4
5
3
2
1
8
9
7
6
+DATA
+5V DC
if GND
strap fitted
GNDE
MTG
MTG
-DATA
P2
BA
C50
1-971643-01 P01
C67
RS232: IC11, J2A
RS422: IC12, J3, J4
RS485: IC13, J1, J4*
* IF END OF CABLE
UARTA
C40
C51
C34
C36
C60
C21
C22
C65
R26
R27
R35
R34
R33
R32
R31
R41
R42
R51
R52
R36
R37
R38
IC20
C61
R21
R22
R23
R24
R25
R28
IC21
IC27
IC28
C33
C35
C66
IC3
IC22
C32
C56
C57
R10
R18
R5
R8
R9
C55
C64
C23
C24
C25
C26
C27
C28
R43
R44
R45
R46
R47
R53
R54
R55
R56
R57
IC24
IC23IC26
C62
REL3
REL4
REL1
REL2
C63
R48
R58
P3
F2 F3 F4 F5F8F7F1 F6
R12
R13
R14
R15
R17 R16
J3
J2
J4
C54
IC9
C3
C4
C1
C2
IC12
IC11
IC13
IC10
C31
C52
IC6
IC5
IC4
IC1
C53
R1
R6
R7
C30
J1
R11
R2
R3
R4
P1
IC2
IC25
EasyCoder PX4i and PX6i Service Manual 177
Chapter 16 — Interfaces
Connector Configuration
(RS-485 Isolated on "uart2:" only)
DB-9 socket Signal Meaning
1 External +5VDC max 500 mA (automatic switch-off at
overload, short-circuit protected) provided strap is fi tted
on J2:A which spoils the galvanical isolation
2+DATA
3–
4–
5 GNDE Ground
6–
7–
8 -DATA
9–
RS-485 Isolated, Half Duplex (reconfiguration required)
Fit strap on J4
if end of cable
(terminator)
Remove RS-232 circuit
on IC11
Fit RS-485 driver circuit
Fit strap on J1
Remove strap on J2 A
Note: The increased use of LAN networks has made the RS-485 interface
somewhat obsolete, because RS-485 requires a special communication
protocol and a dedicated wiring system limited to 1,200 m (4,000 ft). We
only recommend RS-485 for existing applications and advice the customer
to consider a LAN network solution for new applications.