SRS Labs CTC100, User Manual

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Remote Programming 79
CTC100 Programmable Temperature Controller
G P IB
CTC100 units can be ordered with or without a GPIB port. If GPIB is requested, it replaces the
RS-232 port. Although any standard GPIB cable can be used, due to space restrictions a single-
ended cable (such as a National Instruments X5 cable) is recommended.
No more than three GPIB cables should be stacked on a single GPIB connector, and no more
than 14 devices can be connected to a single GPIB interface. The total length of all GPIB cables
must not exceed 2 meters per instrument or 20 meters, whichever is less.
Ethernet
Remote commands can be sent to the CTC100 using the following
methods. The CTC100 automatically determines which method is being used.
Sending ASCII text in a raw TCP/IP stream to port 23
Sending ASCII text in UDP packets addressed to port 23
A telnet connection to port 23
The IP address must be set before the Ethernet interface can be used.
The CTC100 only accepts commands from one client. After a command addressed to port 23 is
received, the CTC100 ignores commands from all other clients until the System.IP.Close button is
pressed, the Telnet or TCP/IP connection is closed, or the instrument is rebooted. One of these
methods must also be used to switch between UDP, TCP/IP, and telnet communications.
hernet connection; the
CTC100 can be connected directly to your computer with a standard Cat 5 cable.
Use the following procedure to test an Ethernet connection:
1. Connect the CTC100 to your computer with a standard Cat5 Ethernet cable.
2. Enter a suitable IP address into the CTC100's System menu. If the CTC100 is directly
connected to the computer (nothing else is connected to the network), assign 192.168.0.1
to the computer with a subnet mask of 255.255.0.0, and 192.168.0.2 to the CTC100.
3. Open a command line on your computer and try pinging the CTC100, e.g. type
ping
192.168.0.2
IP address is).
4. Install a Telnet client, such as Tera Term, on your computer. Open a new connection with
rvice set to Telnet. If using Tera Term, select
Setup > Terminal and change the Receive New-line to CR+LF.
5. If a connection was successfully made, the System.IP.Close button should no
longer be greyed out. If you touch the System.IP.Status button, you should see information
about the connection.
6. Type
popup hello
and press Enter. A popup window should appear on the CTC100's
screen.
7. Type
description
and press Enter. The CTC100 should return an instrument
description string.
Troublesho oting co mm unications problems
If the remote interface does not respond at all, try the following:
If using RS-232, make sure the baud rate is set correctly.
Make sure that each line of text sent to the CTC100 ends with a linefeed character (decimal
10 = hex 0x \
Try viewing the System.COM.History window. This will tell you if the CTC100 is
receiving anything at all.