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15-1
15. DIGITAL INTERFACE
(IEC 61162-1EDITION 2)
Output sentences of channel 1, 2 (NMEA/CIF 1, NMEA/CIF 2)
VDR, VHW, VTG, VLW (talker VD), VBW, ROT
Input sentences of channel 1, 2 (NMEA/CIF 1, NMEA/CIF 2)
ZDA, GLL, VTG, DBT, RMA, RMC
Transmission interval
1 s for any sentence
Data transmission
Data is transmitted in serial asynchronous form in accordance with the standard referenced in 2.1 of
IEC 61162-1. The first bit is a start bit and is followed by data bits, least-significant-bit as illustrated
below.
The following parameters are used:
Baud rate: 4800
Data bits: 8 (D7 = 0), parity none
Stop bits: 1
D0 D1 D2 D3 D4 D5 D6 D7
Start
bit
Stop
bit
Data bits
Schematic diagram
1
2
3
4
5
9
5V
5V
470 ohm
CIF: ON
IEC 61162-1 (NMEA 0183) OFF
180 ohm
47 ohm
SRCN6A16/10P
CO-0.2X5P
MAX. 25mA
TXD-A
TXD-B
RXD-A
RXD-B
10
J2/J3
SRCN6A16/10S
22 ohm
47 ohm
47 ohm
22 ohm
NC
NC
66P3318
Load requirements as listener
Isolation: Optocoupler
Input Impedance: 30 ohms
Max. Voltage: 2.5V
Threshold: 4 mA
Output drive capability
Max. 25 mA