Maximum Summit Remote User Manual
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Remote Indicator(s)
Summit’s large size allows it to be easily read from over 100 feet away when properly installed.
For best performance you should avoid locations where direct sunlight will shine on the instrument.
You must also have an AC outlet near the selected location. The AC adapter supplied with Summit
has a 6 foot cord. You can extended this distance by splicing on wire to the adapter. The table below
gives the maximum distances allowed for various gauges of wire.
Link Cables
Now that you have selected the location for the remote(s) you should measure how much wire you
will need for the link cable(s). When using multiple remotes you daisy chain the data link cable
between units. The chain starts at the master, the
transmit terminal of the master connects to the receive
terminal of the first remote. If there are more remotes
then the transmit terminal of the first remote connects
to the receive terminal of the second remote (see
diagram). To use more remotes you simply keep
repeating the pattern.
The data link used by Summit is 2400 baud, 8-N-1, RS-232 format so, you should use cable de-
signed for RS-232 data transmission. If you are unfamiliar with RS-232 cable installation you may
want to consult a professional network cabling specialist.
Summit uses circuits that conform to the current transmission standard (EIA-232). The old stan-
dard, RS-232 specified a 50 foot maximum distance for cables. Because the standard did not specify
the type of cable, some users had problems with distances of less than 50 feet and others were able to
use hundreds of feet with great success. Instead of specifying a maximum cable length, EIA-232
specifies a maximum capacitance of 2500 pF (pico Farads). This is helpful, especially for manufac-
turers of RS-232 circuits and cable, however it does not take into account real world conditions. The
real world factors that affect the data link are numerous so, we recommend that you only use cable
specifically designed for RS-232 data transmission and follow all of the suppliers recommendations.
In general, standard RS-232 cable is usable for up to 50 feet and special cables are good for lengths
of a few hundred feet. The type of cable you use is also dependent on the electrical noise of the
environment. Cables designed for low noise environments like offices, hotels, homes, are less expen-
Extending the AC Adapter wire
Wire
Gague
AWG
Extension wire length
in feet
Total wire length
(including AC adapters 6 foot
cord)
22
5
11
20
10
16
18
15
21
16
20
26
14
35
41