Campbell Scientific COM200 User Manual

COM200 TELEPHONE MODEM

INSTRUCTION MANUAL

REVISION: 5/01

COPYRIGHT (c) 1997-2001 CAMPBELL SCIENTIFIC, INC.

This is a blank page.

Warranty and Assistance

815 W. 1800 N.
Logan, UT 84321-1784
USA
Phone [phone]
FAX [phone]
www.campbellsci.com

Campbell Scientific Canada Corp.
11564 -149th Street
Edmonton, Alberta T5M 1W7
CANADA
Phone [phone]
FAX [phone]

Campbell Scientific Ltd.
Campbell Park
80 Hathern Road
Shepshed, Loughborough
LE12 9GX, U.K.
Phone [phone]
FAX [phone]

The

COM200 TELEPHONE MODEM is warranted by CAMPBELL

SCIENTIFIC, INC. to be free from defects in materials and workmanship
under normal use and service for twelve (12) months from date of shipment
unless specified otherwise. Batteries have no warranty. CAMPBELL
SCIENTIFIC, INC.'s obligation under this warranty is limited to repairing or
replacing (at CAMPBELL SCIENTIFIC, INC.'s option) defective products.
The customer shall assume all costs of removing, reinstalling, and shipping
defective products to CAMPBELL SCIENTIFIC, INC. CAMPBELL
SCIENTIFIC, INC. will return such products by surface carrier prepaid. This
warranty shall not apply to any CAMPBELL SCIENTIFIC, INC. products
which have been subjected to modification, misuse, neglect, accidents of
nature, or shipping damage. This warranty is in lieu of all other warranties,
expressed or implied, including warranties of merchantability or fitness for a
particular purpose. CAMPBELL SCIENTIFIC, INC. is not liable for special,
indirect, incidental, or consequential damages.

Products may not be returned without prior authorization. To obtain a
Returned Materials Authorization (RMA), contact CAMPBELL SCIENTIFIC,
INC., phone [phone]. After an applications engineer determines the
nature of the problem, an RMA number will be issued. Please write this
number clearly on the outside of the shipping container. CAMPBELL
SCIENTIFIC's shipping address is:

CAMPBELL SCIENTIFIC, INC.

RMA#_____
815 West 1800 North
Logan, Utah 84321-1784

CAMPBELL SCIENTIFIC, INC. does not accept collect calls.

Non-warranty products returned for repair should be accompanied by a
purchase order to cover the repair.

This is a blank page.

COM200 Telephone Modem
Table of Contents

1. Introduction

2. Specifications

3. Installation

4. Troubleshooting

5. Modem Settings in Non-Volatile Memory

Appendixes

A. Modifying the Non-Volatile Memor y

................................................................ 1

1.1 General Description ................................................................................. 1

1.2 Computer Requirements........................................................................... 1

............................................................. 1

.................................................................. 2

3.1 Connecting to Datalogger ........................................................................2

3.2 Connecting to Earth Ground....................................................................3

3.3 Telephone to MD9 or Telephone to RF Systems..................................... 3

3.4 Telephone Service.................................................................................... 3

......................................................... 6

................. 7

......................A-1

A.1 Hardware Connection to COM200......................................................A-1

A.2 Remote Communication to the COM200............................................ A-1

A.3 Hayes at Command Summary.............................................................A-3

B. CS I/O Connection

B.1 CS I/O 9 Pin Connection..................................................................... B-1

C. Theory of Operation

C.1 Theory of Operation............................................................................ C-1

..................................................B-1

...............................................C-1

D. FCC Warning to Users of

Class A Computing Devices

E. IC Information

F. The 10704 12 V Adaptor

.........................................................E-1

..........................................F-1

i

.............................D-1

COM200 Telephone Modem Table of Contents

List of Figures

1 COM200...................................................................................................... 2

2 CR10X with CR10X Wiring Panel and COM200 Using

Remote Telephone Line ..................................................................................4

3 CR10X with CR10 Wiring Panel and COM200 Using

RJ11C Telephone Jack.................................................................................... 5

A-1 CR10X with CR10 Wiring Panel and the old COM200 Using

RJ11C Telephone Jack................................................................................A-2

A-2 COM200 to Computer Connection.....................................................A-2

B-1 CS I/O Pin Out.....................................................................................B-1

List of Tables

1 Dataloggers that Require Direct 12 VDC Connection to COM200 ............3

F-1 Dataloggers that Require Direct 12 VDC Connection to COM200..... F-1

ii

COM200 Telephone Modem

1. Introduction

1.1 General Description

The COM200 Modem is a 9600/1200 baud modem employing the Hayes AT
command set. Its primary use is as a remote site modem connected to a CSI
datalogger. The modem is powered and enabled by the battery-powered
datalogger. When not active, the COM200 draws less than 120 µA from the
datalogger’s 12 VDC output.

The COM200 is connected to a CSI datalogger by using a 9-pin subminiature
D connector cable. This is the same 9-pin CS I/O connection common to all
Campbell Scientific products. This is not an RS-232 connection. Appendix B
describes the configuration of this connector.

The COM200 can be used as an originate modem at the datalogger site. To
originate a call to the computer, the datalogger is programmed using
Instruction 97. Instruction 97 is described in detail in the datalogger manual.

1.2 Computer Requirements

2. Specifications

A Hayes compatible modem is used at the co m puter site with Campbell
Scientific computer software to call the datalogger attached to the COM200.
The computer’s modem must be configured to the proper settings using the
modem initialization strings listed in the software programs.

To communicate at 9600 baud, the calling modem’s error correction must be
enabled. If your modem initialization string has an &Q0, you will need to
change it to an &Q5 in order to enable the error correction. You must
continue to use your old string for any communication at 1200 baud.

• Bell 212A, CCITT V.22, and CCITT V.32 compatible

• Full duplex at 9600 and 1200 baud to datalogger

• V.42 LAPM and MNP2-4 error correction

• Hayes AT command set

• RJ-11C telephone jack

• FCC and IC (formally known as DOC) approval

• Pulse or tone dialing

1

COM200 Telephone Modem

CAMPBELL

SCIENTIFIC

INC.

Complies with Part 68, FCC rules. FCC Registration No. B9QUSA-31402-MM-T
Ringer Equivalence 0.6B.Required Connector USOC RJ11C. Canadian Load No. 5

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• Current drain: 120 µA quiescent, 140 mA active

• Direct connection to and powered by CSI dataloggers

• Supply requirements: 12 VDC regulated power supply

• Internally switches 12 VDC external power minimizing current drain

• Logic levels: below 1.5 V inputs a low state and above 3.5 V inputs a

high state. A low voltage level on the TX data input (pin 9) and RX data
output (pin 4) represents a mark

o

• Operational temperature: -25

C to +50oC

• Size: 5.2” x 1.7” x 3.6” // 13.1 x 4.3 x 9.2 cm

• Weight: 0.75 lbs // 0.34 kg

COM200 MODEM

12V

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3. Installation

3.1 Connecting to Datalogger

M

A

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IN

U

S

TIP

A

RING

GND

FIGURE 1. COM200

The COM200 is designed to be used with standard analog telephone lines. It
will not work with a digital telephone line. Connection to telephone company­provided coin service (central office implemented systems) is prohibited.
Connection to party line service is subject to state tariffs.

Connect the cable from the telephone RJ11C jack to the modem as shown in
Figure 3. If the telephone company has not installed surge protection in the
telephone line (no RJ11C jack), one must install surge protection (Model 6362
or 2372-01) and connect the ring and tip terminal blocks as shown in Figure 2.

Current Campbell Scientific dataloggers provide 12 VDC to the COM200 via
the SC12 cable (Figure 2). Older dataloggers do not provide 12 VDC on the
datalogger's CS I/O 9 pin connector. When used with the older dataloggers
listed in Table1, 12 VDC and ground need to be connected via the green power
connector on the side of the COM200 (see Figure 3).

2

Table 1. Dataloggers that Require Direct

12 VDC Connection to COM200

CR10(X) w/ silver wiring panel
CR10(X) w/ black CR10 wiring panel (P/N 8032)
21X(L)—serial number 13,442 or lower
CR500serial number 1764 or lower
CR7—700X serial number 2778 or lower
BDR301 and BDR320

3.2 Connecting to Earth Ground

Connect the green 14 awg grounding wire (provided with the COM200) to the
grounding terminal (GND) on the COM200 and to the enclosure’s earth
ground connection. If the site does not have a grounded enclosure, then
connect the ground wire directly to an earth ground connection. The
datalogger ground should also be tied to the earth ground.

COM200 Telephone Modem

CAUTION

The modem must be grounded for its transient protection to
work.

3.3 Telephone to MD9 or Telephone to RF Systems

Telephone to MD9 or telephone to radio systems can be utilized for
communicating with multiple dataloggers through one telephone line. Nothing
additional or special is required for the telephone part of the link. See the
MD9 or RF Manuals for complete information on their special requirements.

3.4 Telephone Service

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 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. If the telephone company requests information concerning the
equipment which you have connected to your telephone line, the FCC
registration number and the ringer equivalence number (REN) of the COM200
are listed on it’s label. Additional tech nical information from the FCC an d IC
on the COM200 is available in Appendix D and E, respectively.

3

COM200 Telephone Modem

Logan, Utah

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Complies with Part 68, FCC rules. FCC Registration No. B9QUSA-75378-MM-T
Ringer Equivalence 0.5A. Required Connector USOC RJ11C.

This equipment complies with the requirements in Part 15 of FCC Rules for Class A
computing device. Operation of this equipment in a residential area may cause
unacceptable interference to radio and TV reception requiring the operator to take
whatever steps are necessary to correct the interference.

S/N

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CAMPBELL
SCIENTIFIC
INC.

COM2 MODEM

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MADE IN USA

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Blue = Ring

Burial Phone Cable

To Earth Ground

FIGURE 2. CR10X with CR10X Wiring Panel and COM200 Using Remote Telephone Line

4

Phone Line
Transient Protector
(Model 6362 or 2372-01)

Blue/White = Tip

COM200 Telephone Modem

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Telephone Wall
Jack

FIGURE 3. CR10X with CR10 Wiring Panel and COM200 Using RJ11C Telephone Jack

5

COM200 Telephone Modem

4. Troubleshooting

When the Campbell Scientific software cannot establish a link to the remote
datalogger that is connected to the COM200, check the following:

1) Verify the modem initialization settings h ave been changed for the

2) Verify nothing else is using the same COM port on the computer. Even if

3) The Campbell Scientific software will display an activity of

specific calling modem on the computer. See software manual and/or
help screens for more information.

a program is minimized in windows, it may have a lock on the COM port.
Some notebook computers do not automatically activate the COM ports.
Verify the COM port you are using is activated.

communication as the link is being established. Assuming the above
items are O.K., the software should display in the activity window/screen
something such as “ATDT#######”. Where the #### is the telephone
number listed in the dialing path of the software for the datalogger you
are trying to call.

The local modem attached to the computer will respond back to the
computer with result codes depending on how the call is progressing.
These result codes can be either numeric (0, 1, 2, etc.) or “verbose”
(“OK”, “CONNECT”, “RING”, etc.). Our software expects numeric
result codes. The result codes may appear on a new line, be appended to
the last line, or may even replace the first letter(s) of the last line. If these
characters are verbose, the initialization string for the modem will need to
be changed. Appendix A has a list of possible result codes. The result
code returned may indicate why the call is unsuccessful.

4) Can you attach a normal analog telephone to the line and make a call out?
If not, contact your local telephone company. If you can make a call out
but the connection is poor or faint, contact your local telephone company.

5) Verify the COM200 is receiving 12 VDC. If the COM200 is receiving 12
VDC from a separate power supply instead of the datalogger, is the
ground of the separate power supply connected to the datalogger’s
ground?

6) Verify the COM200 is the only Modem Enable device connected to the
datalogger. Other common Campbell Scientific modem enable devices
are the SC32A, some RF modems, and the MD9.

7) Verify the datalogger is turned on.

6

COM200 Telephone Modem

To comply with FCC Rules and Regulations, all repairs on the COM200
modem must be performed by Campbell Scientific, Inc. or an authorized agent
of Campbell Scientific, Inc. For assistance in installation, troubleshooting, or
for repair, contact Campbell Scientif ic:

Campbell Scientific, Inc.
815 West 1800 North
Logan, Utah 84321-1784
Telephone: [phone]
Fax: [phone]
Web site: www.campbellsci.com

5. Modem Settings in Non-Volatile Memory

The COM200 comes from the factory with the appropriate settings for most
applications. It is programmed to answer the call as soon as it detects the call.

One may modify the COM200’s settings in non-volatile memory using Hayes
AT commands. Appendix A describes the procedures and commands required
to make the changes described in this section.

Some of the settings one may change are:

Disable auto-answer: This option is used only when the modem is not to
answer a call. For example, the COM200 is connected to a telephone line
which is to be used part time for voice communication. In this situation it is
best to have the datalogger call the computer.

Answer on X

th

ring: This option is used when the modem is sharing a line and

you only want it to answer after a specified number of rings. For example, the
COM200 is sharing a line with people at an office. It can be programmed to
only answer after the 4

th

ring. When the people know the call is for the weather
station, they will not pickup the telephone, and after 4 rings, the datalogger
will pick it up.

Change telephone system types: Change from the Bell 212A (U.S. and
Canada) system to a CCITT V.32 (foreign, 9600 baud) or CCITT V.22
(foreign, 1200 baud) system. This does not mean that the COM200 is tested
and approved for all foreign countries.

CCITT is an international consultative com mittee that sets international
communications usage standards. V.32 and V.22 are standards that the
COM200 meets.

7

COM200 Telephone Modem

This is a blank page.

8

Appendix A. Modifying the Non-Volatile Memory

To modify the COM200’s settings, one must communicate directly to the
COM200. This may be accomplished by using one of the two methods below.

CAUTION

Changing some of the modem's settings may result in
communication problems. After changing the settings, tr y
the modem locally before installing it at a remote location.

A.1 Hardware Connection to COM200

Connect the COM200 to a computer using an SC532 interface (Figure A-1).
COM200s prior to S/N 2334 require the 10704 adaptor as shown in Figure A-

2. The computer software (PC208W) used to communicate with the COM200
must set the RS232 RTS line low.

For example, to change the COM200 to answer on the 3
commands would be sent to the COM200 through the PC208W terminal
emulator (RTS not active on modem hardware configuration):

ATS0=3
AT&W0

rd

A.2 Remote Communication to the COM200

To remotely communicate with the COM200, program the datalogger to
initiate a call to it using a program similar to the Example Program 1.* After
this program runs once, the modem is now programmed and the actual
program one wants to run may now be downloaded to the datalogger.

ring, the following

*Please note that this program requires that the option code for an RF modem
be used instead of the normal phone modem option.

A-1

Appendix A. Modifying the Non-Volatile Memory

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Adaptor

Appendix A. Modifying the Non-Volatile Memory

Example Program 1

*Table 1 Program

01: 1 Execution Interval (seconds)

1: Initiate Telecommunications (P97)

1: 02 RF Modem/9600 Baud
2: 1 Disabled when User Flag 1 is High
3: 20 Seconds Call Time Limit
4: 0 Seconds Before Fast Retry
5: 0 Fast Retries
6: 0 Minutes before Slow Retry
7: 1 Failures Loc [ Failure ]
8: 0 Data Logger ID

2: Extended Parameters (P63)

1: 65 Option ;A
2: 84 Option ;T
3: 83 Option ;S
4: 48 Option ;0
5: 61 Option ;=
6: 51 Option ;3
7: 38 Option ;&
8: 87 Option ;W

3: Extended Parameters (P63)

1: 48 Option ;0
2: 68 Option ;D
3: 84 Option ;T
4: 13 Option
5: 00 Option
6: 00 Option
7: 00 Option
8: 00 Option

A.3 Hayes AT Command Summary

This manual does not attempt to be a primer on the Hayes AT command set.
The commands are, therefore, only summarized below. For most applications,
these commands will not need to be used. Except as n oted, all commands
should begin with an “AT” and end with a carriage return (hit the [Enter]
key). There are no “O” as in Oscar commands, only “0” as in Zero
commands. All commands must be issu ed as CAPITAL letters.

A-3

Appendix A. Modifying the Non-Volatile Memory

COMMANDS TO CHANGE DEFAULT MODES:

B1 (default) CCITT V.32 (9600 baud), Bell 212A (1200 baud), and Bell

103 (300 baud)

B0 CCITT V.32 (9600 baud), CCITT V.22 (1200 baud), and

CCITT V.21 (300 baud)

S0=0 Disable Auto Answer
S0=1 Answer on first ring
S0=2 Answer on second ring
S0=X Answer on X

&F Restore factory defaults
&W0 Store current profile as Profile to lo ad on power up
&V Display the current profile to the screen

RESULT CODES:
0 OK

1 Connect
2Ring
3No Carrier
4Error
5 Connect 1200 Baud
6 No Dial Tone
7Busy
8No Answer
12 Connect 9600 Baud
13 Connect 9600/14400 Baud
17 Connect 9600 Baud

th

ring. (X is a number; maximum number = 4)

CAUTION

If more than four rings are specified, the datalogger may
time out before the modem answers; communication will
never be established! It is possible in some conditions to
allow more than four rings. Consult a Campbell Scientific
applications engineer about optimizing modem negotiations
before trying this and be sure to try the set up locally before
installing at a remote location.

A-4

Appendix B. CS I/O Connection

B.1 CS I/O 9-Pin Connection

The pin out of the connector is shown in Figure B-1. The direction of the
signal relative to the modem is shown in parenthesis. Unless specified
otherwise, all levels are 0 V for logic low, 5 V for logic high.

FIGURE B-1. CS I/O Pin Out

1. (input) +5 VDC supply. Not used by COM200.

2. (input) Ground

3. (output) Ring - a logic high signifies a ring signal has been detected

4. (output) RX Data - serial data from COM200

5. (input) Modem Enable - a logic high internally switches power to the

modem. A logic low internally shuts off power to the modem.

6. (input) Serial Device Enable - a logic high disables communication with

the modem without removing power or changing the modem's mode.

7. (input) SDC clock. Not used by COM200.

8. (input) +12 VDC supply

9. (input) TX Data - serial data to COM200

B-1

This is a blank page.

Appendix C. Theory of Operation

C.1 Theory of Operation

The COM200 modem is used to transmit data over bandwidth-limited channels
such as telephone lines by modulating audio tones, using Phase Shift Keying
(PSK) at 9600 or 1200 baud and Frequency Shift Keying (FSK) at 300 baud.

The telephone company gives a 40 to 150 VRMS, 20 Hz signal on the
telephone lines to signify a ring, which is typically on for 2 seconds and off for
4 seconds. The ring detection circuitry is continuously powered but draws less

than 2 µA. The ring signal is passed on to the datalogger through an opto­coupler. The datalogger responds by raising the Modem Enable line which
internally switches the 12 VDC power to the modem . The modem then
answers and remains off-hook until it loses the carrier or the datalogger lowers
the Modem Enable line. The datalogger lowers the Modem Enable line by
remote command or after 40 seconds in the absence of a command. When the
Modem Enable line goes low, it internally remove s the 12 VDC power from
the modem circuitry, dropping power to the off-hook relay and thus placing the
telephone line on-hook.

To reject noise common to both telephone lines and to satisfy registration
requirements, the modem circuitry is electrically isolated from the telephone
lines by using an opto-isolator and coupling transformer.

C-1

This is a blank page.

Appendix D. FCC Warning to Users of Class A Computing Devices

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 J of Part 15 of
FCC Rules, which are designed to provide reasonable
protection against such int erference when operated in
a COMMERCIAL ENVIRONMENT. Operation of this
equipment in a residential area may cause int erference
to radio and television reception. The operator must
take whatever measures are necessary to correct the
interference.

D-1

This is a blank page.

Appendix E. IC Information

NOTE

Industry Canada (IC) was formally known as DOC.

CP-01, Issue 8, Part I
Section 14.1

“NOTICE: The Industry Canada label identifies certified equipment. This
certification means that the equipment meets certain telecommunications
network protective, operational and safety requirements as prescribed in the
appropriate Terminal Equipment Technical Requirements document(s). The
Department does not guarantee th e equipment will operate to the user’s
satisfaction.

“Before installing this equipment, users should ensure that it is permissible to
be connected to the facilities of the local telecom m unications company. The
equipment must also be installed using an acceptable method of connection.
The customer should be aware that compliance with the above conditions may
not prevent degradation of service in some situations.

“Repairs to certified equipment should be coordinated by a representative
designated by the supplier. Any repairs or alterations made by the user to this
equipment, or equipment malfunctions, may give the telecommunications
company cause to request the user to disconnect the equipment.

“Users should ensure for their own protection that the electrical ground
connections of the power utility, telephone lines and internal metallic water
pipe system, if present, are connected together. This precaution may be
particularly important in rur al areas.

CAUTION

Users should not attempt to make such connections
themselves, but should contact the appropriate electric
inspection authority, or electrician, as appropriate.”

CP-01, Issue 8, Part I
Section 14.2

“NOTICE: The Ringer Equivalence Number (REN) assigned to each terminal
device provides an indication of the maximum number of terminals allowed to
be connected to a telephone interface. The termination on an interface may
consist of any combination of devices subject only to the requirement that the
sum of the Ringer Equivalence Numbers of all the devices does not exceed 5.”

E-1

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Appendix F. The 10704 12 V Adaptor

COM200s prior to serial number 2334 require a part number 10704 adaptor to
connect 12 volts directly to the modem.

The 10704 adaptor is used between the SC12 cable and the datalogger (Figure
F-1). Table F-1 lists the Campbell Scientific dataloggers that do not supply 12
VDC on the 9 pin connector and hence require a direct 12 VDC connection to
the COM200. When using the 10704 adaptor, the red and black wires should
be connected to 12 V and Ground, respectively. The female connector of the
10704 should be connected to the COM200 while the male connector goes to
the datalogger.

Table F-1. Dataloggers that Require

Direct 12 VDC Connection to COM200

CR10(X) w/ silver wiring panel
CR10(X) w/ black CR10 wiring panel (P/N 8032)
21X(L)—serial number 13,442 or lower
CR500serial number 1764 or lower
CR7—700X serial number 2778 or lower
BDR301 and BDR320

DIFFSEAG H L AG H L AG H L AG GGE3 AG

4 5 6

78 910 1112

12 34 56

SE

1 2 3

AG H L AG H L AG H L AG GGE1 E2

DIFF

To Earth

Ground

14 AWG Ground Wire

C

A

M

P

B

E

L

L

S

C

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N

T

IF

C

IC

O

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2

0

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ith

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com

puting device. Operation of this equepment in a residential area m

unacceptable interference to radio and TV reception requiring the operator to take

w

h

ate

ve

r step

s a

re n

S

/N

1002

O

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8

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f

F

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ay cause

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nce

.

M

ADE IN USA

F

EARTH

-M

M

-T

a

d

N

o

.

5

r

C

l

a

s

s

A

TIP

RING

GND

12V 12V

GGGG

G5V5VP1P2 C8C7C6C5C4C3C2C1

SWITCHED

12V

SWITCHED
CONTROL

G 12V

POWER

IN

1

MADE IN USA

WIRING PANEL NO.

12V

Red

(+12v)

10704 Adaptor

SERIAL I/O

Black

(Ground)

SC12 Cable

Telephone Wall
Jack

FIGURE F-1. CR10X with CR10 Wiring Panel and COM200 Using

RJ11C Telephone Jack

F-1

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