Talk-Only Mode; Manually Started Documentation In "Talk Only" Mode; Automatic Documentation In "Talk Only" Mode; Rs-232-Port - Hameg Instruments Ho79-6 Handbuch

1.3 Talk-Only mode

In this mode IEEE-488 devices can be used for documentation, which are set to "listen
only" mode. In that case an IEEE-488 controller is not required.
There are two types of documentation in "talk only" mode:

1.3.1 Manually started documentation in "talk only" mode

Prerequisite switch SW1 is in position "0, 1, 2 or 3" and switch SW2 is in position "0",
the documentation can be started by briefly pressing the "start" pushbutton or by the
corresponding command received by the RS-232 port.

1.3.2 Automatic documentation in "talk only" mode

This mode is present if switch SW1 is set to values between "0 and 3" and switch SW2
is in position "F".
Oscilloscope and interface must be prepared for automatic documentation in the
following manner. First the oscilloscope must be set to SINGLE mode and thereafter the
RESET pushbutton must be pressed briefly to activate the trigger unit. After a trigger
event has started the signal capture and the recording is completed (RESET-LED dark),
the "start" pushbutton located on the interface must be pressed to cause documentation.
Thereafter the oscilloscope trigger unit is reset automatically. From now on each trigger
event causes documentation. In this mode the interface has to detect the presence of
a completed recording. Each query causes the "RM"-LED to light.

1.4 RS-232-Port

This bidirectional port enables bit serial data transfer from and to a PC, but can also be
used for documentation (e.g. plotter, printer). The connections of the RS-232 port (9 pole
D-Sub female) can be seen in the appendix.
The signals at the RS-232 port are assigned as follows:
Pin Function
2
3
7
8
5
For that reason a screened 9pole extension cable which is wired 1:1 can be used and a
null modem cable is not required. If e.g. the PC has a 25pole COM port, an adapter which
converts the lines must additionally be used at the COM port. Adapters like these are
available in computer shops.

1.4.1 Hardware configuration

The RS-232 port can be used for documentation purposes, if switch SW1 is active (not
overwritten by software configuration) and set to 4, 5, 6 or 7.
Data transfer can be performed independent from the hardware configuration.

1.4.2 Software configuration

The setting of switch SW1 can be overwritten by a suitable command received by the
IEEE-488 or RS-232 port (data transfer). Subsequently the mechanical setting of SW1
becomes inactive until the oscilloscope is switched off for approx. 10 seconds.
3 8
Tx Data
Rx Data
CTS
RTS
Ground
Änderungen vorbehalten / Subject to change without notice