DNF Controls Analyst, RS422/RS232 Tester With (LOG 1) SR Data Logging Option - Manual (Page 21)

The Analyst RS422/RS232 Tester Page 17 of 27
Step# On Analyst Display What it means
3 The top line of the display,
after
ÎÎ, shows readable
characters.
The 2 nd line of the display,
after ÍÍ, is blank.
The transmit circuit from the Controller to the Analyst
is working.
The transmit circuit from the Analyst to the Device
may not be working.
Press the [DIR] key to select the DIR ÍÍ screen.
Press the [RxTx] key to swap the transmit and
receive lines to the Device. If characters are now
displayed on the 2nd line of the display, the transmit
and receive lines are swapped.
Press the [Tx+] key to reverse the transmit lines
(RS422 only) to the Device. If readable data is now
displayed on the 2
nd
line of the display, the transmit
lines from the Analyst to the Device are reversed.
RS232 ONLY-
Some devices require a DTR or RTS signal from the
controller to work. The DTR and RTS indicators on
the front of the Analyst will turn on when the DTR and
RTS signal lines from the Controller are “ON”.
When the DTR line is ON, some devices respond by
turning on the DSR line. When the RTS line is ON,
some devices respond by turning on the CTS line.
The DSR and CTS indicators on the front of the
Analyst will turn on when the DSR and CTS signal
lines from the Device are “ON”.
4 The top line of the display,
after
ÎÎ, shows readable
characters.
The 2 nd line of the display,
after ÍÍ, shows
unreadable characters.
The transmit circuit from the Controller to the Analyst
is working.
The transmit circuit to the Device, from the Analyst, is
working, but the transmit circuit may be reversed.
Press the [DIR] key to select the DIR ÎÎ screen.
Press the [Tx+] key to reverse the transmit lines
(RS422 only) to the Device (Device receive lines). If
readable data is now displayed on the 2
nd
line of the
display, the Device receive lines are reversed.
5 The top line of the display,
after
ÎÎ, shows readable
characters.
The 2 nd line of the display,
after ÍÍ, shows readable
characters.
The Controller can control
the Device.
The Controller is not
receiving a response from
the Device.
The transmit circuit from the Controller to the Analyst
is working.
The Device transmit and receive circuits are working.
The receive circuit from the controller to the Analyst is
not working.
Press the [DIR] key to select the DIR ÍÍ screen.
Press the [Tx+] key to reverse the transmit lines
(RS422 only) to the Controller (Controller receive
lines). If the Controller is now receiving responses
from the Device, the Controller receive lines are
reversed.