Comtech EF Data SDM-2020 - Manual (Page 128)

SDM-2020 Satellite Demodulator Revision 4
RS-422 Data Interface MN/SDM2020D.IOM
7–2
7.2 Description
The RS-422 interface has two data connectors and an auxiliary connector supporting
various operating modes.
• J3 Parallel/Serial DVB Connector (25-pin D, female):
Š Parallel mode - In this mode, the interface functions like a DVB parallel
synchronous interface, but with RS-422 levels. The input is at the byte rate.
Š Serial mode - An alternate form of operation is possible, where the MSB is
used for serial input at the bit rate.
• J4 Serial EIA-530 Connector (25-pin D, female):
Š Serial mode only - RS-422 levels with pinout and operation per EIA-530 at a
serial clock rate.
• J5 Auxiliary Connector (9-pin D, female):
Š Provides an additional ST Clock (output), plus open collector fault signals.
The appropriate interface control is automatically enabled when the interface module is
installed in the Demodulator. The plug-in data interface is programmable for serial or
parallel operation from either the front panel keypad or the remote port on the rear panel.