Symbol Technologies MK1000 - Manual (Page 38)

2-
8
M
K
100
0 M
ic
roKi
o
s
k
Pro
duc
t R
e
fere
nce
G
u
id
e
F
ig
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re
2-
2
. RS
-4
85
T
w
o
-Wire
Ser
ial
Net
w
o
rk
1 2 3 4 RS-232
GWG
1/2 W
100
Ω 100
Ω
Rt
GW
1/2 W 1/2 W
100
Ω 100 Ω
4000 Ft. Maximum
Termination Resistors at Both Ends
RS-232/RS-485
Conversion Box
Rt
1 2 3 4 1 2 3 4
GWG
GWG
100 Ω
100
Ω
100
Ω
100
Ω
1/2 W
GWG Green wire ground or power
system ground
Circuit ground or circuit
common
Rt 120 Ω 1/2W
Recommended RS-485 Two-Wire Multidrop NetWork