eDAQ e-corder, Manual

Page: 30 / 112

26 eDAQ Potentiostats
USB socket
The USB socket is for future development and at the time writing it is
unimplemented. Check our web site periodically for the release of new
features.
I
2
C Connectors
The Dual Picostat back panel, Figure 3–3 , has two DB-9 pin ‘I
2
C bus’
connectors labelled Input and Output. The Input connector carries the
various control signals (for gain range and filter selection) to and from
the
e-corder
. A cable is provided with the Dual Picostat for this purpose.
The pin assignments are shown in Figure 3–4 .
The Output connector can be used for the attachment of a second Dual
Picostat or other suitable eDAQ Amp. More information about the I
2
C
connector can be found in your e-corder Manual .
Grounding Connector
The Dual Picostat back panel, Figure 3–3 , has a 4 mm grounding
socket. This enables connection of a Faraday cage (with the green
grounding cable included with the Dual Picostat) the use of which can
greatly diminish electrical noise. The construction of the Faraday cage
can range from a simple cardboard box covered with aluminium foil, in
which the electrochemical cell is located, to a more sophisticated
copper mesh enclosure or sheet-metal box.
Digital Gro
und
Regula
ted
–17 V DC
Regula
ted
+8 V DC
Regula
ted
+17 V DC
Power lines
SCL DSC SDA DSD IN
T
I
2
C control signals
Digital Gr
ound
Regulat
ed –17
V
DC
Regulat
ed +8
V
DC
Regulat
ed +17
V
DC
SCL DSC SDA DSD INT
I
2
C control signals
Input Output
1
6
9
5 5
9
6
1
Figure 3–4
The pin assignments for
the Input I
2
C DB-9
connectors.
WARNING!
The I
2
C connectors are
for the control of
eDAQ Modular
Potentiostats, page 2
,
and should not be
used for connection to
any other device.