Configuration Switch SET S3 | Patton electronic 1080A-64 instruction

3.4 CONFIGURATION SWITCH SET “S3”

The DIP switches on S3 set the anti-stream control, local loopback enable, remote loopback enable and receive (input) impedance levels for the Model 1080A Series. Factory default positions of Switch S3 are shown in the table below.

S3 SUMMARY TABLE

Position	Function	Factory Default

S3-1	Input Impedance	On	} 200 Ohms
S3-2	Input Impedance	Off	} 200 Ohms
S3-3	Not yet assigned	n/a

S3-4	Mode Selection	On	Point to Point

S3-5	Local Loopback	Off	Disabled

S3-6	Remote Loopback	Off	Disabled

S3-7	Anti-stream Control	Off	} Disabled
S3-8	Anti-stream Control	Off

Switches S3-1 & S3-2: Input Impedance

The setting for Switches S3-1 and S3-2 determines the 1080A Series’ input impedance. This allows you to choose the optimum impedance setting for your application. In long distance applications the impedance of the cable must match the impedance of the load (or resistor) of the Model 1080A Series unit. Thicker gauge cables requires a lower Ohm setting, while a thinner gauge cable should receive a higher Ohm setting. If you are using higher speeds you will need a lower Ohm setting, and a higher Ohm setting for the slower speeds. Refer to the table on the following page for assistance in selecting a setting.

S3-1	S3-2	Setting
On	On	130 Ohms
On	Off	200 Ohms
Off	On	320 Ohms
Off	Off	High impedance (minimum 2kΩ )

S3-1, S3-2 SELECTION TABLE FOR MODEL 1080A

Gauge of					Data Rates, kb/s

Cable	1.2	1.8	2.4	3.6	4.8	7.2	9.6	14.4	19.2	28.8	38.4	57.6

19AWG/.9mm	320	320	200	200	200	200	200	130	130	130	130	130

22AWG/.6mm	320	320	320	200	200	200	200	200	130	130	130	130

24AWG/.5mm	320	320	320	320	200	200	200	200	200	130	130	130

26AWG/.4mm	320	320	320	320	320	200	200	200	200	200	130	130

S3-1, S3-2 SELECTION TABLE FOR MODEL 1080A-64

Gauge of	Data Rates, kb/s

Cable	16	32	64

19AWG/.9mm	130	130	130

22AWG/.6mm	200	130	130

24AWG/.5mm	200	130	130

26AWG/.4mm	200	200	130

Switch S3-4: Mode Selection

The setting for switch S3-4 allows the user to choose the appropriate setting for point-to-point or multipoint applications.

S3-4	Setting
On	Point-to-point
On	Multipoint application as “Master”
Off	Multipoint application as “Slave”

Switch S3-5: RS-232 Initiation of Local Loopback Test

The setting for switch S3-5 determines whether or not the Model 1080A Series’ local analog loopback test can be initiated by raising pin 18 on the RS-232 interface.

S3-5	Setting
On	RS-232 initiation enabled
Off	RS-232 initiation disabled