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RS-422/485/530 Pin Assignments (DB25 Male)
Signal
GND
RDB
RDA
CTSB
CTSA
DSRB
DSRA
DCDB
DCDA
TDB
TDA
RTSB
RTSA
DTRB
DTRA
TXCB
TXCA
RXCB
RXCA
TSETB
TSETA
Note: These assignments meet the EIA/TIA/ANSI-530 DTE specification
with the exception of Ring Indicator, which is not specified. It has been
included here for compatibility with systems requiring Ring Indicator.
© Sealevel Systems, Inc.
Name
Ground
RX+
Receive Positive
RX-
Receive Negative
CTS+
Clear To Send Positive
CTS-
Clear To Send Negative
DSR+
Data Set Ready Positive
DSR-
Data Set Ready Negative
DCD+
Data Carrier Detect Positive
DCD
Data Carrier Detect Negative
TX+
Transmit Positive
TX-
Transmit Negative
RTS+
Request To Send Positive
RTS-
Request To Send Negative
DTR+
Data Terminal. Ready Positive
DTR-
Data Terminal Ready Negative
TXC+
Transmit Clock Positive
TXC-
Transmit Clock Negative
RXC+
Receive Clock Positive
RXC-
Receive Clock Negative
TSET+
Terminal Timing Positive
TSET-
Terminal Timing Negative
- 13 -
Pin #
Mode
7
16
Input
3
Input
13
Input
5
Input
22
Input
6
Input
10
Input
8
Input
14
Output
2
Output
19
Output
4
Output
23
Output
20
Output
12
Input
15
Input
9
Input
17
Input
11
Output
24
Output
ULTRA 530.LPCI User Manual
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