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Section 3. ET Instrumentation Installation
3-12
3) Connect the 5-foot patch cord to the Rad Modem. Fasten the cable to the
strain relief tab with a cable tie. Connect the Rad to the PC's serial port
either directly (25 pin port) or through a 9 to 25 pin serial converter.
4) Route the user-supplied cable from the remote splice to the surge protector.
Connect it and the 5-foot patch cord to the surge protector.
- RCV (white)
- RCV (black)
+ RCV (green)
+ RCV (red)
+ XMT (red)
+ XMT (green)
- XMT (black)
- XMT (white)
- RCV
+ RCV
+ XMT
- XMT
BLACK
RED
GREEN
WHITE
2
1
3
4
- RCV (black)
+ RCV (red)
+ XMT (green)
- XMT (white)
2
1
3
4
SRM-5A
Surge
Protector
PC
User
Supplied
Cable
Splices
ET106 ENCLOSURE
ET106 ENCLOSURE
To # 8
External Connector
Earth Ground
CAMPBELL
SCIENTIFIC LTD
SC932 - S/N E1055
QC
FIGURE 3.3-5. Short-Haul Modem Wiring Diagram
3.4 Sealing and Desiccating the Enclosure
The ET Enclosure is supplied with a desiccant pack. The desiccant maintains a
low humidity in the enclosure to minimize the chance of condensation on the
instrumentation. Desiccant should be changed when the internal ET Enclosure
humidity sensor measures 30% or higher. Install the desiccant as shown in
Figure 3.4-1. Keep unused desiccant tightly sealed in an airtight container.
1) Take the desiccant pack out of its sealed plastic bag. Place it under the
desiccant strap just before leaving the station.
2) Be sure to close the enclosure hasp securely. A padlock may be used on
the latch for extra security.