ON
Figure 2. Close up of DIP switches showing ON/OFF positions.
4.1.1 SWITCH SET SW1
The configuration switches on switch set SW1 allow you to specify Line Rate, Circuit Assurance, RTS, Character Length, Data Format and DSR Loop Status. Figure 3 (below) summarizes SW1 switch settings, including the factory defaults. Following Figure 4 is a description of each switch setting.
| SWITCH SET 1 SUMMARY TABLE |
| ||
Position | Function | Factory Default |
| |
Switch | Line Rate | Off | } 56,000 bps |
|
Switch |
| On |
| |
Switch |
| On |
|
|
Switch | Circuit Assurance | Off | Disabled | Model 2510 Enabled |
Switch | RTS | Off | Forced On |
|
Switch | Character Length | Off | 10 Bit |
|
Switch | Data Format | Off | Synchronous |
|
Switch | DSR Loop Status | Off | DSR Off |
|
|
|
|
|
|
Figure 3. Summary of switch settings, showing factory defaults
Line Rate
These switches control the signalling rate on the line
Setting | |||
On | On | On | 2.4 kbps |
On | On | Off | 4.8 kbps |
On | Off | On | 9.6 kbps |
On | Off | Off | 19.2 kbps |
Off | On | On | 56 kbps |
Off | On | Off | 64 kbps |
Off | Off | Off | Force configuration pointer to |
|
|
| default to hardware switches |
|
|
| (See Section 4.2) |
(continued)
For line rates of 56 and 64 kbps, it is possible to operate the DTE interface at a lower rate. To do this, set these switches to 56 or 64 kbps and set the Rate Converter/DTE Rate switches as required.
Circuit Assurance
On dedicated circuits, the transmitter and the CTS output can be configured to go On only when a working communication circuit is established. If Circuit Assurance is used, enable it on only one end of the communication link. In Switched 56 mode, this switch should be set to On on both ends of the circuit.
| Circuit |
|
Assurance | Description | |
On | Enabled | CTS will go low and the |
|
| transmitter will be held off if the |
|
| receiver is in the No Signal state |
|
| or CD is low |
Off | Disabled | The transmitter and CTS will |
|
| operate without regard to the |
|
| receiver state |
RTS
The RTS input can be forced on, ignoring the terminal’s RTS signal. RTS controls the transmitter by either sending the user’s data or sending an idle code. Force RTS should be enabled in Switched 56 mode.
RTS | Description | |
Off | Forced On | An On (high) condition is trans- |
|
| mitted regardless of the state of |
|
| this unit’s RTS input |
On | Follows DTE | The RTS input controls the |
|
| transmitter |
Note: At 64K line rate, RTS is always Forced On.
9 | 10 |