Omega Engineering OMG-CONV-485-ISO 사용자 설명서
Technical Description
OMG-CONV-485-ISO
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Technical Description
The OMG-CONV-485-ISO converts an existing RS-232 serial port into a field
selectable RS-422/485 port for industrial automation and control applications.
selectable RS-422/485 port for industrial automation and control applications.
Connector Pin Assignments
RS-232 Signals (DB-25 Female)
Signal
Name
Pin #
Mode
GND
Ground
7
RD
Receive Data
3
Input
CTS
Clear To Send
5
Input
DSR
Data Set Ready
6
Input
DCD
Data Carrier. Detect
8
Input
RI
Ring Indicator
22
Input
TD
Transmit Data
2
Output
RTS
Request to Send
4
Output
DTR
Data Terminal Ready
20
Output
Note: These assignments meet EIA/TIA/ANSI-232E DTE
Technical Note: The modem control signals are biased in the following
fashion: RTS and CTS are connected, DTR is connected to DCD and
DSR, and RI is tied inactive.
DSR, and RI is tied inactive.
RS-422/485 Pin Assignments (6 Position Screw Terminal)
Signal
Name
Pin #
Mode
RDB
RX+
Receive Data Positive
1
Input
RDA
RX-
Receive Data Negative
2
Input
TDB
TX+
Transmit Data Positive
3
Output
TDA
TX-
Transmit Data Negative
4
Output
GND
GND
Ground
5
SHIELD
SH
Shield
6