Interfaces - Hameg HM 8131-2 Manual

Interfaces

7.0 Interfaces
The HM8131-2 is suited for use in automated test installations.
The standard interface is a RS-232. This can be exchanged
against an IEEE-488 interface (option HO88-2), with this installed
the HM8131-2 can be controlled by an IEEE-488 bus controller.
As a further option the interface HO89-2 is available, however
only necessary if the standard features of the basic interface are
not sufficient. See chapter "Serial interface".
All HM8132-2 interfaces are isolated ones. If the instrument is
remotely controlled this will be indicated in the display:
Fr: 1.0000000 kHz
>Remote Local
In order to switch to local press the button underneath "Local".
If it is not desired that the instrument can be manually operated
the command "Local" can be locked out by the software command
"LK1". To release the lock the command "LK0" is used.
STOP
Software command "Local lockout":
This command prevents manual operation. This may be
necessary if the instrument is part of a test system.
TiPP
How to change interface parameters
OPTIONS MENU 1 offers the available opportunities for changing
interface parameters by going to (Com). Of course, only such
parameters can be changed which are applicable to the type of
interface installed.
** OPTIONS MENU 1 **
Com Mcard Memo -->
* SERIAL INTERFACE *
4800 None 8
IEEE-488 interface HO88-2
With this interface installed the HM8131-2 will respond to all
commands standardized for IEEE-488. The instrument address
can be chosen between 1 and 30 in the menu.
This address will be displayed each time the instrument is turned
on. Commands may be given lower or upper case. Separation
marks within a set of data allow for multi-line commands. Within
one data packet there may be more than one instrument resp.
interface command, those are to be separated by the appropriate
marks.
These separation marks will be accepted:
– Space 20H
– Comma 2CH
– Semicolon 3BH
The end of a message is always carriage return 0DH. Data and
commands are separated by a colon. Units are not transmitted.
All data are transmitted as floating point data with the exception
76
2
of the numbers of the set-up memory locations and the coordinates
of arbitrary signals. Those are in integer respresentation. If the
indicated precision of floating point numbers is excessive the last
digits will be deleted.
The address in the HM8132-2 display and the address
keyed into the DIP switches on the HO88-2 interface
must be identical. Further information can be found in the
HO88-2 manual.
STOP
Standard serial interface
The standard interface can be used via the rear panel 9pin
connector. The Baud rate can be selected as: 300, 800, 1200,
2400, 4800, 9600. All other parameters can not be changed:
8 bits data, no parity bit, 2 stop bits, Xon/Xoff – protocol (11H/
13H). In cases where this interface will not operate the optional
interface type HO89-2 may be used. This interface allows for the
same Baud rates and in addition the selection of: parity bit yes/no,
STOP
number of data biots (7/8) and the number of stop bits (1/2).
Exchange of RX/TX:
It is possible to interchange the RX/TX terminal
connections by moving the slide switch accordingly.
TiPP This allows the use of cables with interchanged RX/TX.
How to send commands to the instrument
Send one or more commands to the instrument via the interface.
These separation marks will be accepted:
– Space 20H
– Comma 2CH
– Semicolon 3BH
At the end of a commans sequence transmit a CHR$
decimal points when transmitting data e.g. for the amplitude, not
commas.
Sequence of commands necessary to configure the
instrument:
1. Waveform type (SIN, TRI..)
2. Operating mode (CTM, GTM..)
3. Sweep mode (SW0, LOG, STT..)
4. Reference frequency (RFX, RFI..)
5. Modulation type (AM0, FSK1..)
6. Frequency (FRQ.xxxx)
7. Display of voltage (VPP, RMS)
8. Set amplitude to lowest value in range (AMP:xxx)
9. Offset voltage (OFS:xxx)
STOP
10. Set amplitude (AMP:xxx)
11. Switch ouput on/off (OT1, OT0)
Sequence of commands for the arbitrary mode:
1. Transmit ARC4
2. Transmit ARP4:xxxx=yyyy, all 4096 values.
TiPP
3. Transmit ARE
. Use
Subject to change without notice