Intermec EasyCoder PX4i Service Manual page 187

Remove strap on J2 A
Remove RS-232 circuit
on IC11
Fit RS-485 driver circuit
Fit strap on J4
if end of cable
(terminator)
Fit strap on J1
-DATA
EasyCoder PX4i and PX6i Service Manual
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RS-485 Isolated, Half Duplex (reconfiguration required)
RS232: IC11, J2A
RS422: IC12, J3, J4
RS485: IC13, J1, J4*
* IF END OF CABLE
UARTA
Connector Configuration
(RS-485 Isolated on "uart2:" only)
DB-9 socket
MTG
1
5
GNDE
9
4
8
2
3
7
3
2
+DATA
6
+5V DC
1
4
if GND
5
strap fitted
MTG 6
7
8
9
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.
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REL4
REL3
REL2
REL1
C3
C4
R14
C2 C1
B A IC13
J2
R13
IC11 IC12
R15
R8
R12 R18
J3
R10
C56
R9
C57
C54
P2
Signal Meaning
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
+DATA
–
–
GNDE Ground
–
–
-DATA
–
Chapter 16 — Interfaces
R31
R32
R33
R34
R35
R36
R37
R38
C60
R27
R26
R25
R24
R23
R22
R21
C61
C51
C67
C34
C36
IC3
C66
P1
C33
C35
IC10
C50
J1
177