Fluke 1502A-156 Product Manual - Page 24

7.1.1

Setting the Baud Rate

The 1502A must be set to the same baud rate as the remote device. The baud

rate of the 1502A can be set to 1200, 2400, 4800, or 9600. The default is

2400. The baud rate is set in the

Comm

menu. Press the

Menu

button

(“

SEt?

” appears) then press the

K/Comm

button. The display will briefly indi-

cate “

SErIAL

”, then “

bAUd

” and then display the current baud rate. Use the

U

and

D

buttons to increase or decrease the baud rate then press

Enter

. The

next parameter in the

Comm

menu, the serial sample period, will then appear.

7.1.2

Automatic Transmission of Measurements

The 1502A can be programmed to automatically send measurements to a re-

mote printer or terminal. The transmission interval is set using the “

SA PEr

”

sample period parameter. This is set in the

Comm

menu after the baud rate

parameter. The display will briefly indicate “

SA PEr

” and then display the cur-

rent sample period. The sample period is specified in hours, minutes, and sec-

onds. Setting the sample period to 0 disables automatic transmission of

measurements. Use the

L

and

R

buttons to move between digits. The se-

lected digit will flash. Use the

U

and

D

buttons to increase or decrease the

digit. When the sample period is set as desired press

Enter.

The sample period can also be set using the “

SA

” communications command.

The period can be specified in seconds, in minutes and seconds, or in hours,

minutes, and seconds. For example, SA=15<EOS> causes the 1502A to

transmit measurements at 15-second intervals. SA=10:00<EOS> causes the

1502A to transmit a measurement every ten minutes. SA=2:00:00<EOS>

causes the 1502A to transmit a measurement every two hours. (<EOS> repre-

sents the termination character which is either a linefeed or carriage return).

7.1.3

Time Stamp and System Clock

The 1502A has a built-in system clock that counts hours, minutes, and sec-

onds while the power is on. The clock can be used to time stamp measure-

ment data read from the communications interfaces. When the power is

switched on the clock is set to 00:00:00. You can set the clock to show the ac-

tual time-of-day. This can be done within the

Comm

menu. Press the

Menu

button (“

SEt?

” appears) and then the

Comm

menu button. The display will

briefly show “

CLOC

” then the current clock time in hours, minutes, and sec-

onds. The time is represented in 24-hour format with 00 hours meaning 12:00

a.m. and 23 hours meaning 11:00 p.m. Use the

L

and

R

buttons to move

between digits. The selected digit will flash. Use the

U

and

D

buttons to

change the digit. Once the digits are correct, press

Enter

to accept the new

time. If you decide not to change the time press the

Exit

button instead.

The clock can also be set using the “CL” communications command:

CL=hh:mm:ss <EOS>.

The time stamp allows you to record the time-of-day with measurements that

are printed or transmitted to a computer. The given time is the value of the

system clock at the time of transmission. An example of time-stamped read-

ings is shown below.

t:

31.787 F 14:04:40

24

Manual Rev. 952801

Hart Scientific

7

Digital Communications Interface

Shop for Fluke products online at:

1.888.610.7664

www.

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.com

Section	Page
Ta ble of Con tents	3
1 In tro duc tion 1	6
2 Spec i fi ca tions and En vi ron men tal Con di tions 3	7
2.1 Spec i fi ca tions 3	7
2.2 En vi ron men tal Con di tions 4	8
2.3 War ranty 4	8
3 Safety Guide lines 7	9
4 Quick Start 9	10
4.1 Un packing 9	10
4.2 Power 9	10
4.3 Con necting the Probe 9	10
4.4 DC Power Op tion 10	11
5 Parts and Con trols 13	13
5.1 Front Panel But tons 13	13
5.2 Rear Panel 14	14
6 Gen eral Op er a tion 15	15
6.1 Se lecting Units 15	15
6.2 Pa ram e ter Menus 15	15
6.3 Menu Lock out 15	15
6.4 Se lecting the Probe Char ac ter iza tion 17	17
6.4.1 Set ting the Probe Char ac ter iza tion Type 17	17
6.4.2 Set ting the Char ac ter iza tion Co ef fi cients 17	17
6.4.3 ITS-90 PRT and Co ef fi cients 18	18
6.4.4 Callendar-Van Dusen (RTD) Con ver sion 20	20
6.4.5 IPTS-68 Con ver sion 20	20
6.4.5.1 Set ting the Char ac ter iza tion Co ef fi cients 21	21
6.4.5.2 Testing the Co ef fi cients 21	21
6.5 Fil tering 21	21
6.6 Set ting the Cur rent 22	22
6.7 Power Saver 22	22
7 Dig i tal Com mu ni ca tions In ter face 23	23
7.1 Se rial In ter face 23	23
7.1.1 Set ting the Baud Rate 24	24
7.1.2 Au to matic Trans mis sion of Mea sure ments 24	24
7.1.3 Time Stamp and Sys tem Clock 24	24
7.1.4 Du plex Mode and Line feed 25	25
7.2 GPIB In ter face 25	25
7.2.1 Set ting the Ad dress 26	26
7.2.2 Set ting the Ter mi na tion Char ac ter 26	26
7.2.3 Time Stamp 26	26
7.3 Re mote Com mands 26	26
7.3.1 Mea sure ment Com mands 26	26
7.3.1.1 Read ing Tem per a ture 28	28
7.3.1.2 Au to matically Trans mitting Mea sure ments 29	29
7.3.1.3 Se lecting the Unit of Mea sure ment 29	29
7.3.1.4 En abling the Time Stamp 29	29
7.3.1.5 Set ting the Clock 29	29
7.3.2 Probe Char ac ter iza tion Com mands 29	29
7.3.2.1 Se lecting the Char ac ter iza tion 29	29
7.3.2.2 Testing the Char ac ter iza tion 30	30
7.3.3 Sam ple Com mands 30	30
7.3.3.1 Set ting the Fil ter 30	30
7.3.3.2 Set ting the Probe Cur rent 30	30
7.3.3.3 Set ting the Power Saver 31	31
7.3.4 Com mu ni ca tion Com mands 31	31
7.3.4.1 Set ting the Du plex Mode 31	31
7.3.4.2 Set ting the Line feed Op tion 31	31
7.3.5 Cal i bra tion Com mands 31	31
7.3.5.1 En tering the Pass word 31	31
7.3.5.2 Set ting the Menu Lock out 31	31
7.3.5.3 Set ting the Cal i bra tion Co ef fi cients 32	32
7.3.5.4 Set ting the Se rial Num ber 32	32
7.3.6 Other Com mands 32	32
7.3.6.1 In stru ment Iden ti fi ca tion 32	32
7.3.6.2 Read ing a List of Com mands 32	32
8 Cal i bra tion Pro ce dure 33	33
8.1 Ac cessing the Cal i bra tion Pa ram e ters 33	33
8.2 Cal i bra tion Pro ce dure 34	34
9 Main te nance 35	35
10 Trou ble shooting 37	36

Fluke 1502A-156 Product Manual - Page 24

Setting the Baud Rate, Automatic Transmission of Measurements, Time Stamp and System Clock

Page 24 highlights