Remote-processing BASIC for the CX-10 Modbus Instrukcja Użytkownika Pobierz pdf (Strona 57)

BASIC PROGRAMMING GUIDE

2-48

REGREAD

Syntax: REGREAD(

)

Function: Return value from a modbus register

Mode: Command, run

Use: PRINT REGREAD(1)

100 A = REGEAD(n)

DESCRIPTION

REGREAD function returns an integer or float from a modbus register. Variable type conversion is

automatically converted to a format compatible with Basic 52 (BCD floating point).

range can be between 1 and 65535. However, this is board dependent. Consult your board manual

for valid registers. Most boards have valid ranges and gaps between ranges and are not contiguous.

Floating point numbers stored in modbus registers are in IEE-754 format. This format is known as single

precision. Effectively 7 digits plus exponent can be stored in this format. There are some numbers that, when

stored using REGWRITE, will return a slightly different number.

For example, if you stored one of the original numbers below using REGWRITE, REGREAD will return a

slightly different number.

Original REGREAD

80.3 80.30001

80.6 80.59999

For all intents and purposes the differences are not significant, less than 0.0001245%.

ERROR

BAD ARGUMENT - when

is not valid or out of range.

EXAMPLE

100 REGWRITE 7033,A

120 PRINT REGEAD(7033)

>run

1 2 ... 52 53 54 55 56 57 58 59 60 61 62 ... 83 84

Brak uwag

Remote-processing BASIC for the CX-10 Modbus Instrukcja Użytkownika Strona 57