Installation Manual

INS_FDX70E_REV–
03/01/12
PAGE 3
FIGURE 4 – DATA FORMAT SWITCH POSITIONS
TECH SUPPORT: 1.888.678.9427
INSTALLATION AND OPERATION MANUAL FDX70E(A,B)(M,S)1
Switch
Located on front panel.
The first two switches set the
data type, the third sets the
Master/Remote Mode.
RS232 Data
1 2 3
RS422, Bi-Phase or
Manchester Data
1 2 3
RS485
4-Wire Data
1 2 3
Remote Mode
1 2 3
RS485 2-Wire, Sensornet
Data
1 2 3
Master Mode
1 2 3
There are two virtual data channels shared between all FDX70E or FDX72 units in a system: a Master channel and a Remote channel.
The Master/Remote Mode switch sets the data channel used by the equipment connected to each FDX70E unit in the system.
The behavior of a Master and Remote depends on the data type (set by switches 1 and 2):
RS232, RS422, RS485 (4-wire)
One unit must be set to Master Mode, and the other unit should be set to Remote Mode.
When used here is no limit to the number of Masters or Remotes in a system as long as the connected equipment can handle
multiple Masters and multiple Remotes. Most applications requiring Master/Remote communications would use just one
Master and multiple Remotes. Masters can communicate with all Remote units, but not with other Masters. Remotes can
communicate with all Masters, but not with other Remotes.
RS485 (2-wire)
The concept of Master and Remote are not used with RS485 (2-wire) mode. Rather, the Master/Remote Mode switch simply
sets which of two independent data channels each unit will use. All Masters can communicate with each other, but not with
Remotes. All Remotes can communicate with each other, but not with Masters. When in RS485 2W mode, all units should be
set to the same mode.