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Entry type: FAQ Entry ID: 9539062, Entry date: 12/03/2001
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Parameterizing the "ZyXEL U-90E" modem and the "2425MDX / BDX" modem

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QUESTION:
How should I parameterize the analog modem "ZyXEL U-90E" when a "2425MDX / BDX" modem is being utilized on the opposite side?

ANSWER:
The following describes all the settings required to set up a Teleservice connection between a PG and a SIMATIC S5. You need a TK858 both for the PG modem and for the PLC modem. The technical setup of your Teleservice connection then has the following configuration:

PG --- TK858 --- Modem "ZyXEL U-90E" --- / /-- Modem "2425MDX / BDX"-- TK858 -- PLC

The maximum speed on the modem line is set to 2400 Baud, because the "2425MDX / BDX" modem supports the modulation V.22bis as maximum. The settings are with reference to a 10-bit character frame (8 data bits, 1 stop bit and 1 start bit, no parity).
The complete configuration is done in several steps:

Step 1: Settings for both TK858 devices in the setup
Step 2a: Settings for the modem "2425 MDX" or
Step 2a: Settings for the modem "2425 BDX"
Step 3: Settings for the modem "ZyXEL U-90E"
Step 4: Setting up the connection to the partner modem
Step 5: Starting the STEP 5 online connection
Step 6: Clearing down the modem line connection

Important:
Make sure that you have parameterized the "ZyXEL U-90E" modem completely before you send it to the system side of your customer. For parameterizing you always need a PG/PC with terminal software installed. If this hardware and software is not available on the system side, then you cannot parameterize the modem any more.

Step 1: Settings for both TK858 devices in the setup

Basic settings: 10-bit character frame; 2400 Baud
Important:
If switch S1-1 is set to "OFF", then switch S1-2 is not evaluated.

Switch S1 (PG/PC and PLC side)

1

2

3

4

5

6

7

8

OFF

ON

ON

OFF

ON

ON

ON

OFF

Parity off

Parity even

1 stop bit

8 data bits

Baud rate 2400

Switch S2 (PG/PC side)

1

2

3

4

5

6

7

8

OFF

OFF

OFF

ON

ON

OFF

OFF

ON

Priority low

Fixed to OFF

CCITT

PG function

Manual selection

Rising edge

Dial-up line

Hooter OFF

Switch S2 (PLC side)

1

2

3

4

5

6

7

8

ON

OFF

OFF

ON

ON

OFF

OFF

ON

Priority high

Fixed to OFF

CCITT

PG function

Manual selection

Rising edge

Dial-up line

Hooter OFF

Notes:
The switch settings are effective only after switching the power OFF/ON.
The key switch on the TK858 on the PG side must always be in the horizontal position, otherwise switching from offline to online in the STEP 5 software does not function.

Step 2a: Settings for the modem "2425MDX"

Basic settings: 10-bit character frame; 2400 Baud

Note:
The 2425 MDX modem is only released for operation with TK858 in V1-06 and higher.

First perform the "Factory setting" function to get the modem into a defined state. Then set the following parameters for the connection with the TK858:

RATE SEL. PERM

MODE ASYNCHRON

CHAR. FORM 10

RATE R. EXTENDED

LOOP OFF

MODE PSTN

AUTO. ANSWER or MAN. ANSWER (depending on whether the modem is to pick up or not)

MODE 108.2

DISC 10 SEC

NO GUARDTONE

MODE WITH AT

MODE 105

ECHO OFF

ESCAPE OFF

ERRORCORRECT NO

AUTOM. DIAL (depending on whether the modem is to dial automatically or not)

MODE IPC/MFC (depending on local dial procedure)

TIMEOUT 40/60 SEC (choice)

MODE 109

NO AUT. CALL REP.

DISPLAY DIAL

V.25BIS-MODE

Step 2b: Settings for the modem "2425BDX"

Basic settings: 10-bit character frame; 2400 Baud

Note:
The modem 2425BDX in the setup should be release 8D or 9D.

Then set the following parameters for the connection with the TK858:

Rate

Perm

< x >

111

< >

Rate

1.2K

< >

2.4K

< x >

Mode

Asyn

< x >

Syn

< >

Timing

Ext

< >

114

< >

Timing

113

< >

115

< >

Ch.Form

8/10

< x >

9/11

< >

Ch.Form

08

< >

10

< x >

Ch.Form

09

< >

11 A

< >

Rate T.

Norm

< >

Exp

< x >

Mode

PSTN

< x >

LL

< >

Aut.Answ.

Man

< >

Aut

< x >

Mode

108.1

< >

108.2

< x >

Disc.

250m

< >

10s

< x >

Guardt.

550

< >

No

< x >

Guardt.

1800

< >

No

< x >

Mode

212A

< >

No

< x >

Delay

V.24

< >

No

< x >

Mode

W. AT

< x >

No

< >

Mode

105

< x >

Perm

< >

With

PC

< >

No

< x >

Echo

Off

< x >

On

< >

Comp

Hayes

< >

V.25B

< x >

Escape

On

< >

Off

< x >

Autom.

Dial

< x >

No

< >

Mode

IPC

< x >

MFC

< >

Timeout

40

< x >

60

< >

Auto.call

Rep

< >

No

< >

Mode

HDLC

< >

BSC

< >

Displ.

Dial

< x >

No

< >

Loops

On

< >

Off

< x >

Mode

109

< x >

Perm

< >

Step 3: Settings for the modem "ZyXEL U-90E"

The procedure for installing the "ZyXEL U-90E" modem is in the modem user guide, chapter 2, page 1 onwards. The user guide is on the CD provided in PDF format.

The "ZyXEL U-90E" modem does not have a configuration switch with which you can set parameters directly on the modem. The necessary AT commands must therefore be transferred to the ZyXEL modem via communications software and stored there. For this you can use, for example, the "Hyper Terminal" software from Windows. Before you do this, it is recommended to install the original modem driver for the " ZyXEL U-90E" from the data medium (e.g. floppy disk, CD-ROM) included in the delivery package. In MS Windows systems you install via "Start > Settings > Control Panel > Modems" (driver name: "ZyXEL U-90E"(V.90)+Fax). Once you have finished installing the driver, click the "Hyper Terminal" program ("Start > Programs > Accessories > Hyperterminal").
When "Hyper Terminal" starts you are prompted to enter the country code, the local code and call number. You are only requested once at the initial start to enter this information. You are then prompted to specify a name and choose an icon for the connection to be set up. Enter any name and acknowledge with "OK" (Figure 1).



Figure 1: Dialog for configuring the connection

In the next window that opens automatically you configure the interface to which you have connected the modem you are using (Figure 2). You must then close this window with the "Cancel" button, because the connection is to be set up later.



Figure 2: Interface assignment

Via the "File > Properties" dialog the "ZyXEL U-90E Properties" mask opens (Figure 3). You have specified the name "ZyXEL U-90E" in the "Connection Description" window.



Figure 3: Connection configuration

Click "Configure" in this window. Change the maximum speed from "57600" to "2400" and acknowledge with "OK". Also acknowledge the subsequent mask with "OK". Now save the new connection by clicking the "Save" command in the "File" menu.
Now you are ready to enter AT commands at this point.

Note:
The procedure described is also available in a slightly different form in the modem user guide, chapter 4, page 1 onwards. Please note that in the modem user guide the Windows user is addressed and not the customer who wants to implement the "ZyXEL U-90E" modem in conjunction with the TK858.

Parameterizing the "ZyXEL U-90E" modem by initialization string

Transfer the following initialization string to the modem "ZyXEL U-90E":
AT &F&N60&B1S18=9S20=9&D0X3S0=1&W0Z0
and acknowledge the input with "Enter". The modem responds with "OK".

Note:
The meanings of the AT commands are given in chapter 5 of the user guide, page 1 onwards.

With " AT &V0 " you can now display the current settings. For this, enter the AT command "AT &V0" and acknowledge your input with "ENTER". You then get the following display:

  Pict4.gif ( 13 KB )  

Step 4: Setting up the connection to the partner modem

This step is only necessary if the connection setup of the modem line is done on the PG/PC side from the "ZyXEL U-90E" modem. Information on this is available in the modem user guide, chapter 4, section 4.2 "Dialing and receiving calls ", page 3 onwards.

Example:
Enter the string
AT DT0,01234567890
and acknowledge your input with "Enter".

The call is initiated. After the connection has been set up successfully, the following text appears, for example:

RINGING

CONNECT 2400

Elements

Meaning

DT

= Dial tone

0

= Exchange dial code
(if required)

,

= 2 seconds dial pause

01234567890

= Actual number

There is also the option of saving the telephone number permanently in the call number memory of the modem. Using the appropriate AT command the call number can be dialed from the memory (see the modem user guide, chapter 4, section 4.4.1, page 8).

Step 5: Starting the STEP 5 online connection

Now you can change from the terminal software "Hyper Terminal" to STEP 5. There you can switch the operating mode from Offline to Online.

Important:
Please make sure that beforehand you clear serial RS232 connection line between the PG/PC and the "ZyXEL U-90E" modem. For the communication you must set up a connection "PG/ PC -- TK858 -- Modem U-90E".

Once the connection has been set up successfully the yellow "DCD" LED on the TK858 lights permanently.

The following LEDs light on the ZyXEL "U-90E" modem. The meaning of the LEDs is given in the modem user guide, chapter 2, page 2.



Figure 4: Front view of the modem

Step 6: Clearing down the modem line connection

Once you have finished your STEP 5 online session, you can initiate clearing down of the connection by pressing the "D/V" button on the "U-90E" modem. Clearing down the modem line connection can be done either via the modem on the PG/PC side or PLC side. Usually it is the user on the PG/PC side when he has terminated his STEP 5 online session.

Customer support:
If you have any questions about your ZyXEL product or need help, please get in touch with one of the worldwide ZyXEL subsidiaries that you can reach as follows:

Type

Germany

E-mail Support

support@zyxel.de

E-mail Sales

sales@zyxel.de

Website

www.zyxel.de
www.zyxel.com

Telephone

+49-2405-6909-0

Fax

+49-2405-6909-99

FTP software and ROM updating

ftp.zyxel.com
ftp.europe.zyxel.com

Postal address

ZyXEL Deutschland GmbH
Adenauerstr. 20/A2
D-52146 Wuerselen

Keywords:
Communications setting, Communications connection, Connection setup

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