Furuno SC-120 - Manual (Page 69)

APPENDIX
A-3
Digital Interface
Output sentences of channel 1 (HDG OUT)
HDT, HDM, ROT, VTG, ZDA, GGA (Talker: GP)
Output sentences of channel 2 (NAV OUT)
ROT, Gpatt, VTG, ZDA, GGA, GLL
Transmission interval
HDG OUT HDT, HDM, ROT: 100 ms (two of three are selected.)
VTG, ZDA, GGA: 1 s
NAV OUT:
Gpatt, ROT: 100 ms (two of three are selected.)
200 ms (other cases)
VTG, ZDA, GGA, GLL: 1 s
Load requirements as listener
Isolation: Optocoupler
Input Impedance: 220 ohms (due to common use of output port, AD-10 and NMEA)
Max. Voltage: ±15 V
Threshold:
4 mA (In case of connection of FURUNO device talker)
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
data bits
start
bit
stop
bit