SECTION SIX: Interfacing the 958 system

Using 200 ppnm output

The 958 provides an open-collector transistor output (on pin 14) that’s programmed to produce 200 pulses per nautical mile. The emitter of the NPN transistor is connected to ground, and its collector connects to the output pin (see Figure 16: ”Wiring for 200 PPNM output,” below). The output can sink 100mA, and can withstand a maximum positive voltage of 50 volts.If the output connects to an inductive device (for example, a relay), a spike suppression diode such as a 1N4001 should be connected across the load. Cathode connects to the power side of the device and anode connects to the output pin side. The output is normally open, switching to ground for 80ms. It supports speeds from zero to 100 knots (clamps at 100kt).

Figure 16: Wiring for 200 PPNM output

Configuring the RS-232 port

The RS-232 port on the NMEA connector is used to interface to any any compatible SC104 output or a PC for downloading waypoints or for uploading 958 software updates. The following sections describe the RS-232 port’s settings for SC-104 in, and copy port 1 and 2.

Using SC-104 in

THE SC-104 IN setting lets the 958 accept optional differential corrections from any source that transmits the standard SC-104 data stream. When using SC-104 IN, be sure that the BAUD RATE setting also matches the beacon receiver’s baud rate requirements.

Using copy port 1 and copy port 2

The COPY PORT setting lets you interface the 958 to many PC’s without using an RS422-to-RS232 converter. Many PC application programs can be used for waypoint/route loading, chart programs, data logging, etc. This function “copies” the output of the specified port 1 or port 2 data format (NMEA 0183 or Raytheon 0183) to the RS-232 port’s output for direct connection to the computer.

1.Press STAR to display the OPTIONS/SERVICE INFO screen, then press PORT SETUP OPTIONS.

2.Press PORT 1 SETUP or PORT 2 SETUP to confirm that the port you want to copy is now set to output the desired data format. If necessary, make changes now by

958 Installation Manual, Rev. A1

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NorthStar Navigation 800/628-4487, 978/897-6600 Using 200 ppnm output, Configuring the RS-232 port, Using SC-104
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