Intermec EasyCoder PX4i Service Manual page 197

Remove RS-232 circuit on
IC11
Remove strap on J2 A
Fit RS-485 driver
circuit on IC13
Fit strap on J4
if end of cable
(terminator)
Fit strap on J1
5
GNDE
9
4
-DATA
8
3
7
2
+DATA
6
1 +5V (0.5 A)
if GND strap
fitted
EasyCoder PX4i and PX6i Service Manual
RS-485 Isolated, Half Duplex (reconfiguration required)
UARTB
B B B A A A
J6
F13
J10 R35
J7
C C C
B B B
A A A
C C C
B B B
J8 A A A
R19
J9
F9
R32
P3
RS232: IC21, J6A
RS422: IC22, J6B, J7, J8
20MACL: IC23, IC24, J5 J9*, J10*
*: TRANSM.=J9, RECEIV.=J10
PASSIVE=B, ACTIVE=A+C
RS232: IC11, J2A
RS422: IC12, J3, J4
RS485: IC13, J1, J4*
*: IF END OF CABLE
R14
UARTA
B A
J2
R13
R15
R12
J3
P2 C54
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.
IC23 IC21
C11
C10
R30 R27
C63
C13
C62
R25
R28 R29
R26
C64
IC24
C36
IC3
C35
C3
C4
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
1-971642-01 P01
C12
IC20
C34 C42
P1
IC10
C51
C50
J1
187