Ametek 7100 Leak Detect Stik Manual de usuario descargar pdf (Pagina 5)

1.2: Frame Protocol

All 7100 probes transmit data in the same general format. In this format, information is conveyed during a

discrete period of time called a frame. The duration of a frame varies depending on the probe type. Table 1

species the frame periods for various probe types.

7100 series probe data consists of a series of pulses that are transmitted along the wire pair that provides

power to the probe. Pulses are grouped in pairs called readings. Position and temperature information can be

determined by measuring the period between the two pulses that comprise a reading.

A frame consists of a sync. period followed by 15 readings. The sync. period is a period of time during which

no pulses occur. An external device that is attempting to synchronize with the probe data should start looking

for the rst pulse in reading 1 after detecting a period greater than sync. period during which no pulses occur.

Table 1 lists the recommended sync period for various probe types.

Table 1 - 7100 Probe parameters by probe type

Probe Type Overall Length Frame Period Sync Period Reference Magnet

Types 1, 4

0 < L ≤ 18

72 ms 7 ms No

Types 2, 5

18 < L ≤ 24

144 ms 16.6 ms No

Types 3, 6

24 < L

144 ms 16.6 ms Yes

NOTE: Probe types 1, 2, and 3 are 5 thermistor probes (R5 designation in part number). Probe types 4, 5,

and 6 are 1 thermistor probes (R1 designation in part number).

Sync

Period

Frame Period

Reading 15

Reading 14

Reading 13

Reading 12

Reading 11

Reading 10

Reading 9

Reading 8

Reading 7

Reading 6

Reading 5

Reading 4

Reading 3

Reading 2

Reading 1

Figure 2: Data Frame Relationship Between the Data Pulses, Sync and Frame Periods

Figure 1: One frame of Data

Return to Start of Frame

16 Time Slots

#1 #2 #3 #4 #5 #6 #7 #8 #9 #10 #11 #12 #13 #14 #15 #16

Pause

Temp #1

Water

Temp #2

Product

Temp #3

Product

Temp #4

Product

Temp #5

Product

Circuit Temp

Product

Low Ref

Product

High Ref

1 2 3 4 5 6 7 8 9 10 ... 21 22

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