Black Box ETHERLINK IV User manual

ETHERLINK_IV -RS-232/485 over IP

ETHERLINK IV

S. 1

ETHERLINK_IV RS-232/485 over IP

! !

ETHERLINK_IV -RS-232/485 over IP

ETHERLINK IV

S. 2

Summary!....................................................................................................................................................................!3!

1! Etherlink_IV!Serial!Data!Handling!Possibilities!...................................................................................................!2!

2!!!Serial!Data!over!IP!(RSIP!ON)!.................................................................................................................................!4!

2.1!!!!UDP!PointGToGPoint!.......................................................................................................................................!4!

2.2!!!!UDP!PointGToGMultiPoint!...............................................................................................................................!5!

2.3!!!!UDP!Broadcast!Mode!....................................................................................................................................!6!

2.4!!!! TCP!PointGToGPoint!........................................................................................................................................!7!

2.5!!!!Configuration!Commands!for!Serial!Data!Transmission!over!IP!Networks!...................................................!8!

3!!! Applications!..........................................................................................................................................................!9!

3.1!!!!Serial!Data!Transmission!UDP!PointGToGMultiPoint!......................................................................................!9!

3.2!!!! COMGServer!(COM!Port!Extender,!Virtual!Serial!Port)!.................................................................................!11!

! !

ETHERLINK_IV -RS-232/485 over IP

ETHERLINK IV

S. 3

Summary

This document describes the RS-232 and RS-485 serial data transmission over an IP Network with

Etherlink_IV equipment. The following data transmissions are possible:

Point-To-Point

Point-To-MultiPoint

Broadcast

Com-Server Applications, Com Port Extender

The basic configuration commands are described too with some application examples. When using

Etherlink_IV equipment with RS-232 Emulation or Virtual Serial Ports on a computer some helpful utility

programs are mentioned.

Etherlink_IV !

S. 2

1 Etherlink_IV Serial Data Handling Possibilities

In Etherlink_IV there are several models available with 1xRS-232, 4xRS-232 or 1xRS-485 interfaces.

There are two ways to transmit the serial data:

MODE-1: Transmit over DSL, E1 or WAN (Wide Area Network) with command RSIP OFF

MODE-2: Transmit over IP (Internet Protocol) with command RSIP ON

When transmitting serial data over DSL/E1/WAN (MODE-1), there is a PTMP (Point-To-MultiPoint) command

available to realize bus and star topologies.

RS-232

DTE

WAN

RS-232

DTE RS-232

WAN

DTE

WAN

RS-232

DTE

WAN

RS-232

DTE

Picture 1.1. RS-232 Star Topology

RS-232

DTE

RS-232

DTE

RS-232

DTE

RS-232

DTE

WAN WAN WAN

Picture 1.2. RS-232 Bus Topology

The command PTMP ADD [IF] adds an interface to Point-to-MultiPoint group channel

The command PTMP DEL [IF] deletes an interface from Point-to-MultiPoint group channel

[IF] is the name of interface, such as:

RS, RS1 (RS-232/485 interface of the Etherlink_IV modem)

WAN1-WAN4 (WAN interface to transmit PTMP data through)

DSL1-DSL2 (DSL interface transmitting WAN)

To configure the serial data format please see in the manual the following commands:

RSRATE (for example RSRATE 115200, means baud rate 115200)

RSFORMAT (for example RSFORMAT 8N1, means 8 data bits, no parity, 1 stop bit)

Etherlink_IV !

S. 3

The picture below shows all available ways to transmit serial data using Etherlink_IV modem.

1xRS-232 / RS-485

Interface Card

RSIP OFF

NO PTMP

RSIP OFF

PTMP

PAYLOAD

Special

PACKET

DSL

4xRS-232

Interface Card

RSIP ON

MODE-1

PACKET

MODE-2

DSL

Ethernet

When WAN or

WANTS enabled

Picture 1.3. Ways to Transfer Serial Data

To sum up, we have the following situation. When serial data is carried as Payload (DSL) data, it is

transferred between two units connected with DSL. When serial data is carried within PTMP group, it can be

transferred through DSL and/or E1 lines where the PTMP function is active and when WAN transmission is

switched on. In this mode each RS-232 and RS-485 interface card will broadcast its data to all other PTMP

units in the network.

The RSIP ON functionality allows transferring serial data through any IP network. It combines the

advantages of two previous described modes:

Point-To-Point operation through IP network with any topology

Point-To-MultiPoint and broadcast operation

Independent configuration of the units

Can be used as any Computers COM port extender

! !

Etherlink_IV !

S. 4

2 Serial Data over IP (RSIP ON)

Serial data transmission can be done using UDP or TCP protocols. The UDP protocol allows operating in

both Point-To-Point (PTP) and Point-To-MultiPoint (PTMP) modes. Point-To-MultiPoint mode allows to set

up several broadcasting nodes and to build a broadcast configuration. The TCP/IP protocol allows only

working in Point-To-Point mode.

2.1 UDP Point-To-Point

In this mode two serial data endpoints should be configured with each other's IP Address and PORT Number

as illustrated on following picture. It means one side with IP_Address1:PORT_Number1 sends data to the

other side with

IP_Adress2:PORT_Number2

and vice versa.

RSIP UDP

RSIP IN 5000

RSIP OUT 192.168.0.236:5001

RSIP UDP

RSIP IN 5001

RSIP OUT 192.168.0.235:5000

192.168.0.235:5000 ←192.168.0.236:5001

RS-232

RS-485

192.168.0.235

Port 5000

Network

192.168.0.236

PORT 5001

RS-232

RS-485

192.168.0.235:5000 →192.168.0.236:5001

Picture 2.1. Serial Data Transmission with UDP Point-To-Point

Etherlink_IV !

S. 5

2.2 UDP Point-To-MultiPoint

In Point-To-MultiPoint mode the endpoint (“Master”) should have configured to send serial data with a

multicast IP Address (IPM) and some PORT Number (PORTM) as outgoing address. Outgoing data of such

an endpoint will reach all other endpoints. Endpoints with input PORT Number PORTM will accept received

data and other endpoints will discard it.

Non broadcasting endpoints should be configured as they work with “Master” endpoint in Point-to-Point

mode with incoming PORT Number set to PORTM.

Any multicast address acceptable in the application network can be used. Endpoints distinguish incoming

broadcast data by destination PORT Number (PORTM). Multicast addresses are IP Addresses in range from

224.0.0.0 to 239.255.255.255.

RSIP UDP

RSIP IN 5000

RSIP OUT 224.224.224.224:5001

(means IPM:PORTM)

192.168.0.235:5000 ←192.168.0.236:5001

RSIP UDP

RSIP IN 5001 (means PORTM)

RSIP OUT 192.168.0.235:5000

RS-232

RS-485

192.168.0.235

Port 5000

192.168.0.236

PORT 5001

RS-232

RS-485

Network 192.168.0.235:5000 →192.168.0.236:5001

192.168.0.235:5000 →192.168.0.237:5001

RSIP UDP

RSIP IN 5001 (means PORTM)

RSIP OUT 192.168.0.235:5000

192.168.0.235:5000 ←192.168.0.237:5001

192.168.0.237

PORT

5001

RS-232

RS-485

Picture 2.2. Serial Data Transmission with UDP Point-To-MultiPoint

Etherlink_IV !

S. 6

2.3 UDP Broadcast Mode

In this mode the endpoints should be configured to send their serial data to the multicast IP Address (IPM).

Incoming and outgoing PORT Number (PORTM) should be the same for all endpoints to receive each

other's serial data.

RSIP UDP

RSIP IN 5001 (means PORTM)

RSIP OUT 224.224.224.224:5001

(means IPM:PORTM)

RSIP UDP

RSIP IN 5001 (means PORTM)

RSIP OUT 224.224.224.224:5001

(means IPM:PORTM)

RS-232

RS-485

192.168.0.235

Port 5001

192.168.0.236

PORT 5001

RS-232

RS-485

Network

RSIP UDP

RSIP IN 5001 (means PORTM)

RSIP OUT 224.224.224.224:5001

(means IPM:PORTM)

192.168.0.237

PORT

5001

RS-232

RS-485

Picture 2.3. Serial Data Transmission with UDP Broadcast

Etherlink_IV !

S. 7

2.4 TCP Point-To-Point

In this mode one serial data endpoint should be configured as Server and the other as Client. Client

configuration is the same as UDP endpoint. On the Server endpoint the Client IP Address and incoming

PORT Number should be specified.

RSIP CLIENT

RSIP IN 5000

RSIP OUT 192.168.0.236:5001

RSIP SERVER

RSIP IN 5001

RSIP OUT 192.168.0.235

192.168.0.235:5000 ←192.168.0.236:5001

RS-232

RS-485

192.168.0.235

Port 5000

Network

192.168.0.236

PORT 5001

RS-232

RS-485

192.168.0.235:5000 →192.168.0.236:5001

Picture 2.4. Serial Data Transmission with TCP Point-To-Point

Etherlink_IV !

S. 8

2.5 Configuration Commands for Serial Data Transmission over IP Networks

Following configurations are possible when programming serial data over an IP Network:

Mode (UDP/TCP Client/TCP Server)

Local IP PORT Number for incoming serial data

Remote IP Address and PORT Number for outgoing serial data

Operation over IP Network or not (RSIP ON/OFF)

To enable the serial data transmission over IP Network functionality on the specific interface, it should be

removed from DSL Payload and from the PTMP group. The following commands allow configuring the

interfaces:

RSIP [[MODE]/ON/OFF] [IF]

RSIP IN [PORT] [IF]

RSIP OUT [ADDR] [IF]

[MODE] define the protocol and mode, such as:

UDP (Switch to UDP protocol for serial data transmission

CLIENT (Switch to TCP protocol for serial data transmission, Client side)

SERVER (Switch to TCP protocol for serial data transmission, Server side)

[IF] is the name of interface, such as:

RS or RS1 (if one 1xRS-232 or 1xRS-485 interface card is installed)

4RS,[channel_number] or

4RS1,[channel_number]

(if one 4xRS-232 interface card is installed)

4RS1,[channel_number]

4RS2,[channel_number]

(if two 4xRS-232 interface cards are installed)

[PORT] is the PORT_Number, decimal from 1024 to 65535 inclusively

[ADDR] is

[IP_Address:PORT_Number]

for UDP and TCP Client, but [IP_Address] for TCP Server mode.

IN and OUT have following meaning: It means to configure - INput or OUTput Address. With IN the local IP

port (listen port) will be configured that is used to receive serial data packets from the IP Network. With OUT

the remote IP Address will be configured where serial data packets will be forwarded to.

Examples for possible commands:

RSIP UDP RS (Switch serial data to IP Network with UDP protocol)

RSIP CLIENT 4RS,2 (Switch second channel of 4xRS-232 card to TCP Client mode)

RSIP IN 5000 RS1 (Receive and send serial data with PORT Number 5000)

RSIP OUT 172.16.53.1:5000 RS1 (Select endpoint with IP Address 172.16.53.1 and PORT Number

5000 as remote side for serial data)

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