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QTERM-IV/P40 User's Manual
Beijer Electronics Fax 801-466-8792 Web www.beijerelectronicsinc.com Phone 801-466-8770
ies, so the regulator option should not be ordered with the
battery back option.
Because of the battery compartment, the connectors on a
battery-back unit can only exit from the top of the case.
5.3
Panel-Mount QTERM-IV
The panel-mount QTERM-IV is mounted directly onto
your instrument or enclosure. Figure 5-2 shows the dimen-
sions of the panel-mount QTERM-IV as well as the mount-
ing cutout required to install it.
The QTERM-IV is mounted to the panel via two steel
brackets that span across the back of the panel cutout and
are attached by four self-tapping screws that insert from the
rear of the panel and screw into bosses on the QTERM-IV
panel-mount enclosure. Screws and brackets are included
with the QTERM-IV; these are usable with panels up to
about 4 mm thick. If you are using a thicker panel, use M3
(#4) self-tapping screws that are about 8 mm longer than
the panel thickness.
Connection to the panel-mount QTERM-IV is made via a
2-mm connector on the internal PC board which is accessi-
ble from the back of the mounting panel. The pin assign-
ments for the panel-mount QTERM-IV connector are
shown in Table 5-1; the lines dig0 and dig1 are discussed in
section 5.5.3. The connector pin numbering is shown in
Figure 5-3.
5.4
Interfaces
5.4.1
EIA-232 Interface
With proper cables and good grounding, the EIA-232
QTERM-IV can communicate up to about 15 meters at its
top speed of 9600 baud. The QTERM-IV does not monitor
or control any of the EIA-232 modem-control lines (such as
RTS and DTS). Handshaking between the host and the
QTERM-IV is done using software XON/XOFF com-
mands. The XON/XOFF operation can be disabled (via
software commands or the QDATA file) if you do not wish
to have it operate.
5.4.2
EIA-422 Interface
With proper cables and grounding, the EIA-422 interface
can communicate up to a distance of about 1000 meters.
Since the EIA-422 version of the QTERM-IV requires four
communication lines and two power lines, the dig0 and
dig1 lines are not available.
The EIA-422 unit does not have the 120
Ω
line termination
resistor often used to terminate an EIA-422 interface. If you
need this resistor, you can install it on the main PC board
(for handheld units, remove the back of the case). Figure 5-
4 shows where the resistor is to be soldered in. Do not
attempt to remove the PC board from the case!
For volume orders, Beijer Electronics can supply the
QTERM-IV with this resistor installed.
Figure 5-2. Dimensions of the Panel-Mount QTERM-IV.
Panel
Cutout
