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14
S3-1: Input Impedance
The setting for switch S3-1, S3-2 determines the 1080ARC’s 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
1080ARC. 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. See Table 13 for more details on selecting
a setting.
S3-4: Mode Selection
The setting for switch S3-4 allows the user to choose the appropriate set-
ting for point-to-point or multipoint applications (see Table 15).
S3-5: RS-232 Initiation of Local Loopback Test
The setting for switch S3-5 determines whether or not the Model
1080ARC’s local analog loopback test can be initiated by raising pin 18
on the RS-232 interface (see Table 16).
Table 14:
Input Impedance Settings
S3-1 S3-2 Setting
On On 130 ohms
On Off 200 ohms
Off On 320 ohms
Off Off High impedance (minimum 2k-ohms)
Table 15:
Mode Selection Settings
S3-4 Setting
On Point-to-point
On Multipoint application as “Master”
Off Multipoint application as “Slave”
Table 16:
RS-232 Local Loopback Settings
S3-5 Setting
On RS-232 initiation enabled
Off RS-232 initiation disabled