User manual

NMEA Data Multiplexer - NDC-4

1. Five Opto-isolated Inputs.

All inputs are of the differential opto-isolated type and use

the unique Actisense low current drain circuitry (2mA @

2.0v) to conform in full with the NMEA 0183 marine

electronic device network communication standard, and

areexibleenoughtointerfacetomostfullyandpartially

compliant devices.

2. Two ISO-Drive Outputs.

The ISO-Drive outputs comprise of two connections: ‘+/A’

and ‘-/B‘ and conform in full to the NMEA 0183 standard.

3. RS232 Compatible Input/Output Option.

TheISOOUT0andOPTOIN0connectionscanbeused

asabidirectionalRS232compatibleportandisdesigned

for direct connection to a Personal Computer (PC) or other

marinedevicecapableofinterfacingtoastandardRS232

port.

WhenaUSBcableispoweredandpluggedintotheNDC-

4, this port switches to output only - i.e. the RS232 input

(OPTO IN 0) no longer operates.

4. A USB Input/Output (USB Variants Only).

The USB connector is designed for direct connection to a

PC’s USB port. Once the USB cable is powered and

plugged into the NDC-4, Port 0 switches to an output only

mode-thisallowstheUSBporttotakeoverbidirectional

control of the NDC-4.

5. Battery Supply Input.

Standardbatterypowerconnections(8to35v).

Notes:

1. To complete the NMEA 0183 standard all device

interconnectionNMEAcablesusedshouldmeetthetwo-

conductor, shielded, twisted pair conguration

specication.Theshieldconnectionofthesewiresshould

beconnectedattheinstrumentendonlytopreventground

loops.

2. Refer to “Specications” on page 19 for the full details

oninput/outputspecications.

TheNMEADataMultiplexer(NDC)hasscrew-terminal“Phoenix”typeexternalconnectionsfor:-

Connections

Figure 1 – All external connections

NMEA DATA COMBINER

99999

NDC-4-A-USB