Data Transfer Over The Ieee/Iec Interface; Introduction; Data Conventions - BRUEL & KJAER 1050 Instruction Manual

5. DATA TRANSFER OVER THE IEEE/IEC INTERFACE
5.1. INTRODUCTION
The digital interface of the Type 1050 is designed according to ANSI/IEEE Std 488-1978,
"IEEE Standard Digital Interface for Programmable Instrumentation". Since the only sig-
nificant difference between this and IEC Publication 625-1 is in the type of connector
specified, compatibility with these standards is only a question of which connecting
cable is used.
The Type 1050 is connected to other instruments with IEEE/IEC interfaces using the
following 8
&
K cables and connectors.
1. Cable AO 0265, which has an IEEE standard connector at each end, connects the
1050 to other instruments equipped with the IEEE connector.
2. Cable AO 0264, with an IEEE connector at one end and a 25-pin IEC standard con-
nector at the other end, connects the 1050 to instruments equipped with the IEC
connector.
3. Cable AO 0184 with Adaptor AO 0195 is used to connect the 1 050 to earlier 8 & K
instruments equipped with a female slide-lock connector.
4. Adaptor AO 0195 allows 25-pin IEC standard cables (e.g. AO 0194) to be connected
directly to the 1050.
More detailed information about the IEEE/IEC bus system can be found in the 8
&
K
publication Interfacing Brae/ & Kjcsr Instruments, which also contains a list of further ref-
erences.
WARNING: Switch off all equipment before connecting or disconnecting the digital inter-
face. Failure to do so could damage the equipment.
5.1.1. Data Conventions
34
The codes and formats used by the Type 1050 in sending and receiving data and/or
messages via the IEEE/IEC interface have been designed according to the recommen-
dations of IEEE Std 728-1982, "IEEE Recommended Practice for Code and Format Con-
ventions (For Use with ANSI/IEEE Std 488-1978)". This standard is identified by the IEEE
as a recommended practice rather than an absolute standard. It
~eeks
to define stan-
dard forms for the transfer of various types of data on the IEEE 488 interface, and so to
improve the level of communication between instruments equipped with the interface. In
particular, IEEE 728 recommends that all messages use ASCII/ISO 7-bit coding and it
defines standard header messages, data formats and message separators and termina-
tors.