates	The same plus raw measurements RXM-RAWX and RXM-SFRBX at 1, for post-processing.	2 → 11
Turn off all messages	Serial menu only. Every rate to 0.	2 → 12
Turn on all messages	Serial menu only. Every message on: far more data than the card and links can carry, for tests only.	2 → 13

In the panel the buttons only fill the boxes until Save; in the serial menu items 10 to 13 act at once, without asking, and the rates reach the module when the menu is left with x. There, items 10 and 11 set GSV to once a second (4 at the factory 4 Hz; every position below 1 Hz), where the panel buttons always write 4.

More messages, more data

Every message adds to the stream. At high rates a long list can saturate the link to the module and the microSD card: enable only what is used.