Campbell Scientific SC932 9-Pin to RS-232-DCE Interface - Manual (Page 7)

SC932 9-Pin to RS-232-DCE Interface
3
Electrical
The SC932 uses power from the +5 V line on the 9 pin interface connected to
the datalogger. The SC932 uses only a few microamps while inactive and
about 5 mA when active from the 5 V supply. Additional current (up to 10
mA) from the 5 V supply may be used by the RS-232 device connected to the
SC932.
Physical
Height: 1.0 in (25 mm)
Width: 3.5 in (90 mm)
Length: 4.1 in (103 mm)
Weight: 4.3 oz (123 g)
Mounting: 3 in by 3 in centered holes
Environmental
Temperature: -25 to +50 o C
Humidity: up to 95% non-condensing
3. Installation
Proper transient protection should be installed to protect the computer and
datalogger in areas where damage due to lightning is possible. If this is a RAD
modem application, see Section 4.
3.1 Two Way Communication:
1. Remove the SC932 lid by removing the screw from the top of the box.
2. Jumper P3 between pins 1-2 (activated by Modem Enable) to set the
SC932 for two way communication. See Figures 2 and 3.
3. Select the jumper configuration of P2 and P4 that will minimize power
requirements and yet still allow the SC932 to function. There are three
valid configurations of these jumpers. Having both P2 and P4 open will
require the least power. Jumpering P4 only is the middle power level.
Jumpering P2 only requires the most power. Modem devices which draw
power from the SC932 interface usually require one of the higher power
levels. If the RAD modem is being used, Section 4 describes the jumper
settings to use.
4. Replace the lid.
5. Connect the SC932 to the RS-232 device and to the datalogger with the
SC12 9 pin cable (included).