S1 Positions 1 through 4: Data-Rate Setting
determines the data rate (valid for both synchronous and asynchronous protocols) of the Multi-Function LD Card.
S1-1
S1-2
S1-3
S1-4
Setting:
ON
ON
ON
ON
1200 bps
OFF
ON
ON
ON
1800 bps
ON
OFF
ON
ON
2400 bps
OFF
OFF
ON
ON
3600 bps
ON
ON
OFF
ON
4800 bps
OFF
ON
OFF
ON
7200 bps
ON
OFF
OFF
ON
9600 bps (default)
OFF
OFF
OFF
ON
14.4 Kbps
ON
ON
ON
OFF
19.2 Kbps
OFF
ON
ON
OFF
28.8 Kbps
ON
ON
OFF
OFF
38.4 Kbps
OFF
ON
OFF
OFF
57.6 Kbps
S1 Positions 5 and 6: Clock Source
determine which transmit-clock source the Multi-Function LD Card uses.
S1-5
S1-6
Setting:
ON
ON
Internal transmit clock (default)
OFF
ON
Receive-recover clock
ON
OFF
External transmit clock
S1 Position 7: Protocol
determines whether the Multi-Function LD Card operates synchronously or asynchronously.
S1-7
Setting:
ON
Asynchronously (default)
OFF
Synchronously
S1 Position 8: Carrier-Control Method
determines whether the carrier is "constantly on" or "controlled by RTS". In the "controlled by RTS" setting, the Switch can support switched-carrier, multipoint, or hardware flow-control applications.
S1-8
Setting:
OFF
Constantly ON (default)
ON
Controlled by RTS
Configuration Switch "S2"
Use the individual positions on DIP switch S2 to set word length, signaling-rate range, RTS/CTS delay, or 2- or 4-wire operation, as well as to control diagnostic testing. The factory-default settings are summarized in the table below.
Position
Function
Default Settings
S2-1
Not Used
N/A
S2-2
2-Wire/4-Wire
Off
4-Wire
S2-3
V.52, V.54 Tests
Off Normal Operation
S2-4
S2-5
RTS/CTS Delay
RTS/CTS Delay
On
7 ms
On
7 ms
S2-6
Signaling-Rate Range
On
-2.5 to +1%
S2-7
S2-8
Word Length
Word Length
Off
10 bits
Off
10 bits
