Installation ARINC 429 Slew Rate Configuration for CEI-100/CEI-200
CEI-100/CEI-200/CEI-x20 User’s Manual 6
ARINC 429 Slew Rate Configuration for CEI-100/CEI-200
Some jumpers may be installed on the CEI-100 and CEI-200 boards to
allow proper selection of ARINC transmission slew rate. On CEI-x20
devices, slew rate selection is automatic. The slew rate refers to the rise
and fall times for the ARINC signals.
To configure the slew rate for low-speed transmission (12.5K bps) for a
channel, install a pair of jumpers to connect the proper capacitance. The
bit rate (100K or 12.5K) is software-programmable. As a rule, it is
possible to run at either bit rate without the jumpers in place. However, to
meet the ARINC 429 specification exactly for low speed slew rate, you
must install the appropriate jumpers.
Transmitting at low speed without the jumpers installed causes the ARINC
waveform to be squarer than the specification defines. However, most
ARINC 429 receivers can tolerate this. Transmitting at high speed with
the jumpers in place makes the waveform so far out of specification that it
is not useable.
Configuring the CEI-820TX
This section provides configuration information for the CEI-820TX.
CEI-820TX Input/Output Connector Pin Out
To couple the CEI-820TX to ARINC devices, a front bezel connector (P1)
and a mezzanine PMC connector (P14) are provided. The front bezel
connector is a 68-pin SCSI connector (AMP/Tyco part number 787394-7).
Figure 1. 68-pin Receptacle Connector (SCSI-3 compatible, view facing receptacles)
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
To Next Page
Loading...