Switch S1-1 through S1-4
(Model 1184:): Async/Sync Data Rate
On Model 1184 Switches S1-1, S1-2, S1-3 and S1-4 set two
parameters: synchronous or asynchronous data rate and the maximum
transmission distance between two Model 1184s.
Data Max.
Distance
S1-1
S1-2
S1-3
S1-4 Rate (kbps) in miles (km)
On
Off
Off
On
0-19.2 3.0
(4.8)
Off
On
On
Off
4.8 3.0
(4.8)
Off
On
On
On
9.6
3.0 (4.8)
On
Off
On
Off
14.4
1.5 (2.4)
On
Off
On
On
19.2
3.0 (4.8)
Off
Off
On
Off
28.8
1.5 (2.4)
Off
Off
Off
Off
32.0
3.0 (4.8)
Off
On
Off
Off
56.0
1.5 (2.4)
Off
Off
Off
On
64.0
3.0 (4.8)
On
On
On
On
128.0
3.0 (4.8)
Position
Function
Factory Default
S1-1*
Data Rate
Off
S1-2*
Data Rate
Off
S1-3*
Data Rate
Off
S1-4*
Data Rate
On
S1-5
Clock Source
On
S1-6
Clock Source
On
S1-7
DTE Control of DL
Off
Disabled
S1-8
DTE Control of LAL
Off
Disabled
3.0 CONFIGURATION
Both Models 1184 and 1185 use a mini DIP switch package that
allows configuration to a wide range of applications. These switches
are located on the bottom side of the PC board. Figure 1 shows the
switch locations with respect to the other components on the PC board.
Because all eight switches are externally accessible, there is no need
to open the case to configure the unit.
3.1 CONFIGURATION SET “S1”
The switches shown in Figure 2 below and on DIP switch S1 are
used to set the async or sync data rates, LAL and DL diagnostic
functions and the clock mode setting. The default settings for DIP
switch S1 are shown in the table on page 6. Following the table are
detailed descriptions for each switch.
5
6
1184 AND 1185 S1 SUMMARY TABLE
}
64
kbps
Internal
}
}
Async
Setting
Sync
Settings
Figure 1. Underside of Model 1184/1185, Showing Location of DIP Switches
Figure 2. Close Up of Configuration Switches
ON
1 2 3 4 5 6 7 8
ON
OFF
ON
1
2
3
4
5
6
7
8
*NOTE: Both Models 1184 and 1185 use Switches S1-S4 to set the async or sync data
rate. Refer to the sections below to set the Model 1184 or 1185 rates.
