Fluke 1521 8 Communications Interface

8 Communications Interface

Remote communications allowsan external device, such as a computer, to com-

municatewith the 1521 to obtain measurement data and control its operation.

Communication is accomplished with variouscommands issued to the 1521

through theRS-232 serial port.

8.1 RS-232 Connection

The three-conductor jack for theserial port is located on the top of the 1521

near the probe connector.One serial cable is included with the 1521. Additional

or longer cables,of three meters or less, can be constructed by following the

wiringdiagram shown in Figure 8. Note: The TxD line on one side connects

to the RxD line on the other and vice-versa.To reduce the possibility of elec-

tricalinterference, the serial cable should be shielded with low resistance be-

tween theconnector and the shield. It should not be much longer than is

necessary.The protocol for serial communications is 8 data bits, 1 stop bit, and

no parity.Use no flow control. The baud rate is fixed at 2400, the linefeed to

37

8 Communications Interface

RS-232 Connection

1

2

3

4

5

6

7

8

9

RxD

TxD

GND

RxD

TxD

GND

Figure8 RS-232 Wiring

Contents

Main Rev. 571203 Table of Contents 7 Display Functions. . . . . . . . . . . . . . . . . . . . . . . . . 25 8 Communications Interface. . . . . . . . . . . . . . . . . . . . 37 9 Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 10 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 Page Figures and Tables 1 Before You Start 1.1 Symbols Used 1.2 Safety Information 1.2.1 Warnings 1.2.2 Cautions 1.3 Authorized Service Centers Page 2 Introduction 3 Specifications and Environmental Conditions 3.1 Specifications 9 3 Specifications and Environmental Conditions Specifications 3.2 Environmental Conditions 4 Quick Start 4.1 Unpacking 4.2 Use Proper Care with the 1521 and Accessories 4.3 Learn About the Features and Components 4.4 Connect the Probe 4.5 Connect the Power Source 4.6 Switch the Power On 4.7 Measure Temperature Page Page 5.2 Top and Side Features 5.3 Back Features 5.4 Internal Features 5.5 Accessories Page 6 General Operation 6.1 Battery 6.2 DC Power Source + 6.3 Power Button 6.4 Display and Backlight 6.5 Probe 6.6 INFO-CON Connector 1521 Handheld Thermometer Readout Figure6 Probe Wiring Diagrams 24 7 Display Functions Each of these operating modes is described in the sections that follow. 7.1 Blank Mode This mode is identified by Blank that temporarily appears on the display. 7.2 Min/Max Mode 7.3 Hold Mode 7.4 Delta(x) Mode 7.5 Units 7.6 Rate 7.7 Resolution 7.8 CAL MODE 7.8.1 Mtr Due 7.8.2 Prb Due 7.8.3 Time 7.8.4 Passcode 7.8.5 Date 7.8.6 Probe Lock 7.8.7 Prb # 7.8.8 Prb Type 7.8.9 ITS-90 7.8.10 IEC751 7.8.11 CVD 7.8.12 YSI-400 7.8.13 THERM 7.8.14 Probe Wires 7.8.15 PCal 7.8.16 PDue 7.8.17 Filter 7.8.18 MCal 7.8.19 MDue 7.8.20 CAL1 and CAL2 8 Communications Interface 8.1 RS-232 Connection 8.2 Communication Command List 8.2.1 Primary Commands 8.2.2 Calibration Commands 39 8 Communications Interface Communication Command List Page Page 9 Calibration 9.1 Required Equipment 9.2 Calibration Procedure Page 10 Maintenance 11 Troubleshooting 11.1 An Error Message Is Displayed The followingtable lists possible error messages, their causes, and suggested actions. 47 11 Troubleshooting An Error Message Is Displayed 11.2 CE Comments 11.2.1 EMC Directive 11.2.2 Low Voltage Directive (Safety)