Patton electronics 1202 Bedienungsanleitung

USER

MANUAL

MODEL 1202

High Speed Synchronous

Modem Eliminator

SALES OFFICE

(301) 975-1000

TECHNICAL SUPPORT

(301) 975-1007

Part# 07M1202-A

Doc# 049012UA

Revised 7/5/95

1.0 WARRANTY INFORMATION

Patton Electronics warrants all Model 1202 components to be free

from defects, and will—at our option—repair or replace the product

should it fail within one year from the first date of shipment.

This warranty is limited to defects in workmanship or materials, and

does not cover customer damage, abuse or unauthorized modification.

If this product fails or does not perform as warranted, your sole recourse

shall be repair or replacement as described above. Under no condition

shall Patton Electronics be liable for any damages incurred by the use

of this product. These damages include, but are not limited to, the

following: lost profits, lost savings and incidental or consequential

damages arising from the use of or inability to use this product. Patton

Electronics specifically disclaims all other warranties, expressed or

implied, and the installation or use of this product shall be deemed an

acceptance of these terms by the user.

1.1 RADIO AND TV INTERFERENCE

The Model 1202 generates and uses radio frequency energy, and if

not installed and used properly—that is, in strict accordance with the

manufacturer’s instructions—may cause interference to radio and

television reception. If the Model 1202 does cause interference to radio

or television reception, which can be determined by disconnecting the

unit, the user is encouraged to try to correct the interference by one or

more of the following measures: moving the computing equipment away

from the receiver, re-orienting the receiving antenna and/or plugging the

receiving equipment into a different AC outlet (such that the computing

equipment and receiver are on different branches).

1.2 SERVICE

All warranty and non-warranty repairs must be returned freight

prepaid and insured to Patton Electronics. All returns must have a

Return Materials Authorization number on the outside of the shipping

container. This number may be obtained from Patton Electronics

Technical Service at (301) 975-1007.

Packages received without an

RMA number will not be accepted.

Patton Electronics’ technical staff is also available to answer any

questions that might arise concerning the installation or use of your

Model 1202. Technical Service hours: 8AM to 5PM EST, Monday

through Friday.

2.0 GENERAL INFORMATION

Thank you for your purchase of this Patton Electronics product.

This product has been thoroughly inspected and tested and is

warranted for One Year parts and labor. If any questions or problems

arise during installation or use of this product, please do not hesitate to

contact Patton Electronics Customer Service at (301) 975-1007.

2.1 FEATURES

• Synchronous data rates to 512 Kbps

• Cable runs to 75 feet on each side of device

• Constant or RTS controlled carrier selections

• RTS-CTS delay options of 0mS or 6.6mS

• DB-25 connector on each end

• Half or full duplex

• Internal or external clocking

• No external power required

• LEDs monitor data and control signals

2.2 DESCRIPTION

The Patton Model 1202 high speed synchronous modem

elimnator allows two synchronous RS-232 DTE (host) devices to

communicate with each other without the need for expensive

synchronus modems. Supporting selectable data rates of 16, 32, 64,

128, 256 and 512 Kbps, the Model 1202 needs no AC power or

batteries for operation. The Model 1202 provides internal or external

clock options and operates half or full duplex. To emulate dial-up or

dedicated service, the delay between RTS and CTS can be set to either

0mS or 6.6mS. The carrier can be configured either as “constantly on”

or “controlled by RTS”.

Measuring only 5.3” x 2.0” x 1.2”, the Model 1202 is equipped with

a DB-25 connector on each end. Cable runs up to 75 feet on either

side of the device (150 feet total) are possible at the optimum data rate

of 64 Kbps. Tri-state LED indicators that monitor receive data, request

to send and data carrier detect on each side of the device.

3.0 CONFIGURATION

The Model 1202 is equipped with four strapping options that allow

configuration to a wide range of applications. To gain access to the

internal straps, loosen the hex nuts on the DB-25 connectors and pry

open the case between the plastic shell ears. Figure 1 shows the

location of each strapping option.

3.1 DATA RATE

The data rate strap controls the rate at which data is transmitted.

Adjust the strap to select one of the following options: 16, 32, 64, 128,

256 or 512Kbps, or external clocking. If “external clocking” is selected,

the Model 1202 will automatically match the clocking between your two

synchronous devices. The default setting is 64 Kbps.

3.2 CARRIER DETECT

The carrier detect straps allow you to determine whether the carrier

is “constantly on” or “controlled by RTS”. By adjusting the strap, you

may operate in switched carrier, multi-point and/or hardware

handshaking applications. Port 1 and port 2 may be configured

separately. The defaults setting is ON for both ports.

3.3 RTS/CTS DELAY

The RTS/CTS delay straps determine the amount of delay

between the time the Model 1202 “sees” RTS and when it sends CTS.

In order to emulate either dial-up or leased line modems, you can set

this strap at either no delay or 6.6mS. Port 1 and port 2 may be

configured separately. The default setting is 6.6mS for both ports.

3.4 GROUND

The ground strap setting connects the protective ground from port

1 or 2 to the Model 1202’s signal ground. The default setting is port 1.

3 4

Data Rate

Carrier Detect

Port 1 Port 2

224 kbps

112 kbps

56 kbps

28 kbps

14 kbps

7 kbps

External Clock

Port 1 Port 2

0 mSec

6.6 mSec

Constant

Port 1 Frame

Ground connects

to signal ground

Port 2 Frame

Ground connects

to signal ground

RTS/CTS Delay

Ground

Controlled

Data Rate

Carrier Detect

Port 1 Port 2

512 kbps

256 kbps

128 kbps

64 kbps

32 kbps

16 kbps

External Clock

Port 1 Port 2

0 mSec

6.6 mSec

Constant

Port 1 Frame

Ground connects

to signal ground

Port 2 Frame

Ground connects

to signal ground

RTS/CTS Delay

Ground

Controlled

Figure 1. Strap settings for the Model 1202

4.0 INSTALLATION

The Patton Model 1202 is very simple to install.

1. Configure according to the instructions listed in Section 3.0.

2. Turn off the computer or device to which the Model 1202 is to be

connected.

3. Plug the DB-25 connectors directly into the serial ports of your

RS-232 devices. If you wish to extend the distance, you may add

a cable not to exceed 75 feet on each side.

5.0 OPERATION

Once you have configured the Model 1202 properly (see Section

3.0) and plugged it into your equipment, you are ready to operate the

unit. After the Model 1202 is properly installed, it should operate

transparently—as if it were a standard cable connection. Operating

power is derived from the RS-232 data and control signals; there is no

“ON/OFF” switch.

5.1 LED Status Indicators

The Model 1202 features six front panel status LEDs that indicate

the condition of the modem eliminator and the communication link. The

diagram below shows the location of each of these LEDs. Following

the diagram is a description of each LED’s function.

•“TD” and “RTS” indicators blink with data activity.

•“CD” lights for an incoming signal on the line side and the resulting

output signal on the RS-232.

5 6

RTS

75 foot Cable 75 foot Cable

Model

1202

Sync. Host Sync. Host

APPENDIX A

SPECIFICATIONS

Data Rates: Strap selectable for 16, 32, 64, 128, 256 or 512 Kbps

Clocking: Strap selectable for Internal or external clock

Grounding: Protective ground (pin 1) may be strapped to signal

ground (pin 7)

Range: 75 feet on either side (for a total of 150 feet) at 64 Kbps,

range extends linearly for lower bit rates and decreases for higher

bit rates

Functional: Emulates half or full duplex, dial-up or dedicated line

RTS/CTS Delay: Selectable per port: 0mS or 6.6mS

DCD: Selectable per port as continuous or RTS controlled

Ring Indicator: Constantly ON

Interface: EIA RS-232C/CCITT V.24

Connectors: Choice of two male or two female DB-25 RS-232

connectors

Power Supply: None required

Altitude: 0 to 10,000 feet

Humidity: Up to 95% non-condensing

Dimensions: Approximately 5.3” x 2” x 1.2”

APPENDIX B

BLOCK DIAGRAM

7 8

Patton Model 1202

Block Diagram

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