Campbell Scientific SDS511 CSA Dual CS I/O Port Adapter - Manual (Page 3)

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SDS511 Dual Port Adaptor
1. Introduction
The SDS511 dual port adaptor allows two modem-enable (ME) or SDC
devices to share a physical connection with a single CS I/O port on a CR500,
CR510, CR10, CR10X or CR23X Campbell Scientific datalogger. Although
only one communications device can be electronically connected to the CS I/O
port at any one time, the SDS511 connects the CS I/O port to either of the two
devices on a first-in-first-served basis. If one communications device has
access to the CS I/O port and the second device requests a connection, no
connection will be made until the first device has terminated its session. The
SDS511 does NOT allow concurrent communications between the two
communications devices and the CS I/O port.
2. Installation
The SDS511 can be mounted on an enclosure backplane using the backplane
grommet and screw included. Alternatively, the SDS511 can be mounted on
the enclosure wall using double-sided adhesive tape or velcro. The single
flying lead with DB9 connector is connected into the datalogger’s I/O port.
The two DB9 connectors on top of the SDS511 are for connecting up to two
ME or SDC communications devices. With the 2 DB9 connectors facing
upwards and the datalogger communications cable on the left, the top DB9 is
numbered Port 1 and the bottom DB9 is numbered Port 2. Port 1 can be used
for both SDC (CR10KD, COM300, etc) and ME devices. Port 2 can be used
for ME devices only. These include a computer, Palm device, SC932,
COM200, CD294, etc. Up to three SDS511 devices can be cascaded if further
devices are required.
The SDS511 is ideally suited to communications devices which access the CS
I/O port intermittently for short duration. These include the CD294 DataView
Display, CR10KD, notebook computer, Palm device and telephone modems. It
is not suited to communication devices which tie-up the CS I/O port for
extended periods.