SPANISH VERSION

Model 201/207/209/221/227

Short Haul Modems and Line Drivers

 
 

Reference Manual

0315-0227 Rev. D

  

Printed 11.13.02 
 
  
 
FCC Information
Models 201, 207, 209, 221 and 227

WARNING: This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause interference to radio communications. It has been tested and found to comply with the limits for a Class A computing device pursuant to Subpart B of Part 15 of FCC Rules, which are designed to provide reasonable protection against such interference when operated in a commercial environment. Operation of this equipment in a residential area is likely to cause interference, in which case the user, at his own expense, will be required to take whatever measures may be required to correct the interference.

Certificate Of FCC Compliance for Canada

This digital apparatus does not exceed the Class A limits for radio noise emissions from digital apparatus set out in the Radio Interference Regulations of the Canadian Department of Communications.

Le present appareil numerique n'emet pas de bruits radioelectriques depassant les limites applicables aux appareils numeriques de la classe A prescrites dens le Reglement sur le brouillage radioelectrique edicte par le ministere des Communications du Canada.


Table of Contents

1.0  General Description
1.1     DataSpy Feature (Model 221/227)

2.0 Specifications
2.1     Interface
2.2     Data Rate
2.3     Transmission
2.4     Switches
2.5     Indicators
2.6     Operating Distance
2.7     Power
2.8     Size
2.9     Environment

3.0 Installation
3.1     Digital Interface
3.2     Analog Interface

4.0 Operation
4.1     Model 201/207/221/227
4.2     Model 209
4.3     Model 221/227

5.0 Troubleshooting

6.0 Connector Pin Assignments
6.1     Model 201/207/221/227
6.2     Model 209

7.0 Power
7.1     Model 201/207/221/227
7.2     Model 209

8.0 Help


1.0 General Description

The Model 201/207/209/221/227 performs full-duplex transmission of asynchronous data over four wires (two twisted pairs). The data transmission between each line driver utilizes differential signaling that is immune to electrical interference and therefore makes it ideal for use in light manufacturing and industrial office areas. All five models are compatible with each other up to speeds of 19.2 kbps, while the Model 207/227 operates up to 115 kbps.

1.1 DataSpy Feature (Model 221/227)

Your new Telebyte product incorporates the Patent Pending DataSpy feature, an LCD display designed to assist with initial installation and check-out. Thereafter it can be used as a performance monitor. In the case of a system problem it provides information as to the status of the local link.



Figure 1: The DataSpy LCD display.
 

The display of the Telebyte logo on the LCD display indicates that the unit is powered. For power stealing devices such as a modems, it indicates that sufficient power is being applied to operate the device. The LCD display uses less than 1 milliwatt of power.

The data display on the LCD consists of graphical representations for TD (Transmit Data) and RD (Receive Data). These signals are displayed the way a bit-change waveform would appear on an oscilloscope. Ordinarily, TD and RD are low (a minus voltage) in the quiescent state. When data is transmitted, the transmit signal is brought high to a positive voltage. These two signal states are displayed on the LCD by either a low segment or a high segment. The low segment represents the minus voltage (i.e., the mark condition) while the upper segment represents a positive voltage (i.e., the space condition). The vertical bar connecting the lower segment to the upper segment is always on when power is applied.

If the transmit signal is in the quiescent state (continuously low) only the lower segments and the vertical bar are illuminated. This is an indication of a constant negative state.
If the transmit or receive inputs to the device are streaming (in the positive mode continuously), the LCD display shows the vertical segment and the upper segments only. For those cases where there is valid data transmission, both the upper and lower segments are displayed simultaneously. A variation in display intensity between lower and upper segments gives the user a perception of the amount of data being transmitted.

The LCD display also shows the status of the following control signals: CTS, RTS, DSR, DCD, and DTR. These signals are displayed as mnemonic symbols, composed of three letters each, on the bottom line of the display. The presence of the three-letter mnemonic indicates that the respective control signal is high (positive).

 
If the control signal is negative, the three-letter mnemonic is not displayed. For most full-duplex data-only modems, CTS and RTS are connected together while DSR, DCD, and DTR are connected together. For handshaking modems there is a relationship among the various control signals on both ends of the link. This relationship is dependent upon the control signals utilized. All units conform to EIA RS-232 and CCITT V.24 specifications (except for Model 209 where the connector pinout complies with IBM PC com ports).

2.0 Specifications

2.1 Interface

Connectors

RS-232:
Model 201: DB-25M or DB-25F
Model 207: DB-25M
Model 209: DB-9F
Model 221: DB-25M or DB-25F
Model 227: DB-25M or DB-25F

Analog:

Model 201: RJ-11 and four screw terminals.
Model 207: RJ-11 and five screw terminals.
Model 209: RJ-11 or four screw terminals, as ordered.
Model 221: RJ-11 and five screw terminals.
Model 227: RJ-11 and five screw terminals.
 

Note: The Model 201/207/209/221/227 can be ordered with an RJ-45 installed, in place of the RJ-11, by adding "P2" to the end of the respective model number (e.g., 227MP2).

2.2 Data Rate

Model 201/209/221: 0 to 19.2 kbps.

Model 207/227: 0 to 115.2 kbps.

2.3 Transmission

Asynchronous full duplex over four wires (two twisted pairs).

2.4 Switches

Each modem is equipped with a DTE/DCE switch to allow reversal of the TD and RD signals on the RS-232 interface.

2.5 Indicators

The Model 221/227 is equipped with an LCD display for data, five control signals and power.

 

Baud Rate

Distance (miles/km)

 

Model 201/209/221

Model
207/227

115 kbps

NA

.6/1

19.2 kbps

1.2/1.9

1.2/1.9

9.6 kbps

3.1/5

3.1/5

4.8 kbps

4.9/7.9

4.9/7.9

2.4 kbps

6.2/10

6.2/10

 
2.6 Operating Distance

The previous table gives maximum distance as a function of Baud rate (over 24 AWG wire).

2.7 Power

Derived Power From Interface

Model 201/207/209/221/227: The unit attempts to derive its power from any one of the control signals which are expected to be at least +5.5 V or -5.5 V in the quiescent state. If there are no control signals available to the modem, then power is derived from the Data Input pin. The Data Input pin must be at least -5.5 V in the quiescent state.

Model 201/207/221/227: If Pin 4, 5, 6, 8 or 20 is powered, the unit takes power from that pin.

Model 209F: If Pin 1, 4, 6, 7, or 8 is powered, the unit takes power from that pin.

2.8 Size

Model 201:

2" W x 2.75" L x 0.75" H
(50.8 mm x 69.85 mm x 19.05 mm)

Model 207:

1.7" W x 4" L x 0.65" H
(43.18 mm x 101.6 mm x 16.51 mm)

 
Model 209:

1.3" W x 3" L x 0.75" H
(33.02 mm x 76.2 mm x 19.05 mm)

Model 221/227:

2" W x 4.15" L x .79" H
(50.8 mm x 105.4 mm x 20.1 mm)

2.9 Environment

0 to 50o C, 5 to 95% relative humidity.

3.0 Installation

3.1 Digital Interface

3.1.1 The digital interface for the Model 201/221/227 is a DB-25 connector. The Model 201/221/227 may be ordered with either a male or female connector. The gender of the connector is indicated by the first letter in the suffix of the model number. For example, the Model 201M has a male connector and the Model 201F has a female connector.

3.1.2 The digital interface for the Model 207 is a DB-25 male connector. The Model 207 comes equipped with a mini gender changer if it is necessary to interface to a male DB-25.

3.1.3 The digital interface for the Model 209 is a DB-9 female connector.
 

3.2 Analog Interface

Note: The four-wire line between modems must be two twisted pairs. On each modem, the wires marked T+ and T- must be members of the same twisted pair and those marked R+ and R- must members of the other pair.

3.2.1 Screw Terminals

The Model 201/209FT is supplied with four screw terminals marked T+, T-, R+ and R-. The Model 207/221/227 is supplied with five screw terminals marked T+, T-, R+, R- and GND. When connecting two line drivers together the T+ terminal of one unit goes to the R+ terminal of the other; the T- terminal goes to the R- terminal.

3.2.2 Phone Plug

The Model 201/207/221/227/209FP is equipped with a standard RJ-11 modular phone connector. Only four of the six positions are used. If ordered with the RJ-45 option (P2) only the four middle pins are used. The designation of the wires is shown on the next page.
 


Figure 3: Female RJ-11 wire designation.

 

4.0 Operation

 

4.1 Model 201/207/221/227

This model is equipped with a DTE/DCE switch that allows for reversal of Pins 2 and 3 of the RS-232 connector. When the switch is in the DTE position, Pin 2 of the RS-232 connector is an output (transmit-to-host device) and Pin 3 is an input. When the switch is reversed to the DCE connection, Pin 2 becomes an input and Pin 3 an output. When interfacing to a terminal or PC the switch should be in the DCE position.

 

4.2 Model 209

This model is equipped with a rotary DTE/DCE switch that allows for the reversal of Pins 2 and 3 of the RS-232 connector. When the switch is in the DTE position, Pin 3 of the RS-232 connector is an output (transmit-to-host device) and Pin 2 is an input. When the switch is reversed to the DCE connection, Pin 3 becomes an input and Pin 2 an output. When interfacing to a terminal or PC, the switch should be in the DCE position. A small screwdriver is supplied to facilitate the switching.

4.3 Model 221/227

The LCD display verifies operation.
 

 

5.0 Troubleshooting

The following is a list of problems that may occur during the installation and some suggested solutions.

1. The data being received is garbled.

  1. The DTE/DCE switches are not set properly (see section 4.0, "Operation").

  2. The equipment the Model 201/207/209/221/227 is connected to does not have the same communication parameter settings as the unit.

  3. T+ and T- are reversed going to R+ and R-.

  4. One of the four wires is broken.

  5. Wires are not paired properly. - T+ and T- should be one twisted pair and R+ and R- should be the other.

2. No data is being received.

  1. The customer equipment is not connected to the Model 201/207/209/221/227.

  2. The DTE/DCE switches are not set properly (see section 4.0, "Operation").

  3. Verify that hardware handshaking (control lines) is not required.

  4. One or more wires between the modems are open. 

  5. The link connection exceeds the maximum specified distance.

3. The Data is clear at first and then becomes garbled.

  1. Verify that software handshaking (XON/XOFF) is being used.

If the unit is believed to be defective, operation can be verified if one of the devices to which the modems are attached is capable of operating in a full-duplex mode (e.g., a terminal or a PC using a communications package such as Procomm). Connect the Model 201/207/209/221/227 to the terminal via the RS-232 connector and make the following loopback connections at the analog interface:

T+ to R+ and T- to R-

If the modem is functioning correctly, any data entered on the keyboard should appear on the screen.

6.0 Connector Pin Assignments
 

6.1 Model 201/207/221/227

Pin

EIA

CCITT

Name

 

2

BA

103

Transmit Data

*

3

BB

104

Receive Data

*

4

CA

105

Request to Send

**

5

CB

106

Clear to Send

**

6

CC

107

Data Set Ready

***

7

AB

102

Signal Ground

Gnd

8

CF

109

Data Carrier Detect

***

20

CD

108.2

Data Terminal Ready

***

 

* These signals can be reversed using the selector switch.
**, *** Connected together.

 

6.2 Model 209

Pin

EIA

CCITT

Name

 

3

BA

103

Transmit Data

*

2

BB

104

Receive Data

*

7

CA

105

Request to Send

**

8

CB

106

Clear to Send

**

6

CC

107

Data Set Ready

***

5

AB

102

Signal Ground

Gnd

1

CF

109

Data Carrier Detect

***

4

CD

108.2

Data Terminal Ready

***

 

* These signals can be reversed using the selector switch
**, *** Connected together

7.0 Power

7.1 Model 201/207/221/227

This model can be powered in one of two ways:

  1. The unit attempts to derive positive power from Pins 4, 5, 6, 8 or 20 (if available) and negative power from the Data Input pin (must be at least -5.5 V in its quiescent state).

  2. If any device that the Model 201/207/221/227 is connected to does not support the control signals, all power is then derived from the data-input signal (must be at least -5.5 V in the quiescent state)

7.2 Model 209

This model can be powered in one of two ways:

  1. The unit attempts to derive positive power from Pins 1, 4, 6, 7 or 8 (if available) and negative power from the Data Input pin (must be at least -5.5 V in its quiescent state).
  2. If any device the Model 209 is connected to does not support the control signals, all power is then derived from the Data Input signal (must be at least -5.5 V in the quiescent state).

8.0 Help

If you require assistance, please visit our Technical Support Center.
 

Warranty

TELEBYTE warrants the equipment to be free from defects in material and workmanship, under normal and proper use and in its unmodified condition, for 12 months, starting on the date it is delivered for use. TELEBYTE's sole obligation under this warranty shall be to furnish parts and labor for the repair or replacement of products found by TELEBYTE to be defective in material or workmanship during the warranty period. Warranty repairs will be performed at the point of manufacture. Equipment approved for return for warranty service shall be returned F.O.B. TELEBYTE factory and will be redelivered by TELEBYTE freight prepaid, except for non-continental U.S.A. locations. Non-continental deliveries will be sent COD freight plus import/export charges.

The above warranty is in lieu of all other warranties, expressed or implied, statutory or otherwise, including any implied warranty of merchantability or fitness for a particular purpose. TELEBYTE shall not be liable for any damages sustained by reseller or any other party arising from or relating to any equipment failure, including, but not limited to consequential damages nor shall TELEBYTE have any liability for delays in replacement or repair of equipment.

Out of warranty equipment may be returned to the Greenlawn, NY customer service facility prepaid as described above. Return shipping charges will be billed to the customer. The repaired unit will have a 90-day warranty. In those cases where "NO TROUBLE" is found, a reduced charge will be billed to cover handling, testing and packaging.

Whether in or out of warranty, a Return Material Authorization (RMA) number is necessary and can be obtained by visiting our Technical Support Center. Reference the RMA number on the outside container.


Document No. 0315-0227/Rev. D
 

Model Product Info
201 Product Page  Application Note  Specifications
209 Product Page  Application Note  Specifications
221 Product Page  Application Note  Specifications
227 Product Page  Application Note  Specifications

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