20
5 - ELECTRICAL CONNECTIONS
NETWORK CABLE FEATURES
Couple of conductors twisted and shielded
Section of conductor 0.22mm
2
…0,35mm
2
Nominal capacity between conductors < 50 pF/m
nominal impedance 120 Ω
Recommended cable BELDEN 3105A
5.14 MODBUS
AP1
Perform the RS 485 MODULE addressing by S3, S4 S5 ;
allowed and valid addresses from 1 to 127
S3 it sets the address dozens
S4 it sets the address units
S5 it sets the address hundreds
ON = 100, OFF = 0
S1 485 terminator: ON = termination YES
S2 line polarizer:
Inside the 485 net only one card must be polarized, usually
is polarized the master, i.e. the PC ; in this case
S2 = OFF = polarization NO
if more cards are polarized, faults occur
J1 RS 485 serial
J3 TTL serial
LV = GREEN LED :
OK
LR = RED LED QUICK FLASHING:
wrong address
faulty module
3
J
3S
4S
ON
ON
S1
S2
ON
RS485
LR
LV
J 1
G
N
D
-
+
5S
AP5
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