Remote Automation Solutions Bristol 1200 bps Modems Owner's manual

CI-1200

Issue: 08/2002

BBI 1200 bps

PL & PSTN

MODEMS

BBI 1200 bps

PL & PSTN

MODEMS

Instruction Manual

Bristol Babcock

J6

1

J1

RX

DS7

RX

DS7

P1

TB1

CTS

DS8

CTS

DS8

DTR

DS9

DTR

DS9

CD

DS12

CD

DS12

PWR

DS10

PWR

DS10

TX

U2

W6

P2

1

2

3

4

5

6

7

8

9

10

J3

{

DS6

9

5

6

1

J3

Modem Interface Board

J1

Modem Board

NOTICE

Copyright Notice

The information in this document is subject to change without notice. Every effort has been

made to supply complete and accurate information. However, Bristol Babcock assumes no

responsibility for any errors that may appear in this document.

Request for Additional Instructions

Additional copies of instruction manuals may be ordered from the address below per

attention of the Sales Order Processing Department. List the instruction book numbers or

give complete model number, serial or software version number. Furnish a return address

that includes the name of the person who will receive the material. Billing for extra copies

will be according to current pricing schedules.

TELETRANS

TM

and SMARTKIT

TM

are trademarks of Bristol Babcock. Other trademarks or

copy-righted products mentioned in this document are for information only, and belong to

their respective companies, or trademark holders.

No part of this manual may be reproduced in any form without the express written

permission of Bristol Babcock.

IMPORTANT! READ INSTRUCTIONS BEFORE STARTING!

Be sure that these instructions are carefully read and understood before any

operation is attempted. Improper use of this device in some applications may result

in damage or injury. The user is urged to keep this book filed in a convenient location

for future reference.

These instructions may not cover all details or variations in equipment or cover

every possible situation to be met in connection with installation, operation or

maintenance. Should problems arise that are not covered sufficiently in the text, the

purchaser is advised to contact Bristol Babcock for further information.

EQUIPMENT APPLICATION WARNING

The customer should note that a failure of this instrument or system, for

whatever reason, may leave an operating process without protection. Depending

upon the application, this could result in possible damage to property or injury to

persons. It is suggested that the purchaser review the need for additional backup

equipment or provide alternate means of protection such as alarm devices, output

limiting, fail-safe valves, relief valves, emergency shutoffs, emergency switches, etc.

If additional information is required, the purchaser is advised to contact Bristol

Babcock.

RETURNED EQUIPMENT WARNING

When returning any equipment to Bristol Babcock for repairs or evaluation,

please note the following: The party sending such materials is responsible to ensure

that the materials returned to Bristol Babcock are clean to safe levels, as such levels

are defined and/or determined by applicable federal, state and/or local law regulations

or codes. Such party agrees to indemnify Bristol Babcock and save Bristol Babcock

harmless from any liability or damage which Bristol Babcock may incur or suffer due

to such party’s failure to so act.

ELECTRICAL GROUNDING

Metal enclosures and exposed metal parts of electrical instruments must be

grounded in accordance with OSHA rules and regulations pertaining to "Design

Safety Standards for Electrical Systems," 29 CFR, Part 1910, Subpart S, dated: April

16, 1981 (OSHA rulings are in agreement with the National Electrical Code).

The grounding requirement is also applicable to mechanical or pneumatic

instruments that include electrically-operated devices such as lights, switches, relays,

alarms, or chart drives.

EQUIPMENT DAMAGE FROM ELECTROSTATIC DISCHARGE VOLTAGE

This product contains sensitive electronic components that can be damaged by

exposure to an electrostatic discharge (ESD) voltage. Depending on the magnitude

and duration of the ESD, this can result in erratic operation or complete failure of the

equipment. Read BBI supplemental document S14006 for proper care and handling

of ESD-sensitive components.

Bristol Babcock 1100 Buckingham Street, Watertown, CT 06795

Telephone (860) 945-2200

WARRANTY

A. Bristol warrants that goods described herein and manufactured by Bristol are free

from defects in material and workmanship for one year from the date of shipment

unless otherwise agreed to by Bristol in writing.

B. Bristol warrants that goods repaired by it pursuant to the warranty are free from

defects in material and workmanship for a period to the end of the original warranty

or ninety (90) days from the date of delivery of repaired goods, whichever is longer.

C. Warranties on goods sold by, but not manufactured by Bristol are expressly limited

to the terms of the warranties given by the manufacturer of such goods.

D. All warranties are terminated in the event that the goods or systems or any part

thereof are (i) misused, abused or otherwise damaged, (ii) repaired, altered or

modified without Bristol’s consent, (iii) not installed, maintained and operated in

strict compliance with instructions furnished by Bristol, or (iv) worn, injured or

damaged from abnormal or abusive use in service time.

E. THESE WARRANTIES ARE EXPRESSLY IN LIEU OF ALL OTHER

WARRANTIES EXPRESS OR IMPLIED (INCLUDING WITHOUT LIMITATION

WARRANTIES AS TO MERCHANTABILITY AND FITNESS FOR A PARTICULAR

PURPOSE), AND NO WARRANTIES, EXPRESS OR IMPLIED, NOR ANY

REPRESENTATIONS, PROMISES, OR STATEMENTS HAVE BEEN MADE BY

BRISTOL UNLESS ENDORSED HEREIN IN WRITING. FURTHER, THERE ARE

NO WARRANTIES WHICH EXTEND BEYOND THE DESCRIPTION OF THE

FACE HEREOF.

F. No agent of Bristol is authorized to assume any liability for it or to make any written

or oral warranties beyond those set forth herein.

REMEDIES

A. Buyer’s sole remedy for breach of any warranty is limited exclusively to repair or

replacement without cost to Buyer of any goods or parts found by Seller to be

defective if Buyer notifies Bristol in writing of the alleged defect within ten (10) days

of discovery of the alleged defect and within the warranty period stated above, and if

the Buyer returns such goods to Bristol’s Watertown office, unless Bristol’s Water-

town office designates a different location, transportation prepaid, within thirty (30)

days of the sending of such notification and which upon examination by Bristol

proves to be defective in material and workmanship. Bristol is not responsible for

any costs of removal, dismantling or reinstallation of allegedly defective or defective

goods. If a Buyer does not wish to ship the product back to Bristol, the Buyer can

arrange to have a Bristol service person come to the site. The Service person’s

transportation time and expenses will be for the account of the Buyer. However,

labor for warranty work during normal working hours is not chargeable.

B. Under no circumstances will Bristol be liable for incidental or consequential damages

resulting from breach of any agreement relating to items included in this quotation

from use of the information herein or from the purchase or use by Buyer, its

employees or other parties of goods sold under said agreement.

How to return material for Repair or Exchange

Before a product can be returned to Bristol Babcock for repair, upgrade, exchange, or to

verify proper operation, form (GBU 13.01) must be completed in order to obtain a RA

(Return Authorization) number and thus ensure an optimal lead time. Completing the form

is very important since the information permits the Bristol Babcock Repair Dept. to

effectively and efficiently process the repair order.

You can easily obtain a RA number by:

A. FAX

Completing the form (GBU 13.01) and faxing it to (860) 945-3875. A BBI Repair

Dept. representative will return call (or other requested method) with a RA number.

B. E-MAIL

Accessing the form (GBU 13.01) via the Bristol Babcock Web site

(www.bristolbabcock.com) and sending it via E-Mail to [email protected]

.

A BBI Repair Dept. representative will return E-Mail (or other requested method)

with a RA number.

C. Mail

Mail the form (GBU 13.01) to

Bristol Babcock Inc.

Repair Dept.

1100 Buckingham Street

Watertown, CT 06795

A BBI Repair Dept. representative will return call (or other requested method) with

a RA number.

D. Phone

Calling the BBI Repair Department at (860) 945-2442. A BBI Repair Department

representative will record a RA number on the form and complete Part I, then send

the form to the Customer via fax (or other requested method) for Customer

completion of Parts II & III.

A copy of the completed Repair Authorization Form with issued RA number should be in-

cluded with the product being returned. This will allow us to quickly track, repair, and

return your product to you.

&VMWXSP&EFGSGO-RG6ITEMV%YXLSVM^EXMSR*SVQ

(Providing this information will permit BBI to effectively and efficiently process your return. Completion is required to

receive optimal lead time. Lack of information may result in increased lead times.)

Date___________________ RA #___________________SH_ Line No.____________

Form GBU 13.01 Rev. A

Standard Repair Practice is as follows: Variations to this is

practice may be requested in the “Special Requests” section.

• Evaluate / Test / Verify Discrepancy

• Repair / Replace / etc. in accordance with this form

• Return to Customer

Please be aware of the Non warranty standard charge:

• There is a $100 minimum evaluation charge, which is

applied to the repair if applicable (√ in “returned” B,C,

or D of part III below)

Part I Please complete the following information for single unit or multiple unit returns

Address No. (office use only) Address No. (office use only)

Bill to : Ship to:

Purchase Order: Contact Name:____________________________________

Phone: Fax: E-Mail:

Part II Please complete Parts II & III for each unit returned

Model No./Part No. Description

Range/Calibration S/N

Reason for return :

Failure Upgrade Verify Operation Other

1. Describe the conditions of the failure (Frequency/Intermittent, Physical Damage, Environmental Conditions,

Communication, CPU watchdog, etc.)

(Attach a separate sheet if necessary)

2. Comm. interface used:

Standalone RS-485 Ethernet Modem (PLM (2W or 4W) or SNW) Other:______________

3. What is the Firmware revision? _____________________ What is the Software &version?

Part III If checking “replaced” for any question below, check an alternate option if replacement is not available

A. If product is within the warranty time period but is excluded due

to BBI’s warranty clause, would you like the product:

repaired returned replaced scrapped?

B. If product were found to exceed the warranty period,

would you like the product:

repaired returned replaced scrapped?

C. If product is deemed not repairable would you like your product:

returned replaced scrapped?

D. If BBI is unable to verify the discrepancy, would you like the product:

returned replaced *see below?

* Continue investigating by contacting the customer to learn more about the problem experienced? The person to contact that

has the most knowledge of the problem is: _______________________________ phone

If we are unable to contact this person the backup person is: _________________________

phone

Special Requests:

Ship prepaid to: Bristol Babcock Inc., Repair Dept., 1100 Buckingham Street, Watertown, CT 06795

Phone: 860-945-2442 Fax: 860-945-3875

Bristol Babcock

Training

GET THE MOST FROM YOUR BRISTOL

BABCOCK INSTRUMENT OR SYSTEM

· Avoid Delays and problems in getting your system on-line

· Minimize installation, start-up and maintenance costs.

· Make the most effective use of our hardware and software.

· Know your system.

As you know, a well-trained staff is essential to your operation. Bristol Babcock offers a full

schedule of classes conducted by full-time, professional instructors. Classes are offered

throughout the year at four locations: Houston, Los Angeles, Orlando and our Watertown,

CT headquarters. By participating in our training, your personnel can learn how to install,

calibrate, configure, program and maintain any and all Bristol Babcock products and realize

the full potential of your system.

For information or to enroll in any class, contact our training department in Watertown at

(860) 945-2343. For Houston classes, you can also contact our Houston office, at (713) 685-

6200. For Los Angeles classes, you can contact our Ontario, CA office at (909) 923-8488.

BLANK PAGE

A Few Words About Bristol Babcock

For over 100 years, Bristol

7

has been providing innovative solutions for the measurement

and control industry. Our product lines range from simple analog chart recorders, to

sophisticated digital remote process controllers and flow computers, all the way to turnkey

SCADA systems. Over the years, we have become a leading supplier to the electronic gas

measurement, water purification, and wastewater treatment industries.

On off-shore oil platforms, on natural gas pipelines, and maybe even at your local water

company, there are Bristol Babcock instruments, controllers, and systems running year-in

and year-out to provide accurate and timely data to our customers.

Getting Additional Information

In addition to the information contained in this manual, you may receive additional assis-

tance in using this product from the following sources:

Contacting Bristol Babcock Directly

Bristol Babcock's world headquarters are located at 1100 Buckingham Street, Watertown,

Connecticut 06795, U.S.A.

Our main phone numbers are:

(860) 945-2200

(860) 945-2213 (FAX)

Regular office hours are Monday through Friday, 8:00AM to 4:30PM Eastern Time,

excluding holidays and scheduled factory shutdowns. During other hours, callers may leave

messages using Bristol's voice mail system.

Telephone Support - Technical Questions

During regular business hours, Bristol Babcock's Application Support Group can provide

telephone support for your technical questions.

For technical questions regarding Bristol hardware products call (860) 945-2502.

For technical questions regarding software products such as ACCOL Tools, Open BSI

products, or UOI call (860) 945-2286.

For technical questions regarding Bristol's Enterprise Server

7

and Enterprise Workstation

7

products, call (860) 945-2286. For technical questions regarding Bristol's OpenEnterprise

product, call (860) 945-2501 or e-mail openenterprise@bristolbabcock.com

You can e-mail the Application Support Group at: [email protected]

The Application Support Group also maintains a service area within our main web site.

Technical information, as well as software updates are available in this area. To access our

web site, go to: bristolbabcock.com/services/techsupport/

For assistance in interfacing Bristol Babcock hardware to radios, contact Communication

Technologies in Orlando, FL at (407) 629-9463 or (407) 629-9464.

Telephone Support - Non-Technical Questions, Product Orders, etc.

Questions of a non-technical nature (product orders, literature requests, price and delivery

information, etc.) should be directed to the nearest sales office (listed below) or to your

Bristol-authorized sales representative.

Major U.S. Sales Offices Major International Sales Offices:

Watertown, CT (860) 945-2262 Bristol Babcock Ltd (UK): (441) 562-820-001

Birmingham, AL (205) 980-2010 Bristol of Canada: (416) 675-3820

Ontario, CA (909) 923-8488 Bristol Babcock Asia Pacific 61 8-9455-9955

Farmington, NM (505) 327-3271 BBI, S.A. de C.V. (Mexico) (52555) 254-5281

Houston, TX (713) 685-6200

Richardson, TX (972) 238-8935

Please call the main Bristol Babcock number (860-945-2200) if you are unsure which office

covers your particular area.

Visit our Site on the World Wide Web

For general information about Bristol Babcock and its products, please visit our site on the

World Wide Web at: www.bristolbabcock.com

1200 bps Modems Contents / 0-1

CI-1200

BBI 1200 bps

PL & PSTN MODEMS

TABLE OF CONTENTS

SECTION TITLE PAGE #

1 FEATURES ................................................................. 1

2 DESCRIPTION ............................................................... 1

2.1 Modem Component Identification ............................................... 3

2.1.1 Modem Interface Connectors ................................................... 7

2.2 Communication Terms ....................................................... 11

3 PC CONFIGURABLE OPTIONS ................................................ 11

3.1 Listing Of Configurable Options ................................................ 11

3.1.1 RTS/CTS Delays ............................................................ 11

3.1.1.1 Purpose of RTS/CTS Delay .................................................... 12

3.1.1.2 Considerations for RTS/CTS Delay ............................................. 12

3.1.2 Constant Carrier (2W/4W Private Mode only) .................................... 12

3.1.3 RTS Antistreaming Timer .................................................... 12

3.1.4 Send long Space ............................................................. 12

3.1.5 Long Space Disconnect ....................................................... 12

3.1.6 Calling Party Disconnect ..................................................... 13

3.1.7 PSTN Time Limit ........................................................... 13

3.1.8 Auto Answer (Number of Rings to Auto-answer) ................................. 13

3.1.9 Redial (Auto-dial Delay) ...................................................... 13

3.1.10 No RTS .................................................................... 13

3.1.11 Private Line Output Level ..................................................... 13

4 STATUS LEDS .............................................................. 13

5 FIELD WIRING ............................................................. 14

5.1 PSTN Hookup (Public Lines) .................................................. 14

5.2 Two-Wire Private Line Network ............................................... 15

5.3 Four-Wire Private Line Network ............................................... 16

5.4 Point-to-Point Wiring ........................................................ 17

5.4.1 Two-Wire Point-to-Point System ............................................... 17

5.4.2 Four-Wire Point-to-Point System ................................................ 17

5.5 Networks With Two Branches ................................................. 18

5.6 Radio Communications ....................................................... 18

6 MODEM SETUP PROCEDURES ............................................... 19

6.1 Configuration for Basic PSTN ................................................. 19

6.2 Configuration for Private Line & Radio ......................................... 24

6.3 Lightning Arresters .......................................................... 28

7 DIAGNOSTICS .............................................................. 29

8 SPECIFICATIONS ........................................................... 29

8.1 Operating Specifications ..................................................... 29

8.2 Environmental Specifications ................................................. 30

Addendums

1200 bps MODEMS PROGRAMMING/COMMAND GUIDE .................................Addendum 1

USING SMARTKIT TO CONFIGURE THE BBI 1200 bps TELETRANS MODEM ..............Addendum 2

BLANK PAGE

CI-1200 BBI 1200 bps Modems / 1

SECTION 1 - FEATURES

· Bell 202/212 compatibility at fixed rate of 1200 bps

· Switched Network and 2-wire/4-wire Private Line capability

· Auto Dial/Auto Answer in Bell 212 Switched Network mode

· Smart programming based on the Hayes command set

· Storage of all parameters in non-volatile memory

· Available Versions:

1200 bps TELETRANS Modem (Not Field Retrofitable)

1200 bps DPC 3310/3330 Modem

1200 bps DPC 3335 Modem

1200 bps RTU 3305 Modem

1200 bps Panel Mount Modem (used with 3530-55B TeleRecorder)

1200 bps PC Mount Modem

SECTION 2 - DESCRIPTION

1200 bps Modems transmit and receive digital data over "Private Line" (PL) or "Public

Switched Telephone Networks" (PSTN). The modem transfers data asynchronously and

operates half duplex on two-wire and four-wire private lines, and operates full duplex on

either four-wire private lines or switched networks. The modem supports both Bell 212 and

Bell 202 modulation schemes.

A typical example of where these modems are used in a PSTN is shown in Figure 1 (also see

Figure 10). This network contains four Bristol Babcock Distributed Controllers equipped

with 1200-bps modems operating in a master/slave configuration. During operation, the

master controller dials up and communicates with each slave (remote) at prescribed

intervals to send and receive data. The interval of dialing is a function of the application

software that is executed by the master device.

When configured for private line operation, the modem may be operated over 2 or 4-wire

point-to-point (see Figures 13 and 14) or multidropped networks (see Figures 2, 11, 12 and

15).

The modem operates at 1200 bps (the selected speed is compatible with the following com-

unication standards:

Table 1 - Standards for PL & PSTN Networks

Compatible With

Standards

Comm.

Mode

Pvt. Line

Wiring

PSTN

Wiring

Bell 212* Full Duplex N/A 2-Wire

Bell 202* or

CCITT V.23

Half Duplex or

Full Dyplex

2-Wire or

4-Wire

N/A

The modem's transmitter output, as measured with 600-ohm termination (typical for

telephone lines) is as follows:

2 / BBI 1200 bps Modems CI-1200

Private Line @ 1200 BPS (2 or 4-wire) = 0 or -9 dBm (Selectable)

PSTN Line @ 1200 BPS (2-wire) = -9 dBm (Fixed)

The modem presents a -9 dBm output level to the PSTN. This qualifies the modem for use

with any voice grade PSTN hookup in compliance with FCC "permissive arrangement"

requirements.

Figure 1 - Typical 1200 bps Modem Network

(Using PSTN Lines)

CI-1200 BBI 1200 bps Modems / 3

Figure 2 - Private Line Multidrop Network

2.1 Modem Component Identification

The areas of the modem discussed in this text are highlighted in Figures 3 through 10.

· Up to Six LEDs, provide status information as follows: Transmit Data (DS1/DS6 - TXD),

Receive Data (DS2/DS7- RXD), Clear To Send (DS3/DS8 - CTS), Data Terminal Ready

(DS4/DS9 - DTR), Power (DS5/DS10 - Enable LEDs) and Carrier Detect (DS11/DS12).

· Interconnection components include:

- Terminal block (TB1) for Radio or PL phone interface connection (all versions of the

modem).

- Connector for the PSTN (J1).

- A 10-pin header (P1) that plugs into the host device for all versions except the PC

Modem, Panel Mount Modem and the RTU 3305 Modem.

4 / BBI 1200 bps Modems CI-1200

- A 9-pin D-Type connector (J5, or J6) for modem configuration and J4 for modem

communications interface. J6 is provided with DPC 3310 and 3330 models. J5 is

provided with the DPC 3335 and the RTU 3305. J4 is provided with the PC Mount and

Panel Mount versions of the modem.

- Terminal block (TB2) (10-Pin on the RTU 3305 Modem, 3-Pin on the PC Mount and

Panel Mount versions). Serves as Radio or PL phone interface connector for the 1200

bps RTU 3305 Modem. Pins 8, 9, and 10 provide an RS-232 Configuration Port for PC,

Panel Mount and RTU 3305 versions of the 1200 bps Modem.

- Terminal block (TB3) provides an 8-Pin TTL (Data/Dial) interface between the RTU

3305 and the Modem.

- Power terminal (TB4) provides screw mount terminals (+12/24Vdc and ground) for the

Panel Mount version of the modem.

- Power Jack (J2) is provided on the PC Mount version of the modem along with a

+12Vdc Regulated Power Supply (P/N 395480-01-9) or Power Cable (P/N 396302-01-7).

· Power ON/OFF Switch SW1 for PC Mount and Panel Mount versions of the modem.

Figure 3 - 1200 bps DPC 3310/3330 Modem Component Identification

CI-1200 BBI 1200 bps Modems / 5

· Except for the 3508 Pressure Transmitter (which only utilizes the circular TELETRANS

Modem Board), the modem is comprised of a two board set, i.e., the circular

TELETRANS Modem Board and the rectangular 1200 bps Modem Interface Board.

These boards are interfaced via connectors P2 and J3. Note that the circular

TELETRANS Modem does not have LEDs.

Figure4 - 1200 bps DPC 3335 Modem Component Identification

Figure 5 - 1200 bps Panel Mount Modem Component Identification

6 / BBI 1200 bps Modems CI-1200

Figure 6 - 1200 bps PC Mount Modem Assembly (End Views)

Figure 7 - 1200 bps PC Mount Modem Bd. Component Identification

CI-1200 BBI 1200 bps Modems / 7

Figure 8 - 1200 bps RTU 3305 Modem Component Identification

 Configuration components include:

- Jumper W6 on the Modem Interface Board - Installed enables the LEDs.

- RTS/CTS Jumper (No #) (available on 392946-XX-X Modem Boards only) - Installed in

position 1-2, enables RTS/CTS Loopback. - Installed in position 2-3, disables RTS/CTS

loopback. Note: The RTS/CTS Loopback Jumper (see Figure 9) must be instal-

led in position 1-2 whenever the BBI 1200 bps Modem is communicating with a

Hayes compatible modem manufactured/supplied by other than BBI.

Figure 9 - Modem Component Identification - Edge View

2.1.1 Modem Interface Connectors

Modem Interface Board Connectors provide routing for power and ground and all signals

that flow between the host device/system (such as a DPC 3330) and the modem, PL/PSTN

line and modem, or a PC connected to the modem. The tables that follow provide interface

information. All I/O is referenced with respect to the Modem Interface Board.

8 / BBI 1200 bps Modems CI-1200

Table 2 - Private Line/Radio Interface Connector - TB1

TB1 Pin # Signal Name Description Input/Output

1 T/R_1 (P/L) Transmit/Receive Private Line I/O

2 T/R_2 (P/L) Transmit/Receive Private Line I/O

3 R_1 (P/L) Receive Private Line 4-Wire I

4 R_2 (P/L) Receive Private Line 4-Wire I

5 KEY-GND Ground ---

6 KEY Radio Key Signal O

Table 3 - TB2

RTU 3305 Private Line/Radio or RS-232 Config. Port Connector

PC Mount & Panel Mount RS-232 Config. Port Connector (Pins 8, 9 & 10)

TB2 Pin # Signal Name Description Input/Output

1 T/R_1 (P/L) Transmit/Receive Private Line I/O

2 T/R_2 (P/L) Transmit/Receive Private Line I/O

3 R_1 (P/L) Receive Private Line 4-Wire I

4 R_2 (P/L Receive Private Line 4-Wire I

5 KEY-GND Ground ---

6 KEY Radio Key Signal O

7 KEY-GND Ground ---

8 TXD2 Transmit Data (RS-232) O

9 RXD2 Receive Data (RS-232) I

10 KEY-GND Ground (RS-232) ---

Note: Pins 1 through 10 are only available on 1200 bps RTU 3305 Modems. Pins 8, 9

and 10 are used (factory) to place the modem into "CLASSIC Mode." All

versions of the modem operate in CLASSIC Mode except the TELETRANS

Modem (which operates in "TELETRANS Mode"). Pins 8, 9 and 10 also provide

the programming interface for 1200 bps Panel Mount and PC Mount versions of

the modem and may be used in lieu of connector J5 for programming the 1200

bps RTU 3305 Modem.

Table 4 - 1200 bps RTU 3305 Modem Interface (Dial/Data) Connector - TB3

TB3 Pin # Signal Name Description Input/Output

1+5Vdc +5Vdc I

2 TTL_TXD1A Transmit Data I

3 TTL_RTS1A Request to Send (NOT) I

4 TTL_DTR1A Data Terminal Ready (NOT) I

5 TTL_RXD1 Receive Data O

6 TTL_CTS Clear to Send (NOT) O

8 MDM_PWR +12/24 Vdc I

Table 5 - Panel Mount Modem Power Connector - TB4

TB4 Pin # Signal Name Description Input/Output

1 Bulk Power 12/24 Vdc Input Supply I

2 GND Input Power Ground I

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Remote Automation Solutions Bristol 1200 bps Modems Owner's manual

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