TENNEY ENVIRONMENTAL
DATA
COMMUNICATIONS (Optional)
7
1
As an option, your chamber may include data communications with the main controllets serial
port. When employed, either a Data Communications manual or a Computer Interface manual
will be included in the Supplemental
lnstmctions Section. As a reference, the available data
types are listed and briefly described below. Please contact
a
Tenney Sales Engineer for more
informalion.
RS232C
I
RS423A: Both interfaces are compatible and use
3
wires: a single transmit wire;
a
single receive wire; and
a
common line. The maximum wire length
is
50 feet. Only a single
chamber may be connected to your computer. Data signals are measured as plus and minus
12 volts to common with
RS232C, and plus and minus 5 v71ts to common with RS423A.
RS422A: This interface uses
5
wires: a transmit pair; a receive pair; and a common line. Up
to ten chambers may be connected to your computer on a multi-drop network up to 4,000 feet
long. Data signals in each pair are measured as a plus or minus 5 volt differential.
EIA-485: This interface uses only
2
wires. Both wires are used for transmitting and receiving
data, and therefore, only one device may talk at a time. Up to
10
chambers may be connected
to your computer on a multi-drop network up to 4,000 feet long. Data signals are measured as
a plus or minus
5
volt differential. An EIA-485 card must be installed for signal conversion.
IEEE-488: This is a parallel multi-drop interface with several control and data lines. Each
device connected must be set to a unique address. Data from other test devices may also be
collected. Since the controllers we use only have serial communications, an IEEE-488 to serial
'
)
converter card is installed in the chamber. Maximum cable length is approximately
33
feet for
all devices.
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