Hioki RM3542-50, Instruction Manual

Page: 121 / 234

9.4 Configuring the Communications Protocol
115
9
Use the communications commands to set the measurement value transmission format to text or
binary.
See: ":SYSTem:FORMat <ASCii/ BINary>" (p. 150)
This setting applies only to the data to be sent in response to the following query messages.
•
:FETCh?
•
:READ?
•
:MEMory:DATA?
It also applies to data output sent by the measurement output functions.
Binary Data Format
Binary data is in the IEEE single-precision (32-bit) floating-point format.
Binary data is sent in four-byte sequences beginning with the first byte (which includes the sign bit).
Responses to queries that return a single value, such as
:FETCh?
, the floating-point binary data of mea-
surement values are transmitted as 4-bytes. The delimiter is not sent.
example
Transmit
:FETCh?
+ (Delimiter)
Receive (4-byte floating-point data)
In case of data with multiple values such as memory data, the delimiter ( , ) is not transmitted and only the
binary data is transmitted continuously.
example
Transmit
:MEMory:DATA?
+ (Delimiter)
Receive (4-byte floating-point data) + (4-byte floating-point data)+ ... + (4-byte floating-point data)
Set the Measurement Value Transmission format (common for RS-232C
and GP-IB)
Code
1 bit
Exponent part
8 bit
Mantissa part
23 bit
First Byte Second Byte Third Byte Fourth Byte