Sercel NR203 (Passive Corrections) -13
Description
Driver for Sercel NR103 and NR203.
Driver to be used to obtain raw GPS pseudo-ranges and various GPS broadcast data (as well as differential corrections) from a Sercel NR103 or NR203 series GPS receiver.
Driver Information
Driver | Sercel NR103 | Interface Type | Serial | Driver Class Type | Terminated <ETX> |
|---|---|---|---|---|---|
No | Input / Output | Input (two-way) | Executable | DrvNR103.exe | |
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System Configuration
To configure Sercel NR103 receivers, use the AUX and INIT menus. The following description defines only the essential settings; those not shown are not important to the operation of the Qinsy system.
QPS strongly recommends to interface to port A for the auxiliary position and to port B for the raw GPS output data.
Use the AUX menu to set the RS 232 parameters:
QPS recommends:
Baudrate | 19200 (or as high as possible) |
Databits | 8 |
Parity | N |
Stopbits | 1 |
Use the INIT menu to select the port messages:
Port A Messages: A1, A2, A3 ON, 1 sec update
All other messages on port A, as well as the raw data output should be switched off.
Port B Raw Data:CDAT, DGPS, SMEAS, SYNCH 600s 2*0.6 sec (In case a HF station has been selected on the receiver.) or CDAT, NONE, SMEAS, SYNCH 600s 2*0.6 sec (In case no HF but a RTCM station has been selected.)
All B-messages should be switched off.
Switch on the following messages in case you are using a NR103 only for retrieving HF corrections:
Port A or B Raw Data :CDAT, DGPS, OFF, SYNCH 600s 2*0.6 sec.
Interfacing Notes
It is important that the wiring is bi-directional. Every time Qinsy needs ephemerides (e.g. at initialisation), it will ask the receiver for it. This also applies to the case where only corrections are read from the receiver.
Therefore, the wiring of the 9-pin port A or port B of the NR103 receiver to a 9-pin or 25-pin multiple COM interface board (e.g. Digi 8e) must be as follows:
DB-9 | NR103 | DB-9 | COM | DB-25 | COM | ||
|---|---|---|---|---|---|---|---|
Pin 2 | TXD | ---------------------- | Pin 2 | RXD | Pin 3 | RXD | |
Pin 3 | RXD | ---------------------- | Pin 3 | TXD | Pin 2 | TXD | |
Pin 5 | SG | ---------------------- | Pin 5 | SG | Pin 7 | SG |
Note 1. In case the wiring can not be full duplex, it is possible to manually set the NR103 to send the ephemerides at initialisation time to the Qinsy system: Switch off the raw data output on the receiver (OFF), then turn it back on (SYNCH).
New ephemerides data will be send immediately.
Note 2. Also in case that a NR103 receiver is used only for receiving HF corrections (often the case in a configuration with more than one Sercel receiver), the link should always be bi-directional.
The program needs to ask for IOD information (in CDAT), which is not part of the HF correction message (DGPS).
Database Setup
If the differential corrections from the Sercel NR103 are also to be used, select the item "Auxiliary systems" and add a new "Differential corrections system" to the Qinsy Database.
Select the "Sercel NR103 (Passive Corrections)" driver and use the same interface parameters as with the satellite navigation system driver.
In most cases, HF Reference Station ID should be 1 (Slot number).
Verify this number by using the IO Test Utility (or HyperTerminal or PCPLUS). In the "#D" structure, the HF ID is the first number on each line.