Aximum Output Load (Rext ); Rs485 Communications - Alpha Moisture Systems SADPmini Instruction Manual

15.2 Calculating Maximum Output Load (R
Examples

16 RS485 Communications

The RS485 Half Duplex communications signal is driven by a MAX3471 interface chip. The
SADPmini connections are: -
RS485 (B)
RS485 (A)
GND
CON066
R
EXT
V = 5V : R
EXT EXT
V = 12V : R
EXT EXT
V = 15V : R
EXT EXT
V = 24V : R
EXT EXT
V = 28V : R
EXT EXT
Connector Pin 7
Connector Pin 1
Connector Pin 8
1 2 3 4 5
6 7 8 9
Page 24 of 33
)
EXT
– 0.6) - 105
= (V
EXT
0.02
= 115
= 465
= 615
= 1065
= 1265
Viewed from solder bucket side
RS485 (A)
RS485 (B)
GND