User manual

6 GMC-I Messtechnik GmbH
1.3 Options and Accessories
Options
(See order information on last page.)
Devices can be equipped with an IEEE 488 plug-in interface
module for integration of SSP KONSTANTERs into IEC bus
controlled systems.
The interface is in compliance with requirements set forth in the
IEEE488.2 standard (IEC 625-2), and is frequently designated
as a GPIB (general purpose interface bus) or an HP-IB (Hewlett
Packard interface bus).
Programming of all device functions, as well as querying
measured and configured parameters, is possible via the
interface. Several specific interface functions are also provided.
The interface option is supplied as a separate plug-in module for
easy, subsequent installation to the KONSTANTER.
Included accessories:
The following accessories are included with the
SSP KONSTANTER:
❑ These operating instructions
❑ 1 mains power cable with earthing contact plug
(approx. 1½ meters)
Additionally available accessories:
(See order information on last page.)
❑ 19" rack adapter, 1 x 32 N
required for installation of one series SSP 32 N or SLP 32 N
KONSTANTER to a 19" rack
❑ 19" rack adapter, 2 x 32 N
required for installation of two series SSP 32 N or SLP 32 N
KONSTANTERs to a 19" rack
❑ Mains jumper cable, 0.4 meters
The cable is equipped with a 10 A inlet plug and a 10 A inlet
socket. It is used for looping mains power through when
several KONSTANTERs are mechanically combined into a
multi-channel unit. In this way, the complete unit requires
only one mains power cable.
❑ RS 232 bus cable, 2 meters
For connecting one KONSTANTER to an RS 232 interface.
(extension cable, 9-pin socket / 9-pin plug connector)
1.4 Functional Principle
Power Supply
Required DC supply power is generated for each respective
circuit from mains power which has been fed to the power pack
via an interference suppression filter, a wire fuse, the mains switch
and inrush current limiting.
The Central Processing Unit (CPU)
Overall control of the SSP KONSTANTER is accomplished by
means of the CPU on PCB A. It uses an 80C32 8-bit
microcontroller with 64 kilobytes of program memory and 32
kilobytes of battery-backed CMOS RAM.
An 11 MHz pulse generator establishes the clock frequency for
the processor, and creates a time reference for the serial
interface.
A watchdog circuit monitors processor activity and disables
access battery-backed RAM in the event of supply power failure.
Operation
Generally speaking, all of the functions of the SSP KONSTANTER
can be controlled with the adjusting elements at the front panel,
via the RS 232 interface or via the optional IEEE 488 plug-in
interface module.
Displays and Control Panel
Both 4-place 7-segment displays and the individual LEDs are
controlled statically by the processor via the registers. Front panel
key operations are processed by means of a group interrupt and
subsequent direct querying. The rotary pulse encoders control
the increment and decrement counters depending upon the
direction of rotation. Each time an adjusting element is activated,
an interrupt occurs at the CPU which then causes an appropriate
response.
Interface Option
The SSP KONSTANTER with installed interface module allows for
control via the IEEE 488 bus in addition to serial operation.
Remote Control
Device messages received by the interface are forwarded to the
CPU where they are first saved to RAM. After receiving an end-of-
message character, data are checked for correct syntax,
plausibility and limit values. Valid commands are subsequently
executed.