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Addr is the address of the VOLT 100 series. Wire sensors according to the channels specified
within the corresponding measurement instructions. The program example below shows the use
CDM_VoltSE()
of the
'Program Example: Measuring a single-ended voltage
Public
SEVolt
BeginProg
Scan
(5,Sec,3,0)
'Measure Single-Ended Voltage on VOLT 108, CPI address 1
CDM_VoltSe
(VOLT108,1,SEVolt,1,mV5000,1,True,500,60,1,0)
NextScan
EndProg
9.5 Data logger connection
VOLT 100 series devices communicate with a data logger through a CPI port. Each VOLT 100
series ships with a 6-inch RJ45 cable for this connection, though any CAT5e, or better, RJ45 cable
can be used. To allow daisy-chaining, two CPI ports are available on the VOLT 100 series. Either
can be used for connection to a data logger.
The CPI port on VOLT 100 series connects directly to the CPI port on a GRANITE data logger
module, CR6 and the CR1000X.
9.6 Connecting multiple GRANITE
Measurement Modules
The CPI bus, which handles the communications between the data logger and GRANITE
Measurement Modules, can accept addresses 1 - 120. Multiple GRANITE Measurement Modules
may be connected to a single data logger using a daisy-chain or star topology. In both network
configurations, as total cable length increases, the maximum possible bit rate decreases.
Therefore, in networks with long cable lengths, it may be necessary to use the
instruction to decrease the CPI network bit rate from its default 250 kbps. Limitations on cable
length and bit rate are discussed further in
36).
9.6.1 Daisy-chain topology
In a daisy-chain topology, GRANITE Measurement Modules are connected one after another, as
shown in
FIGURE 9-1
instruction.
CRBasic Example 1: Measuring a single-ended voltage
(p. 27).
CPI network bit rate
CPISpeed()
(p. 36) and listed in
Table 10-2
VOLT 100 series
(p.
26
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