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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
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
Setting
On Controlled by RTS
Off Constantly ON
S2-2: RTS/CTS Delay
The setting for switch S2-2 determines the amount of delay
between the time the Model 1008 “sees” RTS and when it sends CTS.
Note: RTS/CTS Delay setting should be based upon transmission
timing.
S2-2
Setting
On 8 mSec
Off no delay
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 1008’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
S2-4 Setting
On On Intermediate Impedance
Off Off High Impedance
3.2 TYPICAL APPLICATIONS
The Model 1008 is commonly used in five types of applications:
4-wire/full duplex/point-to-point, 4-wire/half duplex/point-to-point,
2-wire/half duplex/point-to-point, 4-wire/multipoint and 2-wire/multipoint.
The switch settings
generally
needed to configure the Model 1008 for
these applications are shown in the table below. Note: Do not change
switch settings until you have
carefully
read Section 3.1.
7 8
S1-1: Rcv Impedance ON ON ON Master - ON
Slaves - OFF
Last Slave - ON
S1-2: 2-wire/4-wire OFF OFF ON OFF ON
S1-3: 2-wire/4-wire OFF OFF ON OFF ON
S1-4: Echo OFF OFF OFF OFF OFF
S2-1: Carrier Control OFF ON ON Master-OFF ON
Slaves-ON
S2-2: RTS/CTS Delay ON ON ON OFF ON
S2-3: “Xmt Off” Imp. OFF OFF OFF OFF OFF
S2-4: “Xmt Off” Imp. OFF OFF OFF OFF OFF
TYPICAL MODEL 1008 APPLICATIONS
Point-to-Point
Switch
Settings
Multi-point
4W 2W 4W 2W4W HDX
SWITCH S2 SUMMARY TABLE (factory defaults in bold)
Position Function ON Position OFF Position
S2-1 Carrier Control RTS Constantly ON
S2-2 RTS/CTS Delay 8 mSec No Delay
S2-3*
“XMT Off” impedance Intermediate High
S2-4*
“XMT Off” impedance Intermediate High