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