Salter Brecknell WB-521 Series - Manual (Page 12)

10 SBI521 Service Manual
1.4.3 RS-485 Serial Port Connections
The SBI-521 indicator comes standard with one RS-485 network port designed for local
networks and multidrop communication links. Refer to
Table 1.10 and Table 1.11 on
page 12 for COM2 jumpers.
Figure 1.5 RS-485 Connection
Table 1.4 RS-485 Port Connections
Table 1.5 Termination Resistor Jumper (JP4)
1.4.4 Power Supply Connections
The SBI-521 comes standard with an external AC to DC power adapter. Simply plug
the AC adapter into the indicator DC power jack and then plug into a standard wall
outlet.
Table 1.6 Adapter Power Input Connector (ADP)
Table 1.7 Battery Power Input Connector (BAT)
Designation Description Pin Electrical Level
A RS-485 signal A 1 0 - 5 VDC
B RS-485 signal B 2 0 - 5 VDC
GND ground/common 3 0 VDC
Connected Pins Function
1-2 RS485 terminal 120ohm resistor on board is disabled
2-3 RS485 terminal 120ohm resistor on board is enabled
1
GND
B
A
3
IMPORTANT: Make sure that the AC voltage appearing at the wall outlet
matches the input voltage marked on the AC adapter.
Pin Definition In/Out/Power Electrical Level
1 Adapter input voltage + Power input 12VDC (10.5-15VDC, ≥0.5A)
2 Adapter input voltage - (GND) Power ground 0Vdc
3 Shell Earth N/A N/A
Pin Definition In/Out/Power Electrical Level
1 Battery input voltage + Power input 5.6-7.2Vdc (6V/2.8AH lead acid battery)
2 Battery input voltage -(GND) Power ground 0Vdc