Daktronics Galaxy AF-3400 20 mm Monochrome/RGB Double-face Displays - Manual (Page 31)

Signal Installation
23
4.8 Modem Communication
If the communication system works with a modem, look for:
• a modem (internal or external) at the computer that connects to a phone jack.
• a phone line connects to the display.
Connections
•
Computer modem (internal or external) to phone jack on wall − phone cable plugs into
both.
• Phone jack to modem at display − signal runs on local telephone lines.
• Modem board in enclosure to display − quick-connect cable from enclosure to top jack
on display side.
Troubleshooting
Components Check
Cable
Connections
•
The phone line is connected from the modem at the computer to the phone jack.
•
The two phone wires are connected at the modem board (Wire color is
determined by the phone company.)
•
The wires are making good electrical contact with the metal, no interference.
•
The quick-connect cable is connected from enclosure to top jack on display side.
Diagnostic
LEDs
•
The modem in the enclosure has the green LED on, indicating power.
•
The bottom red LED (carrier detect) is on when the modems are connected.
•
Transmit and receive LEDs flash when sending and receiving signal over the
telephone line; otherwise, they are off.
Display Power
•
The display is either running a message or showing a single pixel flashing in the
bottom right corner of the display when power is on.
Software
•
The software and the display are configured for dial-up communication and the
phone number is correct.
•
Refer to the software manual for other possible conditions.
Figure 25: Modem Communication Layout