Patton electronics 2085 Manuale utente

USER

MANUAL

SALES OFFICE

(301) 975-1000

TECHNICAL SUPPORT

(301) 975-1007

http://www.patton.com

Part# 07M2085-D

Doc# 047033UD

Revised 4/15/97

MODEL 2085

High Speed RS-232

to RS-485 Interface

Converter

CERTIFIED

An ISO-9001

Certified Company

1.0 WARRANTY INFORMATION

Patton Electronics warrants all Model 2085 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 2085 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. The Model 2085 has been tested and found to

comply with the limits for a Class A computing device in accordance

with the specifications in Subpart J of Part 15 of FCC rules, which are

designed to provide reasonable protection from such interference in a

commercial installation. However, there is no guarantee that

interference will not occur in a particular installation. If the Model 2085

does cause interference to radio or television reception, which can be

determined by disconnecting the RS-232 interface, 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 CE NOTICE

The CE symbol on your Patton Electronics equipment indicates

that it is in compliance with the Electromagnetic Compatibility (EMC)

directive and the Low Voltage Directive (LVD) of the Union European

(EU). A Certificate of Compliance is available by contacting Technical

Support.

1.3 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: (301) 975-1007, http://www.patton.com;

[email protected].

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 2085. 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 Technical Support at (301) 975-1007.

2.1 FEATURES

• Operates asynchronously, point to point or multipoint,

over 2 or 4 wires

• Up to 50 multipoint device drops in a polling environment

• Data rates to 115.2 Kbps

• Passes transmit & receive data, one control signal each direction

• No AC power or batteries are required

• Variable high/low impedance settings

• Able to operate with or without “echo”

• Carrier can be set as “constantly on” or “controlled by RTS”

• Compact size ( 2.66” x 2.10” x 0.73”)

• Twisted pair connection via strain relief, RJ-11 or RJ-45

• Silicon Avalanche Diode surge protection

2.2 DESCRIPTION

The Model 2085 High Speed RS-232 to RS-485 Interface

Converter provides exceptional versatility in a compact package.

Requiring no AC power or batteries for operation, the Model 2085

supports asynchronous RS-232 data rates to 115.2 Kbps over one or

two unconditioned twisted pair.

The Model 2085 passes one control signal in each direction and

can handle up to 50 terminal drops in a multipoint polling environment.

The Model 2085 may be configured for high or low impedance

operation, carrier may be set to “constantly on” or “controlled by RTS”,

and the unit can operate with or without “echo”. RTS/CTS delay may

be set for “no delay” or 8 mS.

The Model 2085 is equipped with either male or female DB-25 for

RS-232 connection. Options for twisted pair connection include

terminal blocks with strain relief, RJ-11, RJ-45 and DB-25 male or

female. Silicon Avalanche Diodes provide 600 watts per wire of

protection against harmful data line transient surges.

3.0 CONFIGURATION

The Model 2085 is configured using an eight position DIP switch

and a DCE/DTE switch. Figure 1 (below) shows the location of the

DCE/DTE switch (externally accessible) on the PC board, as well as

the power supply daughter board and terminal block.

Figure 2 (below) shows the location of the eight position DIP switch

on the underside of the Model 2085 PC board. Figure 3 (following

page) shows the orientation of the eight position DIP switch, with

respect to ON/OFF positions.

+RCV- G -XMT+

DCE/DTE

Switch

Terminal

Block

Figure 1. Top view of Model 2085 board, showing DCE/DTE switch.

12345678

DIP Switch

Figure 2. Bottom view of Model 2085 board, showing (internal) DIP switch.

3.1 SETTING THE DCE/DTE SWITCH

For your convenience, the Model 2085 has an externally

accessible DCE/DTE switch. If the device connected to the Model

2085 is a modem or multiplexer (or is wired like one), set the switch to

“DTE”. This setting causes the Model 2085 to behave like Data

Terminal Equipment and transmit data on pin 2. If the device

connected to the Model 2085 is a PC, terminal or host computer (or is

wired like one), set the switch to “DCE”. This setting causes the Model

2085 to behave like Data Communications Equipment and transmit

data on pin 3.

3.2 DIP SWITCH CONFIGURATION

The eight switches on switch set S1 (see Figure 3, above)

configure the Model 2085 for echo mode, carrier control method,

RTS/CTS delay, “transmit off” impedance, receive impedance, and 2-

wire/4-wire operation. These switches are located

internally

on the

Model 2085's PC board. To access switch set S1, use a small flat

blade screwdriver to pop open the Model 2085's case as shown in

Figure 4, below.

3.3 DIP SWITCH SETTINGS

All possible settings for the Model 2085’s configuration switches

are presented in Figure 5 (below). Following Figure 5 is a detailed

description of each switch function. If you have additional questions,

contact Technical Support at (301) 975-1000.

*Note: Switches S1-1 & S1-2 should be switched simultaneously.

Switches S1-7 & S1-8 should also be switched simultaneously.

S1-1 and S1-2: “Transmit Off” Impedance

Switches S1-1 and S1-2 are set together to determine whether the

receiving device “sees” the impedance of the Model 2085’s transmitter

as being “high” or “intermediate” when the transmitter is turned off. The

“intermediate” setting is useful in half-duplex environments where the

receiving device does not respond well to the “high” setting.

S1-1 S1-2 Setting

On On Intermediate Impedance

Off Off High Impedance

S1-3: RTS/CTS Delay

The setting for switch S1-3 determines the amount of delay

between the time the Model 2085 “sees” RTS and when it sends CTS.

Note: RTS/CTS Delay setting should be based upon transmission

timing.

S1-3 Setting

On 8 mSec

Off no delay

S1 SUMMARY TABLE

Position Function Factory Default

S1-1* “Transmit Off” Impedance Off

S1-2* “Transmit Off” Impedance Off

S1-3 RTS/CTS Delay On 8 msec

S1-4 “ECHO” Mode Off Echo Off

S1-5 Carrier Control On RTS Cont.

S1-6 Receive Impedance On 120 Ohm

S1-7* 2-Wire/4-Wire On

S1-8* 2-Wire/4-Wire On

High Z

2-Wire

}

Figure 5. Summary of DIP switch default settings for set S1

}

Figure 4. Opening the Model 2085's plastic case with a small screwdriver

Figure 3. Close-up of DIP switch showing “ON” and “OFF” positions

12345678

OFF

3.4 CONFIGURATION SWITCH APPLICATIONS

The switch settings

generally

needed to configure the Model 2085

for various applications are shown in the table below. Note: Do not

change switch settings until you have

carefully

read Section 3.3.

S1-4: Echo Mode

The setting for switch S1-4 determines whether the Model 2085

echoes data back to the transmitting device (half-duplex mode only).

S1-4 Setting

On Echo On

Off Echo Off

S1-5: Carrier Control Method

The setting for switch S1-5 determines whether the carrier is

“Constantly On” or “Controlled by RTS”. This setting allows for

operation in switched carrier, multipoint and/or hardware handshaking

applications.

S1-5 Setting

On Controlled by RTS

Off Constantly On

S1-6: Receive Impedance

The setting for switch S1-6 selects the impedance of the input

receiver. You may select either a “low” impedance of 120 Ohms or a

“high” impedance of 16 kOhms. By selecting the proper impedance for

each drop, there may be up to 50 receivers in one application.

S1-6 Setting

On Low (120 Ohm)

Off High (16 kOhm typical)

S1-7 and S1-8: 2-Wire/4-Wire Modes

Switches S1-7 and S1-8 are set together to determine whether the

Model 2085 is in 2-wire or 4-wire operating mode. Note: 2-wire mode

is half-duplex only.

S1-7 S1-8 Setting

On On 2-wire mode

Off Off 4-wire mode

7 8

S1-1: “Xmt Off” Imp. OFF OFF OFF OFF OFF

S1-2: “Xmt Off” Imp. OFF OFF OFF OFF OFF

S1-3: RTS/CTS Delay ON ON ON OFF ON

S1-4: Echo OFF OFF OFF OFF OFF

S1-5: Carrier Control OFF ON ON Master-OFF ON

Slaves-ON

S1-6: Rcv Impedance ON ON ON Master - ON

Slaves - OFF

Last Slave - ON

S1-7: 2-wire/4-wire OFF OFF ON OFF ON

S1-8: 2-wire/4-wire OFF OFF ON OFF ON

TYPICAL MODEL 2085 APPLICATIONS

Point-to-Point

Switch

Settings Multi-point

4W 2W 4W 2W4W HDX

4.0 INSTALLATION

Once you have properly set the configuration switches, you are

ready to connect the Model 2085 to your system. This section tells you

how to properly connect the Model 2085 to the RS-485 and RS-232

interfaces, and how to operate the Model 2085.

4.1 CONNECTION TO THE RS-485 INTERFACE

To function properly, the Model 2085

must

have one or two twisted

pairs of metallic wire. These pairs must be "dry" (unconditioned)

metallic wire, between 19 and 26 AWG (the higher number gauges may

limit distance somewhat).

For your convenience, the Model 2085 is available with several

different physical interfaces on the RS-485 side: DB-25 (following the

RS-520 standard), RJ-11 jack, RJ-45 jack, and terminal blocks with

strain relief.

4.1.1 4-WIRE CONNECTION USING THE DB-25

The DB-25 connector on the Model 2085's RS-485 side conforms to

the RS-530 interface standard. When connecting to an RS-485 device

that also conforms to the RS-530 standard, your cable should be

"crossed over" in the manner shown below:

MODEL 2085 RS-485 (530) DEVICE

SIGNAL DB-25 PIN DB-25 PIN SIGNAL

XMT+ 2...........................3 RCV+

XMT- 14...........................16 RCV-

RCV+ 3...........................2 XMT+

RCV- 16...........................14 XMT-

NOTE: It is not necessary that the RS-485 device adhere to the RS-530

standard. However, you must make sure that the signals, polarities, and pairing

of your connection conform to the above diagram.

4.1.2 4-WIRE CONNECTION USING RJ-11 OR RJ-45

The RJ-11 and RJ-45 connectors on the Model 2085's RS-485 side

are pre-wired for a standard TELCO wiring environment. The signal/pin

relationships are shown below:

RJ-11 SIGNAL RJ-45 SIGNAL

1...................GND* 1 .................N/C

2...................RCV- 2 .................GND*

3...................XMT+ 3 .................RCV-

4...................XMT- 4 .................XMT+

5...................RCV+ 5 .................XMT-

6...................GND 6 .................RCV+

7 .................GND

8 .................N/C

*Connection to ground is optional

In most modular RS-485 applications it is necessary to use a "cross

over" cable. The diagram below shows how a cross over cable should

be constructed for an environment where both the Model 2085 and the

RS-485 device use a 6-wire RJ-11 connector. Similar logic should be

followed when using RJ-45 connectors or a combination of the two.

MODEL 2085 RS-485 DEVICE

SIGNAL PIN# PIN# RS-422 SIGNAL

GND†1 -------------------N/C

RCV- 2 -------------------4 XMT-

XMT+ 3 -------------------5 RCV+

XMT- 4 -------------------2 RCV-

RCV+ 5 -------------------3 XMT+

GND†6 -------------------N/C

9 10

4.1.3 4-WIRE CONNECTION USING TERMINAL BLOCKS

If your RS-485 application requires you to connect two pairs of bare

wires to the Model 2085, you will need to open the case to access the

terminal blocks. The following instructions will tell you how to open the

case, connect the bare wires to the terminal blocks, and fasten the

strain relief collar in place so that the wires won't pull loose.

1. You should already have the case open for the configuration

procedure. If not, open the case according to the diagram in Section

3.2.

2. Strip the outer insulation from the twisted pairs about one inch

from the end.

3. Strip back the insulation on each of the 2 twisted pair wires

about .25".

4. Connect

one pair

of wires to XMT+ and XMT- (transmit positive

and negative) on the terminal block, making careful note of which color

is positive, and which color is negative.

5. Connect the

other pair

of wires to RCV+ and RCV- (receive

positive and negative) on the terminal block, again making careful note

of which color is positive, and which color is negative.

Ultimately, you will want to construct a two pair cross over cable that

makes a connection with the RS-485 device as shown below:

Model 2085 RS-485 Device

XMT+.............................RCV+

XMT-..............................RCV-

RCV+.............................XMT+

RCV-..............................XMT-

6. If there is a shield around the telephone cable, it may be

connected to "G" on the terminal block. We recommend connecting the

shield at the computer end only to avoid ground loops. A ground wire is

not necessary

for proper operation of the Model 2085.

7. When you finish connecting the wires to the terminal block, the

assembly should resemble the diagram below:

8. Place the 2 halves of the strain relief assembly on either side of

the telephone wire and press together very lightly. Slide the assembly

so that it is about 2 inches from the terminal posts and press together

firmly. If your cable diameter is too small or too large for our strain

relief, please contact our technical support. We have strain relief

assemblies to accommodate most cable diameters.

(continued)

+RCV- G -XMT+

11 12

9. Insert the strain relief assembly with the wire going through it

into the slot in the bottom half of the modem case and set it into the

recess in the case.

10. BEND the top half of the case as necessary to place it over the

strain relief assembly. Do not snap the case together yet.

11. Insert one captive screw through a saddle washer and then

insert the captive screw with the washer on it, through the hole in the

DB-25 end of the case. Snap that side of the case closed. Repeat the

process for the other side. This completes the cable installation

process.

4.1.4 2-WIRE CONNECTION

Most RS-485 devices employ a two-wire, half duplex configuration.

When using this configuration, be sure to first set the Model 2085 to

"two wire" mode—then use

only the transmit (XMT) pair

as shown on

the following page.

2085 SIGNAL RS-485 SIGNAL

XMT+....................................+

XMT-.....................................-

The above wiring pattern applies regardless of whether you are

making the RS-485 connection via DB-25, RJ-11, RJ-45 or terminal

blocks. For specific wiring instructions, please refer to the previous

pages of Section 4.

4.2 WIRING FOR MULTIPOINT CIRCUITS

The Model 2085 supports multi-point applications using either a

star or daisy chain topology. Both topologies require special wiring, as

well as specific DIP switch settings for master and slave units. Note:

Refer to Section 3.2.2 for multipoint DIP switch settings.

4.2.1 STAR TOPOLOGY

Using a star topology, you may connect several Model 2085s

together in a master/slave arrangement. Maximum distance between

the units will vary based upon the number of drops, data rate, wire

gauge, etc. Call Technical Support for specific distance estimates.

Figure 7 (below) shows how to wire the two-pair cables properly for

a Model 2085 star topology. Note that the ground connection is not

needed.

13 14

HOST FIRST SLAVE SECOND SLAVE

XMT+ RCV+ RCV+

XMT- RCV- RCV-

RCV+ XMT+ XMT+

RCV- XMT- XMT-

Figure 7. Star wiring for Model 2085 host and slaves

4.2.2 DAISY CHAIN TOPOLOGY

Using a daisy chain topology, you may connect several Model

2085s together in a master/slave arrangement. Maximum distance

between the units will vary based upon the number of drops, data rate,

wire gauge, etc. Call Technical Support for specific distance estimates.

Figure 8 (below) shows how to wire the two-pair cables properly for

a Model 2085 daisy chain topology. Note that the ground connection is

not needed.

4.3 CONNECTION TO THE RS-232 INTERFACE

Once you have properly configured the Model 2085 and connected

the twisted pair wires correctly, simply plug the Model 2085 directly into

the DB-25 port of the RS-232 device. Remember to insert and tighten

the two captive connector screws.

(Note: If you must use a cable to connect the Model 2085 to the

RS-232 device, make sure it is a

straight through

cable of the shortest

possible length—we recommend 6 feet or less).

4.4 OPERATING THE MODEL 2085

Once the Model 2085 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. All data signals from the RS-232 and RS-485

interfaces are passed straight through. Additionally, one hardware flow

control signal is passed

in each direction

APPENDIX A

PATTON MODEL 2085 SPECIFICATIONS

Transmission

Format: Asynchronous

Data Rate: Up to 115,200 bps

Range: Up to 9 miles

RS-232 Interface: DB-25, male or female (DCE/DTE

switchable)

RS-485 Interface

Options: DB-25, male or female; RJ-11 or RJ-45 jack;

terminal block with strain relief

Transmit Line: 2, 4 wire unconditioned twisted pair

Transmit Mode: 4-wire, full or half duplex; 2-wire half duplex

Control Signals: DSR turns “ON” immediately after the

terminal raises DTR; DCD turns “ON” after

recognizing the receive signal from the line;

CTS turns “ON” after the terminal raises

RTS.

RTS/CTS Delay: 8 mSec or “no delay”

Carrier: The carrier is switch selected either

continuous operation or switched operation,

controlled by RTS

Surge Protection: 600W power dissipation at 1 mS

Power: Draws operating power from RS-232 data

and control signals; no AC power or

batteries required.

Temperature: 0 to 50º C

Humidity: 5 to 95%, non-condensing

Size: 2.66” x 2.10” x 0.73”

15 16

HOST FIRST SLAVE OTHER SLAVE(S)

XMT+---------------------RCV+-----------------------RCV+

XMT- ---------------------RCV- -----------------------RCV-

RCV+---------------------XMT+-----------------------XMT+

RCV- ---------------------XMT- -----------------------XMT-

Figure 8. Daisy chain wiring for Model 2085 host and slaves

APPENDIX B

PATTON MODEL 2085 RS-232 PIN CONFIGURATIONS

Patton Electronics Company

1- (FG) Frame Ground

2- (TD) Transmit Data To Model 2085

3- (RD) Receive Data From Model 2085

4- (RTS) Request to Send To Model 2085

5- (CTS) Clear to Send From Model 2085

6- (DSR) Data Set Ready From Model 2085

7- (SG) Signal Ground

8- (DCD) Data Carrier Detect From Model 2085

To Model 2085 Data Term. Ready (DTR) - 20

DIRECTION “DCE” SETTING DIRECTION

1- (FG) Frame Ground

2- (TD) Transmit Data From Model 2085

3- (RD) Receive Data To Model 2085

4- (RTS) Request to Send From Model 2085

5- (CTS) Clear to Send To Model 2085

6- (DSR) Data Set Ready To Model 2085

7- (SG) Signal Ground

8- (DCD) Data Carrier Detect To Model 2085

From Model 2085 Data Term. Ready (DTR) - 20

DIRECTION “DTE” SETTING DIRECTION

Dear Valued Customer,

Thank you for purchasing Patton Electronics products! We do appreciate

your business. I trust that you find this user manual helpful.

We manufacture one of the widest selections of data communications

products in the world including CSU/DSU's, network termination units,

powered and self-powered short range modems, fiber optic modems, interface

converters, baluns, electronic data switches, data-line surge protectors,

multiplexers, transceivers, hubs, print servers and much more. We produce

these products at our Gaithersburg, MD, USA, facility, and can custom

manufacture products for your unique needs.

We would like to hear from you. Please contact us in any of the following

ways to tell us how you like this product and how we can meet your product

needs today and in the future.

Web: http://www.patton.com

Sales E-mail: [email protected]

Support E-mail: [email protected]

Phone - Sales (301) 975-1000

Phone - Support (301) 975-1007

Fax: (301) 869-9293

Mail: Patton Electronics Company

7622 Rickenbacker Drive

Gaithersburg, MD 20879 USA

We are committed to a quality product at a quality price. Patton

Electronics is BABT and ISO 9001 certified. We meet and exceed the highest

standards in the industry (CE, UL, etc.).

It is our business to serve you. If you are not satisfied with any aspect of

this product or the service provided from Patton Electronics or its distributors,

please let us know.

Thank you.

Burton A.Patton

Vice President

P.S. Please tell us where you purchased this product.

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