SERIES IP521 INDUSTRIAL I/O PACK EIA/TIA-422B SERIAL COMMUNICATION MODULE
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RS-422B
INTERFACE
I/O
UART B
PORTS
E to H
PORT I/O
+5V
NOTE: TERMINATION RESISTOR (RT) AND
BIAS RESISTOR (RB) SIPS ARE MOUNTED
IN SOCKETS AND MAY BE REMOVED IF
REQUIRED
P
O
R
T
A
B
R
RxD-
RxD+
TxD+
TxD-
R
T
R
T
R
B
+5V
R
RxD-
RxD+
PORTS
B to G
TxD+
R
B
T
R
B
R
TxD-
T
+5V
P
O
R
T
H
ADDRESS BUS
DATA BUS
LOGIC
INTERFACE
P1
CONTROL BUS
ACKNOWLEDGE
+5V
CONTROL LOGIC
GENERATOR
& ID
INFORMATION
UART A
PORTS
A to D
+5V
CONTROL LOGIC
COMMON
+5V
SUPPLY
FILTERING
+5V
GND
4501-713A
COMMON
C
O
M
M
O
N
P2 PINS 1, 6, 11, 16, 21, 26, 31, 36,
& 41 ARE SIGNAL COMMON
IP521 BLOCK DIAGRAM
