Specifications

Appendix 53
Networking Alpha Signs (9700-0112C) October 8, 2003
Appendix D—Setting the RS232/RS485 jumper
Typically, if only one sign will be connected to a PC, the sign’s jumper is set to RS232. When connecting
multiple signs, each sign’s jumper should be set to RS485. Some Alpha signs have an RS232/RS485 auto-sensing
port that sets the jumper automatically, and not all signs have jumpers. See“Appendix E—Serial and power
connections” on page 55 for more information.
NOTE: Make sure the power to the sign is off before changing the position of the jumper.
Series 4000 and 7000 signs
Director sign
Contact with high voltage
may cause death or serious
injury.
Always disconnect power to
unit prior to servicing.
Hazardous voltage.
WARNING
SM1000A
232 485
jumper
position
RS232
232 485
jumper
position
RS485
232 485
232 485
Remove the sign’s cap by
removing these two screws.
Lift the cap off.
Remove the plastic lens
from the front of the sign
by pulling it up. Then set
the RS232/RS485 jumper.
When the jumper is on
the left two pins, the
sign is set to RS232.
When the jumper is
on the right two pins,
the sign is set to
RS485.
NOTE: This information applies to
the wood Director only. You do
not have to set the jumper in the
aluminum Director as it is set
automatically.