TLS-1200XL
User’s Guide
for
Hughes Network Systems
Version 1.04
P/N 9007185-0002
7432 Alban Station Blvd., Suite A-105
Springfield, Virginia 22150-2321
(703) 912-4991
Table of Contents
Note
Description
Type of Service
Telephone Company Procedures
If Problems Arise
Patent Notice
Installation
Operation
TLS-1200 Mode
X.121 Mode
X.121 Mode Timing
Block Diagram
Sample Cable for connecting a TLS-1200XL to an IBM-style personal
computer or to a P.E.S.
Specifications
Written by Andrew Coile and Steve Stallings.
Revision 1.04
November, 1995
Copyright © 1995 by Practical Micro Design, Inc.
All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of the publisher.
This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense.
The TLS-1200XL is an interface unit that allows devices, which normally access a host modem via dial-up telephone circuits, to connect to local host equipment having an RS-232 port. The devices used with the TLS-1200XL must contain a Bell 212A compatible 1200 baud modem, or a Bell 103 compatible 300 baud modem. A typical application would be connecting credit card verification devices to a private data transmission system or a local host computer.
When the TLS-1200XL is installed, the telephone line originally connected to the user’s device can optionally be connected to a back-up line jack on the TLS-1200XL. The TLS-1200XL then emulates the telephone line to the user’s device. If the optional "fallback" mode is enabled and the user’s device indicates it wants to use the back-up line, the user’s device will be temporarily switched to the back-up telephone line.
The TLS-1200XL is designed to be used on standard device telephone lines. It connects to the telephone line by means of a standard jack called the USOC RJ-11C (or USOC RJ45S). Connection to the telephone company provided coin service (CO implemented systems) is prohibited. Connection to party line service is subject to state tariffs.
The goal of the telephone company is to provide you with the best service it can. In order to do this, it may occasionally be necessary for them to make changes in their equipment, operations or procedures. If these changes affect your service or the operation of your equipment, the telephone company will give you written notice to allow you to make any changes necessary to maintain uninterrupted services.
If you have any questions about your telephone line, such as how many pieces of equipment you can connect to it, the telephone company will provide this information upon request.
In certain circumstances, it may be necessary for the telephone company to request information from you concerning the equipment that you have connected to your telephone.
Upon request by the telephone company, provide the FCC registration number and the ringer equivalence number (REN) of the equipment that is connected to your line; both of these items are listed on the equipment label. The sum of all of the RENs on your telephone lines should be less than five in order to assure proper service from the telephone company. In some cases, a sum of five may not be usable on a given line.
If any of your telephone equipment is not operating properly, you should immediately remove it from your telephone line because it may cause harm to the telephone network. If the telephone company notes a problem, they may temporarily discontinue service. When practical, they will notify you in advance of this disconnection. If advance notice is not feasible, you will be notified as soon as possible. When you are notified, you will be given the opportunity to correct the problem and informed of your right to file a complaint with the FCC.
In the event repairs are ever needed on the TLS-1200XL, they should be performed by Practical Micro Design, Inc. or an authorized representative of Practical Micro Design, Inc. For information, contact: Practical Micro Design, Inc., 7432 Alban Station Blvd., Suite A-105, Springfield, VA 22150-2321, or call (703) 912-4991.
The X.121 features of this custom version of the TLS-1200 software created for Hughes Network Systems are covered by U.S. PATENT No. 5,280,625, issued to Hughes Aircraft Company.
The TLS-1200XL should be located near the equipment with the RS-232 port to which it will be connected. Long wires connecting the TLS-1200XL to the telephone lines are acceptable, whereas the cable carrying the RS-232 data should be as short as practical.
Make sure the telephone cables, RS-232 cable, and the cord to the power-pack will reach their intended destinations without stress.
Position the TLS-1200XL so the ON-LINE light is visible, if desired.
The unit should only be exposed to the environmental conditions typically maintained for computer equipment, i.e. temperature of 40°F to 85°F, and humidity of 10% to 90% (non-condensing).
There are four connectors on the rear of the TLS-1200XL. The left RJ11 jack is marked "LINE". A cable connecting the TLS-1200XL to the optional back-up phone line may go to this jack.
The right RJ11 jack is marked "EQUIP." A cable connected to the user’s device should be plugged into this jack.
The round connector marked "POWER" should be connected to the supplied power-pack.
There are four DIP switches, which control operation as follows:
Switch #1:
Up, Off, or Open: Unit set to TLS-1200 Mode.
Down, On, or Closed: Unit set to X.121 Mode.
In X.121 Mode:
Switch #2 |
Switch #3 |
Connection Mode |
Off |
Off |
Normal Connection Mode |
On |
Off |
Autoconnect Mode |
Off |
On |
Reserved, do not use |
On |
On |
Reserved, do not use |
In TLS-1200 Mode:
Switch #2 |
Switch #3 |
DTR Raised |
Off |
Off |
On complete carrier sync. |
On |
Off |
480mS early |
Off |
On |
On carrier sense (after 200mS debounce) |
On |
On |
When Verifone goes off-hook |
Switch #4:
Up, Off, or Open: Normal Operation
Down, On, or Closed: Fallback Mode Enabled
The RS-232 port is a male 9-pin sub miniature D-series connector. Its connections mimic those used by serial ports on AT-style personal computers, and are as follows:
Signal |
Signal |
TLS DB-9 |
Direction |
Description |
RXD |
TXD |
2 |
To TLS |
Serial data received to the TLS-1200XL. |
TXD |
RXD |
3 |
To External |
Serial data transmitted from the TLS-1200XL. |
DTR |
CD |
4 |
To External |
TLS Mode: Active
when off-hook, not switched to backup, and carrier present exact timing depends on DIP
switches. X.121 Mode: Raised in response to DTR going high from the P.E.S. |
GND |
GND |
5 |
Common |
Ground |
DSR |
DTR |
6 |
To TLS |
TLS Mode: Active
when external equipment active; Inactive causes equipment to switch to backup phone line. X.121 Mode: Must be raised in response to RI going high from the TLS-1200XL. If dropped, the call is aborted. |
RTS |
CTS |
7 |
To External |
TLS Mode: Used for
handshaking (raised if buffer less than half-full, otherwise dropped). Dropped at end of
call. X.121 Mode: Raised when P.E.S. raises DTR. Dropped when connection message is received. Used for handshaking (as above) during data transfer. |
CTS |
RTS |
8 |
To TLS |
TLS Mode: Ignored. X.121 Mode: After CD and CTS have been asserted, RTS must be high before any characters will be transmitted. |
— |
RI |
9 |
To External |
TLS Mode: Not used
(inactive). X.121 Mode: Raised to start the calling sequence. |
The TLS-1200XL has two operational modes: TLS-1200 mode and X.121 mode. The mode is controlled by the position of DIP Switch #1 when the unit is first powered on. If a change in any of the modes controlled by the DIP switches is desired, the DIP switches must be changed and power removed for at least 10 seconds. When power is reconnected, the TLS-1200 will read the DIP switches.
The front of the TLS-1200XL has one light marked "ON-LINE." This is illuminated only if:
When this light is off, the device plugged into the "EQUIP" jack is connected to the backup phone line which is plugged into the "LINE" jack.
If the TLS-1200XL is "ON-LINE" (the DSR signal is active) and the external equipment goes off-hook, the following will happen:
1. The TLS-1200XL will generate a dial-tone until:
- 2 seconds pass without any digits being dialed
- 3 seconds pass after one to four digits are tone dialed
- 200mS pass after five or more digits are tone dialed
- 2 seconds pass after any pulse dialed digit.
2. The TLS-1200XL will generate a modem answer carrier.
3. The TLS-1200XL will wait for an originate carrier from the external equipment, and will synchronize with the modem in the user’s device.
4. The TLS-1200XL will assert the DTR and RTS signals to indicate to the host equipment that a modem connection has been established.
5. The host equipment should prepare to communicate and then assert the CTS signal.
6. The host equipment and the user’s device will exchange data as required. All data will be transferred at 1200 baud. If the P.E.S. is sending data faster than the TLS-1200XL can accept, the TLS-1200XL will drop the RTS signal when its buffer is half-full, and raise it if the buffer is more than half-empty.
7. The connection continues until the user’s device goes on-hook, the modem carrier is dropped, or the host equipment de-asserts DSR.
Note that if the host equipment has the DSR signal inactive, so the TLS-1200XL is not "ON-LINE," and the external equipment goes off-hook and places a call through the backup link, then the TLS-1200XL is blocked from going into the on-line mode until the back-up call completes. This prevents the host equipment from interrupting a call on the back-up line (DSR is ignored for the duration of the call).
The front of the TLS-1200XL has one light marked "ON-LINE." This is illuminated only if:
When this light is off, the device plugged into the "EQUIP" jack is connected to the backup phone line which is plugged into the "LINE" jack.
If the TLS-1200XL is "ON-LINE" (the DSR signal is active) and the external equipment goes off-hook, the following will happen:
1. The TLS-1200XL will generate a dial-tone.
2. The user’s equipment dials the first digit, either using DTMF tones or pulse dialing. The TLS-1200XL stops the dial-tone.
3. The TLS-1200XL raises the RI signal.
4. Within 3 seconds, the P.E.S. must respond by raising the DTR signal.
5. The TLS-1200XL raises the CD and CTS signals, and drops the RI signal.
6. The P.E.S. raises the RTS signal.
7. If the TLS-1200XL is not in Autoconnect mode, the TLS-1200XL transmits "CALL " followed by the digits dialed by the user’s equipment in ASCII decimal characters (i.e. if the number dialed was (800) 555-1212, the string would be "CALL 8005551212".
8. If not in Autoconnect mode, within four seconds the P.E.S. must respond with "CONNECTION ESTABLISHED".
If in Autoconnect mode, within two seconds the P.E.S. must respond with "AUTOCONNECT 99".
10. If any of the above timeouts are not satisfied, RI, CD, and CTS will be dropped, and the TLS-1200XL will go back to waiting for the next call.
11. The TLS-1200XL will drop the CTS signal, and begin to generate a modem answer carrier.
12. The TLS-1200XL will wait for an originate carrier from the external equipment, and will synchronize with the modem in the user’s device.
13. The TLS-1200XL will assert the CTS signal to indicate to the host equipment that a modem connection has been established.
14. The host equipment and the user’s device will exchange data as required. All data will be transferred at 1200 baud. If the P.E.S. is sending data faster than the TLS-1200XL can accept, the TLS-1200XL will drop the CTS signal when its buffer is half-full, and raise it if the buffer is more than half-empty.
15. The connection continues until the user’s device goes on-hook, the modem carrier is dropped, or the host equipment de-asserts DSR.
Sample Cable for Connecting a TLS-1200XL to an IBM-style personal computer or to a P.E.S.
Signal |
Signal |
Direction |
TLS DB-9 |
PC |
PC |
P.E.S. |
RXD |
TXD |
To TLS |
2 |
3 |
2 |
2 |
TXD |
RXD |
To External |
3 |
2 |
3 |
3 |
DTR |
CD |
To External |
4 |
1 |
8 |
8 |
GND |
GND |
Common |
5 |
5 |
7 |
7 |
DSR |
DTR |
To TLS |
6 |
4 |
20 |
20 |
RTS |
CTS |
To External |
7 |
8 |
5 |
5 |
CTS |
RTS |
To TLS |
8 |
7 |
4 |
4 |
— |
RI |
To External |
9 |
9 |
22 |
22 |
Note: The PC cable is a "null-modem" cable, not a straight-through cable.
