A
B
C
C
B
A
UARTB
BA
A
B
C
C
B
A
BA
UARTA
A
B
C
C
B
A
BA
RS232: IC21, J6A
RS422: IC22, J6B, J7, J8
20MACL: IC23, IC24, J5 J9*, J10*
*: TRANSM.=J9, RECEIV.=J10
RS232: IC11, J2A
RS422: IC12, J3, J4
RS485: IC13, J1, J4*
*: IF END OF CABLE
PASSIVE=B, ACTIVE=A+C
BA
P1
C50
C42
C51
C31
C52
C10 C12
C61
IC8
J5
IC7
IC6
IC5
IC4
IC1
R23
R24
C36
C60
C40
R20
R21
R22
IC20
IC21
C33
C34
C35
C41
IC2
C32
C53
C56
C57
R1
R10
R18
R5
R6
R7
R8
R9
IC10
C30
C55
J1
R11
R2
R3
R4
C11
C13
R27
C63
R30
R34R33
R35
ANC
K
Z2
IC23
IC24
IC22
C62
C64
ANC
K
D1
R26
R28 R29
R19
ANC
K
Z1
C3
C4
IC3
C1
C2
R12
R13
R14
R15
R17 R16
IC12
IC11
IC13
F13
J6
J7
J10
J9
P3
F14 F10 F15 F11 F16 F12
F9
R32
R31
P2
F2 F3 F4 F5F8F7
J3
J2
J4
C54
F1 F6
IC9
ANC
K
ANC
K
R25
ANC
K
1-971642-01 P01
J8
4
5
3
2
1
8
9
7
6
+TXD
+5V DC
if GND strap
fitted
+RXD
MTG
MTG
-RXD
-TXD
190 EasyCoder PX4i and PX6i Service Manual
Chapter 16 — Interfaces
20 mA Current Loop (reconfiguration required)
Fit optocouplers
on IC23 and IC24
Fit strap on J5
Fit strap on J10
if printer is receiver:
A + C = active
B = passive
Fit strap on J9
if printer is transmitter:
A + C = active
B = passive
Connector Configuration
(20 mA Current Loop on "uart3:", "uart4:", or "uart5:")
DB-9 socket Signal Meaning
1 External +5VDC max 500 mA (automatic switch-off
at overload, short-circuit protected) provided a strap is
fi tted on J6 A which spoils the galvanic isolation.
2 +TXD +Transmit data
3 +RXD +Receive data
4–
5 GNDE Ground
6-
7 -RXD -Receive data
8 -TXD -Transmit data
9–
Remove RS-232 driver
circuit from IC21
Remove strap from J6 A
Note: Max. recommended baud rate 9600.