4
5
3
2
1
8
9
7
6
TXD out
+5V DC
RXD in
DSR in
GND
MTG
MTG
DTR out
CTS in
RTS out
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
EasyCoder PX4i and PX6i Service Manual 185
Chapter 16 — Interfaces
"uart2:", "uart3:" & "uart4" Configuration (connector UART A)
The serial communication ports "uart2:", "uart3:", and "uart4:" can be
confi gured for up to three different types of serial communication respec-
tively by fi tting or removing certain driver circuits and straps:
• RS-232 non-isolated
• RS-422 isolated, full duplex
• RS-485 isolated, half duplex ("uart2:" only!)
RS-232 Non-isolated (standard)
Strap fi tted on J2 A
RS-232 circuit fi tted on
IC11
Connector Configuration (RS-232 on "uart2:", "uart3:", or "uart4:")
DB-9 socket Signal Meaning
1 External +5VDC max 500 mA (automatic switch-off at
overload, short-circuit protected)
2 TXD Transmit data
3 RXD Receive data
4 DSR Data set ready
5 GND Ground
6 DTR Data terminal ready
7 CTS Clear to send
8 RTS Request to send
9 – Not used