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3.1.3 DIP SWITCH S2 SETTINGS
DIP switch S2 is used to configure carrier control, RTS/CTS delay
and communication protocol. The summary table below shows the
factory default settings for switch S2. Following the summary table is a
SWITCH S2 SUMMARY TABLE (factory defaults in bold)
Position
S2-1
S2-2
S2-3*
"XMT Off" impedance
S2-4*
"XMT Off" impedance
detailed description of each individual switch.
*Note: Switches S2-3 and S2-4 should be switched simultaneously
S2-1: Carrier Control Method
The setting for switch S2-1 determines whether the carrier is
"Constantly On" or "Controlled by RTS". This setting allows for
operation in switched carrier, multipoint and/or hardware handshaking
applications.
S2-1
On
Off
S2-2: RTS/CTS Delay
The setting for switch S2-2 determines the amount of delay
between the time the Model 2089 "sees" RTS and when it sends CTS.
Note: RTS/CTS Delay setting should be based upon transmission
timing.
S2-2
On
Off
S2-3 and S2-4: "Transmit Off" Impedance
Switches S2-3 and S2-4 are set together to determine whether the
receiving device "sees" the impedance of the Model 2089's transmitter
as being "high" or "intermediate" when the transmitter is turned off. The
"intermediate" setting is useful in half-duplex environments where the
receiving device does not respond well to the "high" setting.
S2-3
On
Off
Function
Carrier Control
RTS/CTS Delay
Setting
Controlled by RTS
Constantly On
Setting
8 mSec
no delay
S2-4
On
Off
OFF Position
Constantly ON
No Delay
High
High
Setting
Intermediate Impedance
High Impedance
7
ON Position
RTS
8 mSec
Intermediate
Intermediate
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