CTD-N Technical Manual
P/N 95F-6000-00 (February 2017)
page 15
EAR-Controlled Technology Subject to Restrictions Contained on the Cover Page.
RS-485 Interface Option
Systems ordered with an RS485 are capable only of RS485 communication and will require use of
an external RS485/RS232 converter for communication with a computer. A converter can be or-
dered separately from TRDI or procured independently.
CMOS Interface Option
The optional CMOS serial interface provides TTL level signal outputs. Consult TRDI directly for
more information about this option.
Connecting the CTD-N to Your Computer
The following items are required to connect a CTD-N to your computer:
•
Test cable with power supply and AC line cord
•
RS-485/RS-232 converter, for RS-485 interface connection only
•
An available serial port on the computer
NOTE.
If you will be fabricating your own cable for connecting the CTD-N to your computer,
APPENDIX B: Bulkhead Connector Wiring
for information on the CTD-N bulkhead
connector components and wiring.
NOTE.
Although any serial port from COM1 to COM16 can be used, use COM1 if it is
available, as it is the default serial port setting of CTDPro. If you use any other serial port,
you must select it in CTDPro as described in
Connecting to the RS-232 Interface
A CTD-N with an RS-232 interface is shown set up with a laptop computer in Figure 7.
To connect a CTD-N with an RS-232 interface to your computer:
1. Disconnect the dummy connector from the bulkhead connector on the instrument.
2. Connect the test cable to the bulkhead connector on the instrument and to the serial port on
your computer.
3. Connect the power supply to the POWER connector on the test cable.
4. Connect the AC line cord to the power supply and to a 110–240 VAC, 50–60 Hz power
source.
