User`s manual

VOLKTEK IRF-633 RS-232/422/485 TO 100BASE-TX DEVICE SERVER

3.5 DB9 Male Connector Pin Assignments

RS-232

(Full-duplex)

RS-422/485

4-wire

(Full-duplex)

RS-485

2-wire

(Half-duplex)

1 DCD

2 RX RX- **DATA B(-)

3 TX TX-

4 DTR

5 GND GND GND

6 DSR

7 RTS RX+ **DATA A(+)

8 CTS TX+

9 RI

NOTE: Bi-directional RS-485 BUS line.

3.6 Serial Connection

This Device Server / Managed Media Converter features DIP switches on the rear

panel that sets the unit to the correct type of cable configuration to support connection

with a RS-232 / 422 / 485 device.

Definition of DIP Switches

No Dip description Default

1 ON: Console / OFF: Data OFF

2 RS-232 ON

3 RS-422 / 485 (4W) OFF

4 RS-485 (2W) OFF

5 NA OFF

6 NA OFF

7 TMR (Terminator) OFF

For setting the control function of the serial port, see the table below:

DIP 1 Serial Connection

ON RS-232 Console

OFF Data Communication

NOTE:

1. If using console mode turn the DIP Switch 1 to ON position. For data

communication from the serial device keep the switch to OFF position. In case of

ON position data communication will be blocked and at OFF position console port

access.

2. For some RS-422/485 devices, which may not be designed to provide DB-9

connection, please check the pin definition to connect the devices.

3. For the first time installation, you have to use console mode to setup the IP and

TCP port configuration with RS-232 cable. Always use Cross Over cable, if using

Straight Through, you must use “Null Modem” to use Telnet option.