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The
RS232/RS422 converter provides a RS232 signal to a RS422 signal
conversion feature, which is used to expand long hung communication
distance via RS422 signal. The expandable transmission distance for a
RS232/RS422 converter is 3000ft.
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The
features of RS232/RS422 converter are :
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RS232 to RS422 / RS422 to RS232 converter. |
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Asynchronous communication protocol. |
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Each converter extends up to 3000ft communication distance. |
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Standard EIA RS232 / EIA RS422 interface. |
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Several converters can be treated as repeaters for
connecting to a long connumication distance. |
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AC power supported for 110V/220V selectable. |
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LED indicates when converter is operating. |
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LED indicates when power is in normal mode. |
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| The
package contains: |
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RS232/RS422 converter. |
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AC power adapter. |
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User's manual. |
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| Hardware
configuration: |
| 1. Block Diagram |
Observe the figure
shown in the following, the converter contains three LED indicators,
LED1 indicates power status, when LED1 is light means power is in
normal mode, LED2 indicates transmission data of RS232 signal and LED3
indicates transmission data of RSS422 signal.
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| 2. Signal Assignment |
| The signal
assignment of RS232 to RS422 converter is shown in the following. |
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RS232
Pin NO.
|
Description |
Description |
RS422
Pin NO.
|
| 2 |
TXD |
TXD(-)
TXD(+) |
14
2 |
| 3 |
RXD |
RXD(-)
RXD(+) |
15
3 |
| 4 |
RTS |
RTS(-)
RTS(+) |
16
4 |
| 5 |
CTS |
CTS(-)
CTS(+) |
17
5 |
| 6 |
DSR |
DSR(-)
DSR(+) |
18
6 |
| 7 |
GND |
GND |
7 |
| 8 |
DCD |
DCD(-)
DCD(+) |
19
8 |
| 10 |
|
CTRL1(-)
CTRL1(+) |
21
10 |
| 12 |
CTRL2 |
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|
| 20 |
DTR |
DTR(-)
DTR(+) |
9
20 |
|
| CTRL1 |
is the empty I/P for
user and |
| CTRL2 |
is in normal active
when it is floating and it could be controlled active or nonactive by
softward. |
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| The
signal assignment of a standard DB25 connector for RS232 is shown in
the following. |
DB25
Pin #
|
Signal Name
|
RS-232C
Name
|
Signal
Direction |
1
|
Chassis Ground |
(GND) |
AA |
Common
|
2
|
Transmit Data |
(TxD) |
BA |
Output |
3
|
Receive Data |
(RxD) |
BB |
Input
|
4
|
Request to Send |
(RTS) |
CA |
Output |
5
|
Clear to Send |
(CTS) |
CB |
Input |
6
|
Data Set Ready
|
(DSR)
|
CC
|
Input
|
7
|
Signal Groud
|
(SG)
|
AB
|
Common
|
8
|
Data Carrier Detect
|
(DCD)*
|
CF
|
Input
|
20
|
Data Terminal Ready
|
(DTR)
|
CD
|
Output
|
22
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Ring Indicator
|
(RI)
|
CE
|
Input |
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* Data Carrier Detect
(DCD) is also known as Received Line Signal Detector (RLSD).
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There are several
system configurations for different applications.
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| 3.
System Configuration |
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A. Communication
between RS232 and RS232
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| To connect your
repeater to DATA TERMINAL EQUIPMENT (DTE), we suggest the
following connection. |
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B. Communication
between RS232 and RS422
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