Intermec EasyCoder 501 XP Service Manual page 132

16.6 Double Serial
Interface Board, cont.
No circuits on IC12, IC13, or IC14
RS-232 circuit fi tted on IC11
Strap on S5/S6 deactivated
(fi tted on one pin only)
Intermec EasyCoder 501 XP – Service Manual Ed. 4
"uart3:" Confi guration
The serial communication port "uart3:" can be confi gured for three
different types of serial communication:
• RS-232
• RS-422 non isolated
• 20 mA current loop
By fi tting or removing certain circuits and straps, the desired type
of interface can be selected. This is either done at factory or by the
customer.
When fi tting circuits yourself, do it before connecting the inter-
face board and make sure that the circuits are not fi tted upside
down (see front end markings in the illustrations in this chapter.)
Also take care so all "legs" of the circuit fi t into their respective
slots in the socket and are not bent. Also, take proper precau-
tions so as to protect the board and circuits from electrostatic dis-
charges.
"uart3:" RS-232 (standard confi guration)
F32
UART3
F24
RP2
IC14
F20
F23
F31
F34
F15
F16
F17
F18
F25
IC13
IC12
F33
F30
R27 R29
RS232: IC2
P4
RS485: IC4, S3, S4*
RS422isolated: IC3, S2, S4
UART2
RS422nonisol.: IC18, S1,S4
* Term. if end of cable
R11
F10
F11
R6
F12
R7
F13
F14
R4
F9
R5
F8
R10
F6
F5
F4 S4
F3
F7
F2
F1
IC4
P3
Chapter 16 Interfaces
Caution!
RS232: IC11
RS422nonisol.: IC12, S5
20mA CL: IC13, IC14, S6
R30 +
IC10
C8
+
+
R20
R21
R23
S5
R22
S6
IC11
IC15
C7
IC7
R3
R2
R1
C3
R15
+
+
+
+
IC18
S3
C11
S2
IC3 S1
IC2
1-971613-00.A01
C10
P2
C2
C1
R13
R12
R14
R8
IC6
C5
IC5
P1
131