eDAQ Quad Tc/mV, User Manual

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Chapter 2 — The Quad Tc/mV Amp 7
The Back Panel
The back panel of the Quad Tc/mV Amp is shown in Figure 2–2 .
The Signal Outputs
The Quad Tc/mV Amp provides four signals, one for each sensing
thermocouple. These signals are accessed on the Quad Tc/mV Amp
back panel via four BNC connectors labelled Channel 1 — Channel 4.
I
2
C Connector
The back panel, Figure 2–2 , has two DB-9 pin ‘I
2
C bus’ connectors
labelled Input and Output. The Input connector enables connection to
the
e-corder (or to the output of other eDAQ Amps). This connection
provides power to the Quad Tc/mV Amp and carries the various
control signals (for gain range and filter selection) to and from the
e-corder . The pin assignments are shown in Figure 2–3 .
Connecting to the e-corder
Your Quad Tc/mV Amp will have been supplied with an I
2
C cable (DB-
9 pin connectors at either end), and four cables with BNC connectors
at either end.
1 5
9 6
Digital Ground Regulated –17 V DC Reg8 V DC Reg17 V DC
Power lines
SCL DSC SDA DSD INT
I
2
C control signals
1 5
9 6
Digital Ground Regulated –17 V DC Reg8 V DC Reg17 V DC SCL DSC SDA DSD INT
I
2
C control signals
Input Output
Figure 2–3
I
2
C connector pin
assignments