FIBER RS422 CONVERTER

The fiber optical converter allows the RS232 or RS422 input signals to be converted to fiber optional signals that for long distance, high speed, and high quality communication. There are 3 LED indicators correspond to RxD, CTS, and power signals. A 9V, 500mA-power adapter is provided in the package. To order the fiber optical converter, please select one of RS232 or RS422 version, and select one of DTE or DCE version for signal connection.

The features of fiber optical converter are :
Provides RS232 or RS422 signals.
Provides DTE or DCE mode signals.
One pair (two converters) is needed for two connected devices.
Communication distance up to 1500m.
Fiber Optical Communication speed up to 5 Mbps.
Operation temperature from 0C to 55C.
ST type fiber optical connector.
Suitable for three different optical fibers size : 50/125um, 62.5/125um, 100/140um.
Suitable for multi-mode cable.
HFBR-2416 fiber optical receiver and HFBR-1414 fiber optical transmitter are used.

The package contains:

Two (or one) fiber optical converters.
9V, 500mA power adapter.
User's manual.
DB25 male to DB25 female calbe.

Hardware Installation:
Your fiber optical converter is designed to be inserted in the RS232/RS422 port of your computer, please follow the setps listed below.
  1. Turn off all power to your computer and all devices before installing your fiber optecal converter.
  2. Connect fiber optical converter to RS232/RS422 port.
  3. Plugs in power adapter to fiber optical converter and connects it to remote site.
  4. Turn on the computer and power adapter.
Hardware configuration:
There are one female connector and four fiber optical connectors in the box, the signal assignments are shown below:

1. Fiber optical connector
RTS
CTS
TxD
RxD

2. RS232 connector for DTE mode
Pin #
DB25 Signal Name
RS232 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

3. RS232 connector for DCE mode
Pin #
DB25 Signal Name
RS232 Name
Signal Direction
1 Chassis Ground (GND) AA Common
2
Receive Data (RxD) BB
Input
3
Transmit Data (TxD) BA Output
4
Clear to Send (CTS) CB Input
5
Request to Send R CA Output

4. RS422 connector for DTE mode
Pin #
DB25 Signal Name
Signal Direction
2
Transmit Data (TxD+) Output
3
Receive Data (RxD+) Input
4
Request to Send (RTS+) Output
5
Clear to Send (CTS+)
Input
14
Transmit Data (TxD-)
Output
15
Receive Data (RxD-)
Input
16
Request to Send (RTS-)
Outputt
17
Clear to Send (CTS-)
Input

5. RS422 connector for DCE mode
Pin #
DB25 Signal Name
Signal Direction
2
Receive Data (RxD+) Input
3
Transmit Data (TxD+) Output
4
Clear to Send (CTS+) Input
5
Request to Send (RTS+) Output
14
Receive Data (RxD-) Input
15
Transmit Data (TxD-) Output
16
Clear to Send (CTS-) Inputt
17
Request to Send (RTS-) Output

To use the fiber optical converter, you mustt connect it with four fiber optical cables, then connect both DB-25 connectors to PC or devices (we call Device in the follow). Please note that, you must use DCE or DTE mode correctly, otherwise it can not work. Suppose the Device is DTE mode, you must set the converter to  DCE, otherwise if the Device is DCE mode, you must set the converter to DTE.

In the following, we will introduce how to set the hardware configuration in different modes, and also show the signal flow of both fiber optical converters. It is clearly that only connect transmit signal to receive signal and connect request to send signal to clear to send signal at one side.

A. Both DTE modes


TxD 2
-----
1 RxD




RxD 1
-----
2 TxD


Device
-----
RTS 4
----- 3 CTS
-----
Device


CTS 3
----- 4 RTS



B. One DTE node and one DCE mode


TxD 2
-----
1 RxD




RxD 1
-----
2 TxD


Device
-----
RTS 4
----- 3 CTS
-----
Device


CTS 3
----- 4 RTS



DTE mode
DCE mode
Fiber Optical Cables
DTE mode
DCE mode
Device side
Converter side
Converter side
Converter side
Device side

C. Both DCE modes


TxD 2
-----
1 RxD




RxD 1
-----
2 TxD


Device
-----
RTS 4
----- 3 CTS
-----
Device


CTS 3
----- 4 RTS



DTE mode
DCE mode
Fiber Optical Cables
DCE mode
DTE mode
Device side
Converter side
Converter side
Converter side
Device side

RS - 232 ( J1 , J2 , J3 , J4 )
DCE
1 - 2 SHORT
DTE
2 - 3 SHORT
RS - 232 PIN ASSIGNMENT
1
2
3
4
5
6
7
20
GND
TX
RX
RTS
CTS
DSR
GND
DTR
DTR , DSR
JIO          1 - 2            SHORT

RS - 422 ( J6 )
DCE
1 - 2 SHORT
DTE
2 - 3 SHORT
RS - 422 PIN ASSIGNMENT
1
2
3
4
5
7
14
15
16
17
GND
TX +
RX +
RTS +
CTS +
GND TX -
RX -
RTS -
CTS -
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