Campbell Garmin 16-HVS Especificaciones descargar pdf (Pagina 22)

Appendix B. CR23X Wiring and Programming

B.2.2 Reading GPS Data

Table B-2 is a sample CR23X P15 instruction for reading NMEA $GPGGA

data string. The second parameter has two dashes indicating data buffering has

been turned off. The CR10X does not have the data buffering option.

TABLE B-2. P15 for NMEA $GPGGA Data String

Parameter Data Description

1 1 Repetitions

2 66 -- Configuration code for RS232 ASCII data at 38400 baud

with data buffering turned off. The -- indicates data

buffering turned off. Decimal delimiter

3 1 Delay before sending data out

4 05 Control ports. Two digit format AB. A is for

handshaking and set to zero. B in this example is control

port 5 (datalogger RCV). GPS16X-HVS communication

cable: GPS transmit to control port 5 in this example

5 1 Input location where first character to transmit is stored.

Note: nothing is actually transmitted

6 0 Number of consecutive input locations to send

7 42 Termination character, 42 is ASCII equivalent of the

asterisk

8 100 Maximum number of characters to receive.

9 80 Delay in mS. How long to wait for $GPGGA string

10 1 Starting input location for time and position data

11 1 Multiplier, always 1.

12 0 Offset, always 0.

P15 parameters 4, 5, and 10 are somewhat variable. When using a CR23X,

parameter 4 can be set to 05, 06 or 07 depending on what control ports are

used. Wiring of the communication cable depends on the selection for

parameter 4. With a CR23X the GPS transmit wire is connected to the control

port selected in parameter 4.

P15 is executed when the PPS signal drives control port 8 high. P15 will wait

until one of three conditions is met: the time-out listed in parameter 9 has

expired, the maximum number of characters in parameter 8 have been read, or

the termination character listed in parameter 7 has been read.

P15 parameter 10 is the first input location you wish to store GPS data in.

Fifteen sequential input locations will be used to store time and position.

B-2

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 35 36

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Campbell Garmin 16-HVS Especificaciones Pagina 22