Intelligent Board with 12 Serial Interfaces


  • 8 channel controller SAB82538

  • 4 additional interfaces via SCC of the CPU

  • RS-232, RS-422, RS-485 or TTY selectable by adapters (piggybacks)

  • Min. 38.4 kBaud / 12 channels simultaneously

  • Channels electrically isolated via optical couplers and DC/DC-converters, no disturbances

  • 2x 50-pin post connector for adapter board ESP360

  • CPU 68360/33 MHz

  • LED displays and test sockets at the front panel

  • Functions and connections compatible to VME-ISER8

Serial Controllers
The VMEbus unit VME-ISER12 is an intelligent interface board with 12 serial interfaces for process interfacing, and an additional RS-232 interface for the connection of a terminal for service and programming. The serial controller SAB 82538 controls 8 serial interfaces. The CPU 68360 controls four further interfaces and the terminal interface via the SCC.

Physical Interfaces
The interfaces and VMEbus potentials are electrically isolated from each other by optical couplers and DC/DC-converters.
Piggybacks realize locally the physical interfaces RS-232, RS-422, RS-485 and TTY-passive. In standard option the board is equipped with RS-232 drivers in sockets. This interface is connected via the VMEbus connector P2.

The board is double Europe format with 4 HP (1 slot) width. 9 serial channels are available via the VMEbus connector P2. An additional channel can be connected via a 9-pin post connector in the front panel. The second DSUB-connector in the front panel is for the terminal interface (RS-232).
The TTL-signals of the serial channels are connected to two 50-pin post connectors.

QUICC-Power On-Board
The CPU 68360 with a phase frequency of 33 MHz controls the local units. The firmware is stored in the Flash-EPROM.
The firmware can be updated via a service interface in the front panel.

VMEbus Interface
In standard option the board offers the data transfer options SADO24 and SD16.
Optionally, the board can also be equipped with an A32/D32 interface. When using the local physical interface, however, this option is not recommendable, because the isolation distances become very narrow.

ESP360-Transition Modules
Via the two 50-pin post connectors two transition modules of ESP360 type can be connected. Each of these transition modules offers the transition of four serial physical channels to the physical interfaces RS-232, RS-422 and RS-485. Two additional channels can be operated as RS-232 and RS-422 interfaces. They are connected via six 15-pin HD-DSUB connectors in the 6 U front panel of the modules. With two ESP-modules all 12 serial channels of the VME-ISER12 are accessible as e.g. RS-232-interfaces. In the ESP360 modules the channels can be selected via software, bridges in the connector or solder bridges, because the interface options for each channel are parallel. One advantage of the ESP360 adapter boards is the large isolation distance of the electrical isolation, which allows voltages of up to 300 VDC/ 250 VAC.

LED Displays
Via keys and a 7-segment display in the front panel a serial channel can be selected in order to display its signals to LEDs. The selected signals can then be read directly at the front panel at 2 mm test sockets. The power supply of the electrically isolated interfaces is shown for each channel via LEDs.

A channel-oriented RAM interface is available as firmware for the local CPU. The VME-ISER12 communicates with the VMEbus master via the local RAM. Here, the commands and parameters are stored which come from the local CPU. The serial data is buffered in the RAM, too.
Because of this Shared-RAM interface, the implementation into different master operating systems is easy as well. Drivers for most real-time operating systems, such as OS-9, VxWorks or RTOS-UH are available.

VME-ISER12 - Intelligent Board with 12 Serial Interfaces by esd
Not recommended for new designs