Cannon CT-2000, Instruction & Operation Manual, Page: 39 / 54

CANNON Instrument Company | Communication Options 31
Keypad Sequence
(from initial LCD temperature display):
MENU > 3 > ENTER > 2 > ENTER > 3 > ENTER
The report is a serial dump of information on the operation of the CT- 2000 and includes:
•
Instrument address
•
Unit of temperature measurement (C/F)
•
A time reference
•
Target bath temperature
•
Actual bath temperature (as measured by the bath RTD)
The frequency of temperature sampling (in seconds) for the report can then be selected from the
options on the LCD screen. The report parameters range from a report each second (keypad
selection
2 > ENTER
)
to a report every two minutes (keypad selection 8 > ENTER ).
Note:
This option can be turned off (selection 1) if there is no computer
connected via the serial line.
The serial connection can only provide time interval reports of the actual and desired bath
temperatures if the CT-2000 is configured in the point- to-point mode of operation. Otherwise, the
REPORTS DISABLED message appears on the LCD and report configuration options cannot be
accessed until the point-to-point mode is resumed.
Full Duplex (point-to-point) Connections
The RS-232 interface is furnished for a direct connection between the CT-2000 and one computer. A
DB-25 connector on the rear panel of the CT-2000 is configured as Data Communication Equipment
(DCE). This configuration permits a direct connection (straight through cable--pins 1- 8, 20).
An existing computer’s DB-9 connector may be used with a DB-25 adaptor cable (DB-25 male
connector to DB-9 female connector).
Half Duplex and Polled (Multi-Drop) Operations
The RS-485 interface is provided to permit network connections from one computer to a multiple
number of instruments. A three-wire (with feed-through) screw terminal connector is located on the
CT-2000 rear panel. A three-conductor cable (two wire-shielded preferred) can be connected to the