8
7
6
5
4
3
2
1
TX-RX +
D
TERMINATE
TRANSMIT
TXT
JP1
1
JMP3
3
2
D
JP3
1
JMP3
3
2
VCC
R3
4.7K
14
U1
Y
Z
9
10
TX+
TX-
5
9
4
8
3
7
2
6
1
R1
120
P1
SRLXMT
SRLRCV
SRLENABLE
GND
C
5
4
3
C1
+
4.7UF
10V
TANT
C2
.1UF
50V
CER
2
DI
DE
RE
VCC
GND
GND
VCC
A
B
12
11
MAX491
RX+
RX-
TO HOST
C
RO
CONNECTOR DB9
RT ANGLE MALE
6
GND
7
R2
120
JP4
1
JMP3
TX-RX -
B
3
2
RXT
JP2
1
JMP3
TERMINATE
RECEIVE
3
2
B
COM TYPE
JP1
JP2
JP3
JP4
RS422
1-2
1-2
2-3
2-3
RS485
2-3
2-3
1-2
1-2
RS485 LAST
1-2
2-3
1-2
1-2
NOTE:RS422 IS CAPABLE OF FULL DUPLEX AND USES 2 PAIRS.
RS485 IS HALF-DUPLEX ON 1 PAIR AND MAY BE DAISY CHAINED
A
THE CP USES RS485. A SINGLE CP MAY COMMUNICATE WITH AN
RS422 HOST AS SHOWN IN THE TABLE.
A SINGLE PAIR MAY BE WIRED TO EITHER P1-1,9 OR P1-2,3
Title
FOR RS485.
Size
B
Date:
8
7
6
5
4
3
A
PERFORMANCE MOTION DEVICES
55 OLD BEDFORD RD
LINCOLN, MA 01773
RS422/485 Interface
Document Number
Thursday, April 11, 2002
2
Rev
A
Sheet
1
1
of
1