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FiberLink 7240 Series User’s Manual
FiberLink 7240 Series
Protocol
1 2 6 7 8 9
RS-232
Off Off Off
Off Off Off
RS-422/485 (4-wire point-to-point
Off On Off
Off On On
RS-485 (4-wire mulitdrop)
On On Off
Off On On
RS-485 (2-wire auto xmit/receive)
On Off On
On On Off
Data Input/Output Plug-In:
Switches 1, 2, 6, 7, 8 and 9 are used to select the desired protocol . Positions for these are as
follows:
Switches 3, 4 and 5 are used only in the RS-485 configurations to select the auto time
interval that the unit will wait before switching back to the receive mode (tri-state).
The following table indicates switch positions for RS-485 protocol.
Baud
Rate
Time
3 4 5
2400
4 .73 mS
On
Off
Off
4800
2 .20
mS
On On Off
9600
1 .10
mS
On On On
19 .2K
620 uS
Off
On
Off
38 .4K
300 uS
Off
On
On
57 .6K
180
uS Off Off On
76 .8K
150
uS Off Off Off
Switch position 8:
When switch is on, then 120 Ohm termination is applied to data input.
Switch position 9:
When switch is on, then 120 Ohm termination is applied to data output .
System Switch Settings
The data interface circuit used in this product has external switches that are used to
configure the various signal options. These are preset to RS-232 at the time of shipment. If
changes are required, the positions of these switches must be changed in accordance with
the table below:
System Switch Settings
