The following devices are compatible with fiber-optic channel 2 of the SM128V:
ibaPADU-8-O,
ibaLink-SM-64-SD16.
ibaBM-DPM-S-64.
ibaFOB-4i-S and ibaFOB-io-S (Input),
ibaFOB-4i-D, ibaFOB-2i-D and ibaFOB-io-D (Input),
ibaBM-FOX-i-3o and ibaBM-FOX-i-3o-D,
ibaBM-COL-8i-o
Both fiber-optic output channels (Channel 1 and Channel 2) can be interfaced to indi
vidual ibaCom-PCMCIA-F cards via the X4 and X5 RJ11 sockets. Note that only one
ibaCom-PCMCIA-F card may be used at a time in a Notebook measurement PC.
The VMEbus interface
The SM128V supports a maximum of 64 input channels (a + d) and 128 output chan
nels. The card occupies 256 kByte memory space on the VMEbus. The base VME ad
dress is adjustable using the DIP switch settings as described above.
From the VMEbus viewpoint, WORDs and DWORDs can be read and written in BIG
ENDIAN or LITTLE ENDIAN format. The SM128V-card can accept both formats. The
used format has to be configured with a DIP switch.
Whether the link sends in integer or float format must be defined prior to installing the
SM128V. Use the DIP switch to change this setting for each fiber optic link. Each fiber
optic link must be set independently. Data must then be written to the appropriate regis
ters.
The digital channel values may be written in channel-wise in either a DWORD for each
digital channel (bit 0 of each DWORD) or an 8 byte bit mask. Prior to sending the tele
gram the respective registers are OR’d to determine whether a 0 or 1 is sent in the tel
egram. For this reason, it is important to reset the registers of the unused method.
It’s an asynchronous take-over of data from the VME range into the buffer of the FOB
transmitter. Data coming out of the VME range will be synchronized with the 1 ms clock
of the FOB interface. Thus the take-over time for the data varies between 0 and 1 ms.