9250-05-Manual.DOC
07/19/00
High-Speed Resistance Tester – Model 9250-05
Operators Manual
15
System Operation
Before applying power to the Model 9250-05, set up the communications software that will be
used to interface with the Model 9250-05. Also be sure that the communications lines are installed
and attached to the Model 9250-05 and the host computer.
Serial Communications
The host computer serial communications interface for the Model 9250-05 is based upon the
DEC
VT-100 (ANSI) terminal emulation for the IBM PC
®
for RS-232 communications. The RS-232
output communications port operates as the DCE, with the host computer as the DTE. Any ANSI
terminal emulator will probably function with the Model 9250-05 as a terminal emulator, as well as
many commercial communications software packages (such as PROCOMM
®
).
Communications protocol for the serial output are RS-232C ASCII, six-characters with a decimal
point, space padded with a carriage-return and line feed in a
10-bit frame
running:
No Parity, Eight Data Bits and One Stop Bit (N,8,1)
with One Start Bit.
The communications can be set for a baud rates of (underlined is factory default):
9600bps, 19200bps, 38400bps, 57600bps.
When setting up for operation with a personal computer (PC), be sure that no other serial devices
are sharing the communications port on the PC. The Model 9250-05 requires a standard
communications port for operation.
For this manual, the Windows
®
TERMINAL program will be used as an example communications
program for interfacing with the Model 9250-05. The Windows
®
TERMINAL communications
program must be configured to operate with the Model 9250-05.
RX/TX Lamps
In the middle of the front panel of the Model 9250-05 are two red lamps labeled RX and TX.
These lamps will illuminate when RS-232 communications are in operation. Whenever commands
are being received by the Model 9250-05, the RX lamp will illuminate and whenever the unit is
transmitting data to the host computer (or LED Display/Keypad Customer Interface – DK Option
section), the TX lamp will illuminate.
If these lamps do not light when power is on to the unit AND the host computer is sending
commands to the Model 9250-05, verify that the serial communications cable is properly attached
at both ends. If the lamps still will not illuminate, contact Harris Instrument Corporation IRT
Service for more information.
