NAVELTEC
Speed Log Interface
NM-251B
RECREATIONAL BOATSFISHING VESSELSWORKBOATSMERCHANT MARINE
Power Supply
12/24 VDC
Input Ports
1 x closing contact analog interface
Output Ports
5 x buffered RS422/TTL + 1 x RS-232
The NM-251B is a Speed Log ppm output to NMEA0183® converter that enables connection of every speed log that uses the “closing” contact interface with digital systems and instruments that comply with the NMEA0183® standards Capable of converting the speed log contact closures to a standard NMEA$VWVHW string with checksum error control and output at TTL, RS422 and RS232 signal levels. It has one input port for connecting to the speed log that can be configured to interface both “closing” contact and optocoupler output type Speed Logs
Specifications
| Power Supply | 12/24 VDC |
| Input Ports | 1 x closing contact analog interface |
| Max Baud Rate | 4800 bps |
| Output Ports | 5 x buffered RS422/TTL + 1 x RS-232 |
Features & Functions
- Converts analog speed log pulses
- 1 x analog contact input (100-500 ppm selectable)
- 6 x output channels total (5 x RS422, 1 x RS232)
- Generates NMEA$VWVHW/$VMVBW
- Power supply 12/24 VDC
- Optically isolated input
- Fully IEC 60945 certified