Appendix A

API Commands

 

 

Data Output Formats

Data Type

Engineering Units

Binary

 

Counts

 

 

High Byte /

Low Byte /

 

 

 

Low Byte

High Byte

 

Temperature

xxxx.xx °C

H/L

L/H

±xxxxx

 

xxxx.xx °F

 

xxxx.xx °R

 

 

 

 

xxxx.xx °K

 

 

 

Volts

+xx.xxxxxxxxx

H/L

L/H

±xxxxx

Time/Date

hh:mm:ss.mil,

hmstMDY

 

hh:mm:ss.mil,

Absolute

MM/DD/YY

 

 

MM/DD/YY

Relative

hh:mm:ss.mil,

hmstMDY

 

hh:mm:ss.mil,

 

DDDDDDDD

 

 

DDDDDDDD

Timebase

hh:mm:ss.t

Interpreted as engineering units

Interpreted as

 

 

 

 

engineering units

Legend

x = ASCII digit

H = high order byte

x = ASCII digit

h = hours

L = low order byte

h = hours

m = minutes

h = hours

m = minutes

s = seconds

m = minutes

s = seconds

mil (see Note 1)

s = seconds

mil (see Note 1)

MM = months

t = tenths

MM = months

DD = days

M = months

DD = days

YY = years

D = days

YY = years

DDDDDDDD= Days

Y = years

DDDDDDDD=

 

 

Days

Note 1: mil is milliseconds for ASCII, but microseconds for binary (2-hexidecimal) output format.

Data output formats differ slightly from data input formats in that binary formats may be used for Channel Data. Channel Data is the only output data which may use the binary format (if it is specified). Channel Data is defined as data originating from the High/Low/Last (HLL) Registers or the Acquisition Buffer. The commands that initiate Channel Data output are the R, R#, U4, U5 and U13 commands. However, Channel Data may also be output as Engineering Units and Counts.

Data output formats for command queries will follow the same rules as data input formatting. As in the case of data input formats, all readings output will be in Engineering Units unless Counts is specified. However, there are only 3 command queries which need to follow the F command format in this fashion. They are C?, L? and U8 command queries.

Note: It also should be noted that readings are only converted to the specified engineering units if the associated channel type is a channel that supports those engineering units. For example if the specified channel is a volts channel and the engineering units is 0 (°C), the reading will be interpreted as volts, not a temperature in °C.

Note: When Binary formats are specified, the HLL, Scan and Block terminator do not apply.

The following table shows the effect of the Set Data Format (F) command on readings input/output formats for the commands and queries over which it has control. Refer to the Data Format section of Appendix C for more examples.

Reading Formats

 

Command

Engineering Units

Binary

 

Counts

 

 

 

 

High Byte /

 

Low Byte /

 

 

 

 

 

Low Byte

 

High Byte

 

 

 

C

Engr. Units

Engr. Units

 

Engr. Units

Counts

 

 

C?

Engr. Units

Engr. Units

 

Engr. Units

Counts

 

 

L

Engr. Units

Engr. Units

 

Engr. Units

Counts

 

 

L?

Engr. Units

Engr. Units

 

Engr. Units

Counts

 

 

U8

Engr. Units

Engr. Units

 

Engr. Units

Counts

 

 

U4

Engr. Units

Binary (H/L)

 

Binary (L/H)

Counts

 

 

U5

Engr. Units

Binary (H/L)

 

Binary (L/H)

Counts

 

 

U13

Engr. Units

Binary (H/L)

 

Binary (L/H)

Counts

 

 

R

Engr. Units

Binary (H/L)

 

Binary (L/H)

Counts

 

 

R#

Engr. Units

Binary (H/L)

 

Binary (L/H)

Counts

 

ChartScan User’s Manual

A-31

Page 157
Image 157
Omega Vehicle Security 1400 manual Data Output Formats, Mm/Dd/Yy, Dddddddd =

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