DNF Controls Analyst, RS422/RS232 Tester - Manual (Page 12)

SENDER/RECEIVER Mode Troubleshooting Tips
Received Test Message What it means
Receive readable test message with
Receiver’s ID added.
Confirms that receive circuit from RECEIVER to
SENDER is working.
Also confirms that message received was same as
message sent. Positive proof that both ends of the
cable are connected to the same cable. Eliminates
the possibility of crossed cables.
Receive ID from RECEIVER is readable
but the original test message is
unreadable.
The receive circuit is working.
The transmit circuit may be reversed.
Press the [Tx+] key to reverse the transmit lines
(RS422).
If the original test message is now readable, the
transmit lines are reversed.
Receive unreadable test message. The receive circuit may be working.
Press the [Rx+] key on the SENDER to check for
reversed receive lines (RS422).
If received test message is now readable, the
received lines are reversed.
If the received test message contains the original
test message, the transmit circuit is working.
No received test message. The receive circuit is not working.
Press the [RxTx] key on the SENDER to swap the
transmit and receive circuits.
If a test message is received, the transmit and
receive lines are swapped.
Page 8 of 31 The Analyst RS422/RS232 Tester