Hameg Instruments HO88 Manual De Instrucciones página 21

Listener L4:
• Basic Listener
• „Unaddressed if My Talk Address" (prevents instrument from being a talker
and a listener at the same time)
Source Handshake and Acceptor Handshake (SH1, AH1)
SH1 and AH1 denote, quite simply, that the HM81.. is able to generate the handshake
cycle (using lines DAV, N RFD and NDAC) to exchange data with other instruments
and/or a Controller.
Talker(T5)
The HM81.. can transmit measurements to other devices or the Controller (it „talks").
T5 also means that the instrument can reply to a serial poll by the Controller by
transmitting a status byte.
Listener (L4)
The HM81.. can receive instructions from a Controller on the bus (it „listens").
Service Request (SR1) The HM81.. can interrupt the Controller, e.g. after each
measurement, to indicate that it has additional data to transmit.
Remote-Local (RL1) The HM81.. can be operated either manually (local control) or by
remote control (programmable mode).
Device Clear (DC1)
The HM81.. can be initialized to a predefined cleared state, either selectively or together
with all other instruments on the bus.
Device Trigger (DT1)
A new measurement can be triggered by remote control.
Command codes
For device-cfependent messages that are understood by the HM 81 .. instruments
see manuals of the HM8100 series.
Data format
Separators in the data field
Within a data transmission, the following characters can be used as separators:
These characters can also be used for multiline command codes within a data transfer.
Two or more device-dependent or interface commands can be contained within a given
data string; these are then executed sequentially. The only requirement is that they be
separated by the characters listed above.
Input and output delimitation
The standardly accepted means of identifying the end of a message on the IEEE-488
bus is by a carriage return (CR) or (0Dh), with or without EOI.
However, any other character will also be accepted as a terminator, provided that it is
send together with EOI. The last character of a message is marked by a carriage
return (CR) or (0Dh) together with EOI.
Sous réserve de modifications / Reservado el derecho de modificación
Semicolon (;) or (38h)
Comma (,) or (2Ch)
Space ( ) or (20h)
21