Ma Current Loop - Intermec EasyCoder PF2i Service Manual

"uart3:" Configuration
Strap fi tted on J6 A
RS-232 driver circuit
fi tted on IC21
MTG
5
GND
9
4
DSR in
RTS out
8
3
RXD in
CTS in
7
2
TXD out
DTR out
6
+5V DC
1
MTG
Intermec EasyCoder PF2i, PF4i, and PF4i Compact Industrial—Service Manual
The serial communication port uart3: can be confi gured for three different
types of serial communication by fi tting or removing certain driver circuits
and straps:
• RS-232 non-isolated
• RS-422 non-isolated, full duplex
• 20 mA Current Loop
RS-232 Non-isolated (standard)
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-232 on "uart3:")
DB-9 socket Signal
1
2 TXD
3 RXD
4 DSR
5 GND
6 DTR
7 CTS
8 RTS
9 –
IC23 IC21
C11
C10
R27
R30
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)
Transmit data
Receive data
Data set ready
Ground
Data terminal ready
Clear to send
Request to send
Not used
Chapter 14—Interfaces
1-971642-01 P01
C12
IC20
C42
C34
P1
IC10
C51
C50
J1
185