Installation
Page 44
An example of connection to external display equipment is provided in Figure 45, and connections to other
equipment and sensors follow the same scheme. To determine the ‘A’ and ‘B’ signal lines on external
equipment use a digital volt meter to measure the signal line voltage referenced to ground. If the voltmeter
shows a negative voltage the ‘A’ signal line is being measured, a positive voltage indicates the ‘B’ signal line.
Figure 45 Example connection to external display equipment
The junction box provides jumpers to select alternative line termination configurations for data input
connections from remote equipment. The line termination options are:
●
None - no line termination, suitable for short cable runs less than 10m (as supplied).
●
R
- 120 Ohm line termination, suitable for longer cable runs greater than 10m.
●
RC
- AC 120 Ohm / 1uF termination. Not used.
Select the appropriate line termination option for each data input connection using the jumper adjacent to the data
input connection in the junction box. The jumper positions for each termination option are shown in Figure 46.
Figure 46 Line termination options
A
B
EXT_DISP_IN
GND
A
B
PILOT_IN
GND
A
B
DGPS_IN
GND
A
B
LR_IN
GND
A
B
SEN1
GND
A
B
SEN2
GND
A
B
SEN3
GND
A
B
EXT_DISP_OUT
GND
A
B
PILOT_OUT
GND
A
B
DGPS_OUT
GND
A
B
LR_OUT
GND COM NC
ALARM
NO GND GND
SHIELD
GND SM BS
SWITCHES
COM
A
B
EXT_DISP_IN
GND
A
B
PILOT_IN
GND
A
B
EXT_DISP_OUT
GND
A
B
PILOT_OUT
GND
Transmit A
External displa
y
s
y
stem.
e.g. ECDIS
Connect shield if required
Transmit B
Receive A
Receive B
EXT_DISP_IN A
EXT_DISP_IN B
EXT_DISP_OUT A
EXT_DISP_OUT B
No line ter
m
ination
(default)
120 Oh
m
line
ter
m
ination (R)
120 Oh
m
/ 1uF line
ter
m
ination (RC)
