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.
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 |
| | | |
*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 |
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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.
TYPICAL MODEL 1008 APPLICATIONS
Switch | | Point-to-Point | | Multi-point |
| | | | | | | |
Settings | | | | | | | | |
| 4W | 4W HDX | | 2W | 4W | | | 2W |
| | | | | | | | |
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 |
| | | | | | | | |
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