Campbell SC932A Bedienungsanleitung

INSTRUCTION MANUAL

SC932A 9-Pin to

RS-232-DCE Interface

Revision: 2/04

Campbell Scientific, Inc.

Warranty and Assistance

The SC932A 9-PIN TO RS-232-DCE INTERFACE 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. The following

contact information is for US and International customers residing in countries

served by Campbell Scientific, Inc. directly. Affiliate companies handle repairs

for customers within their territories. Please visit www.campbellsci.com to

determine which Campbell Scientific company serves your country. To obtain

a Returned Materials Authorization (RMA), contact CAMPBELL

SCIENTIFIC, INC., phone (435) 753-2342. 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.

SC932A Table of Contents

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

2. Specifications .............................................................2

3. Installation...................................................................3

4. RAD Modem Application............................................3

4.1 RAD Modem - Two Way..........................................................................4

4.2 RAD Modem Wiring and Grounding........................................................4

4.3 Testing RAD Modem Communication .....................................................6

Figures

1. SC932A 9-Pin to RS-232-DCE Interface....................................................1

2. Two Way Communication..........................................................................4

3. Installation of Spark Gap Protection...........................................................5

Table

1. Approximate Range, miles and km.............................................................4

This is a blank page.

SC932A 9-Pin to RS-232-DCE Interface

Datalogger

DCEDevice

SN:

SC932A

MadeinUSA

CAMPBELL

SCIENTIFIC,INC.

Logan,Utah

FIGURE 1. SC932A 9-Pin to RS-232-DCE Interface

1. General Description

The SC932A (Figure 1) is used to interface a CSI datalogger to any modem that

is configured with an RS-232 DCE (Data Communications Equipment) serial

port. Features include:

•True RS-232 signal levels.

•Power for the SC932A is supplied from the 5 V supply on pin 1 of the

datalogger’s I/O port. The SC932A will use the 5 V supply to power the

RS-232 modem if needed.

•Two way (interactive) communication.

The SC932A is frequently used with a short haul modem to communicate

across a dedicated line made of 2 pairs of twisted wire with a shield. Section 3

describes the details of this application using a short haul modem built by RAD.

The SC932A is also commonly used with the satellite transmitters, cellular

modems, and spread spectrum radios.

The SC932A does not support one way output or printer communication. Data

transfer is blocked when pin 6 from the datalogger is high (SDE/printer enable).

SC932A 9-Pin to RS-232-DCE Interface

2. Specifications

RS-232 9-Pin Male Connector Pin-out:

Pin No. I/O Name Description

1 In DCD Data Carrier Detect (No Connection)

2 In RXD Received Data

3 Out TXD Transmitted Data

4 Out DTR Data Terminal Ready (5 V Supply from CS I/O)

5 GND Signal Ground

6 In DSR Data Set Ready (No Connection)

7 Out RTS Request to Send – Modem Enable

8 In CTS Clear to Send (No Connection)

9 In Ring Rings Datalogger

CS I/O 9-Pin Male Connector Pin-out:

Pin No. I/O Name Description

1 in +5V Regulated 5 Volt supply

2 GND Ground

3 out RING Ring signal to datalogger

4 out RXD SC932A transmits on this line

5 in ME Modem Enable—must be high for transfer

6 in SDE Synchronous Device Enable—data blocked when high

9 in TXD SC932A receives on this line

Data Rates

The SC932A will support baud rates up to 115,200 bps.

SC932A 9-Pin to RS-232-DCE Interface

Electrical

The SC932A uses power from the +5 V line on the 9-pin interface connected to

the datalogger.

Additional current (up to 10 mA) from the 5 V supply may be used by the RS-

232 device connected to the SC932A.

Physical

Height: 0.9 in (2.3 cm)

Width: 1.6 in (4.1 cm)

Length: 3 in (7.6 cm)

Weight: 1.6 oz (45.4 g)

Environmental

Temperature: -25 to +50oC

Humidity: up to 95% non-condensing

3. Installation

Connect the SC932A to the RS-232 device and to the datalogger with the SC12

9-pin cable (included). If the device has a 25-pin connector, a 9-pin female to

25-pin male adaptor is required (CSI PN 15751).

Proper transient protection should be installed to protect the computer and

datalogger in areas where damage due to lightning is possible. If this is a RAD

modem application, see Section 4.2.

4. RAD Modem Application

The SC932A is frequently used with a short range modem to communicate

across a 4-wire, unconditioned dedicated line. Campbell Scientific offers a kit

(PN 15770) that includes the SC932A, the 9- to 25-pin adaptor (PN 15751),

and a mounting bracket (PN 6282). The bracket will mount the RAD, SC932A

and adaptor to the back plate in a Campbell Scientific enclosure. This section

describes using a short range asynchronous modem built by RAD*.

* SRM - 5A RAD Modem

RAD Data Communications Inc.

900 Corporate Drive

Mahwah, NJ 07430

Tel: (201) 529-1100

Fax: (201) 529-5777

Email: market@radusa.com

http://www.rad.com

For transmission, the RAD modem uses a cable made of 2 pairs of twisted

wires with a shield. Data rates up to 9600 bps are possible. The low voltage

transmission levels minimize cross-talk between adjacent lines within the same

cable. Data are transmitted and received at a balanced impedance, providing

SC932A 9-Pin to RS-232-DCE Interface

excellent immunity to circuit noise. Table 1 gives the data rate possible for

several gage cables across several distances.

TABLE 1. Approximate Range, miles and km

Data Rate 19 Gauge (0.9 mm) 24 Gauge (0.5 mm) 26 Gauge (0.4 mm)

bps miles km miles km miles km

9,600 6.2 10.0 2.8 4.5 2.0 3.3

1,200 7.6 12.2 3.4 5.5 2.5 4.0

4.1 RAD Modem - Two Way

4-WIRE UNCONDITIONED

TELEPHONE LINE

TWO TWISTED PAIRS SRM 9 TO 25 PIN

ADAPTOR SC932A DATALOGGERPC SRM

FIGURE 2. Two Way Communication

When using Campbell Scientific’s datalogger support software to communicate

through the SC932/RAD modem, “Setup” the link as a direct connect between

the datalogger and the desired COM port. Start two way communication using

the “Connect” button on the Tool bar and the “Connect” button in the

“Connect” window.

4.2 RAD Modem Wiring and Grounding

Figure 3 shows a typical setup of the RAD modems. Installation is as follows:

1. Set the DCE/DTE switch on the back of the RAD modem connected to the

SC932A to DCE. For a RAD modem connected to a PC, set the

DCE/DTE switch to DCE. For a RAD modem connected to a serial

printer, set the DCE/DTE switch to DTE.

2. Select a cable with two or more twisted pairs. A recommended direct

burial rodent resistant cable is listed below. They also sell several gopher

resistant cables for even greater protection.

Company Part Number AWG.

Anixter F-02P22BPN 22

Tel: 847-677-2600

http://www.anixter.com

3. Wiring connections are made as shown in Figure 3. Note wires labeled A

and B are one twisted pair of the cable. Wires labeled C and D are the

other twisted pair.

4. Transients induced on the communication line may damage any

electronics connected at either end of the line. To decrease the chances

for damage, spark gaps should be installed as shown in Figure 3. The

transient protection shown may be purchased from Campbell Scientific,

Inc. (p.n. 5563 shown in Figure 3, p.n. 6536 includes a plastic case, p.n.

SC932A 9-Pin to RS-232-DCE Interface

6361 includes hardware for mounting to ground lug of CSI enclosures

models ENC 10/12, ENC 12/14, or ENC 16/18). Spark gap wiring is

straight through such that pin to pin continuity exists between the two

modems. If the modems are installed entirely within a building, the

transient spark gap protection is probably not needed.

FIGURE 3. Installation of Spark Gap Protection

SC932A 9-Pin to RS-232-DCE Interface

Occasionally a customer needs to transmit data across longer or smaller gage

wires or at higher speeds than can be done with the RAD modem powered by

the SC932A. RAD does sell a 9 volt power supply that will boost the signals

enough to meet some of these more demanding applications. Please contact

RAD for more information.

4.3 Testing RAD Modem Communication

The modem communication link is divided into the following three sections: 1)

RAD modem computer end, 2) cable from computer modem to datalogger

modem, 3) RAD modem datalogger end. When unable to establish

communication with the datalogger, test each of the three sections.

Before proceeding through the testing procedures, a terminal emulator software

program such as HyperTerminal or Campbell Scientific’s datalogger support

software (Test Terminal Emulator) must be used to communicate through the

COM port of the computer. Once the emulator program is set up, testing can

proceed as follows:

1. Disconnect the 4 conductor cables from the SRM-6A RAD modem at the

computer end. Jumper the XMT + to RCV + and jumper the XMT - to

RCV -. This creates a transmit loop which allows any key pressed at the

computer keyboard to be seen on the screen. If the key pressed is not

seen, check the following: COM port configuration, 25-pin cable from the

computer to the modem and the RAD modem.

2. Reconnect the 4 conductor cables to the modem at the computer end and

disconnect the cable from the modem at the datalogger end. Twist

together the XMT + wire and RCV + wire, twist together the XMT - wire

and the RCV - wire. Repeat the process of step 1 by pressing a key on the

computer keyboard. If the key pressed is not returned, then the cable from

the modem at the computer to the datalogger modem is defective and will

need to be repaired or replaced.

3. If steps 1 and 2 pass, the modem at the datalogger is suspect. Disconnect

the modem from the SC932A and bring the modem to the computer site.

Attach the modem to the computer, and repeat step 1 by jumpering the

terminals of the modem and pressing a key on the computer keyboard.

If the above tests pass and communication to the datalogger still has not been

established, perform tests 4, 5, and 6.

4. A 12 V lead acid battery supply should not be discharged below 11.76 V.

If this occurs, the batteries will go into a deep discharge state and will

need to be replaced. The CR10 will function properly on a battery voltage

of 10 to 15 volts. Check the 12 V supply with a volt meter.

5. On the wiring panel of most Campbell Scientific dataloggers there is a

terminal marked 5 V. Check the 5 V supply with a volt meter. This 5 V

supply should be within a tenth of a volt. If not, it would indicate a

problem.

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