Rockwell Automation 2706-P42_P43_P44_P72_P74_P92_P94 InView Marquee Message Display User Manual - Manual (Page 37)

Publication 2706-UM016D-EN-P - March 2006
Install InView Marquee Message Display 1-29
Global Addressing
The 2706-P92C and 2706-P94C displays can both set their serial
address to 255, which is the global (broadcast) address. A display with
the serial address of 255, accepts all message packets regardless of the
address actually given in the packet. This allows the user to route all
messages to the 2706-P9x InView display.
See Dip Switch Information for the 2706-P9x in Chapter 2, for serial
address configuration.
Ground and Terminate the
RS-485 Network Only one device at either end of the link must have earth ground and
shield jumpered together. This provides an earth ground connection
for the shield of this communication cable. If the connection is made
at an AIC or AIC+, jumper terminals 1 and 2. If the connection is made
at a 2706-P4x or 2706-P7x display, jumper terminals 1 and 8. If the
connection is made at a 2706-P22 display, jumper terminals 1 and 2.
Both ends of the network must be terminated. There is an impedance
of 120 ohms built into each AIC and AIC+ as required by the RS-485
specification. Jumper terminals 5 and 6 of the AIC or AIC+ for
end-of-line termination.
End-of-Line Termination for AIC and AIC+
TIP
A global address of 255 can only be set by hardware
and cannot be set using software.
Jumper
Jumper
Belden #3106A or #9842 Cable
1219 m (4000 ft) Maximum