MDR24X User’s Manual
10/26/2006
7
1.3
MDR24X Interface
MDR24X transceivers support RS-232/ RS-485 (2-wire Half Duplex) protocols. In a cabled
environment, the RS-485 protocol can tolerate high noise and push signals over long cable
lengths. RS-485 cabling can also communicate as far as 4000 feet (1200m) and offer multi-drop
capability where up to 32 nodes can be connected. RS-232 cabling is suitable for distances less
than 100 feet (30.5m) and only supports point-to-point communications. MDR24X transceivers
offer performance improvements over a standard cabled link. Distance and multipoint
communications are greatly enhanced. A selection of RS-232/RS-485 can be made when
ordering the MDR24Xs.
Figure 1- MDR24X Front View
MDR24X Status LEDs
LED
Color
Description
Pwr Green
On indicates that the unit is powered up.
Link Red
On indicates the Client unit(s) and Server unit are in range of one
another. Link LED remains activated on Server units. Client units
activate the Link LED when in range of the Server unit.
Rx Green
When flashing, LED indicates MDR24X unit is receiving data.
Tx Red
When and flashing, LED indicates MDR24X unit is sending data.
RPSMA Antenna Connector
Status LEDs
Pwr
Link
Rx
Tx
