Daktronics CE-1010 - Manual (Page 64)

RS422 Loop-Back Test (Outdoor Displays)
Note: This test should be performed with only one jack at a time. Do not connect a loop-back
to more than one jack at a time.
Serial Cable (W-1249)
To complete the test, the serial cable must be plugged into the signal converter. The table
below lists the pin connections when using a serial cable (Daktronics part# -1249).
DB9-F DB25-F
Pin 3 – TX Pin 2 – TX
Pin 2 – RX Pin 3 – RX
Pin 5 – GND Pin 7 - GND
Figure 3: Jumpers at RS232/RS422 Signal Converter
Loop-Back Test: To perform a loop-back for
testing purposes only, use the spare plug in the
signal converter and connect the copper conductor
jumpers using the following table. Refer to
Figure 3 . (To eliminate the display, pull out the
phoenix plug with the signal wires connected into
it.)
J2 and J3 J4 and J5
(Pin 5) TX-N to
(Pin 3) RX-N
OR (Pin 2) RX-P to
(Pin 4) TX-P
(Pin 4) TX-P to
(Pin 2) RX-P
(Pin 3) RX-N to
(Pin 5) TX-N
Figure 4: Jumpers at Surge
Board
When the wires are connected, perform the loop-back test using the
Venus 1500 software as described in Conducting the Venus 1500
Software Test
This test can also be done at the signal termination enclosure on the
surge board assembly, as shown in
Figure 4 , or, on some displays, at the
controller board input. In that case, the wires coming from the signal
converter must remain connected, and the jumpers will be inserted
along with them. Leave the plug disconnected from the surge board
while conducting the test.
TB1 - RS422 In
(Pin 4) RX-P to
(Pin 2) TX-P
(Pin 5) RX-N to
(Pin 3) TX-N
When the wires are connected, perform the loop-back test using the
Venus 1500 software as described in Conducting the Venus 1500
Software Test
6/30/2004
ED-14413
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