Black Box ME500A, Manual, Page: 14 / 29

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CHAPTER 3: Configuration
Switch S2-8: V.54 Loopback Test Enable
This switch enables or disables V.54 looping in the Async/Sync Industrial Line
Driver.
S2-8 Setting
Off V.54 Normal Operation Enabled
On V.54 Testing Disabled
3.4 Configuration Switch Set S3
The DIP switches on S3 set the anti-stream control, timing mode, topology, local
loopback enable, remote loopback enable, and input impedance levels for the
Async/Sync Industrial Line Driver. Factory-default positions are shown in the table
below.
Table 3-4. S3 switches
Position Function Factory Default
S3-1 Input Impedance On
S3-2 Input Impedance Off 200 ohms
S3-3 Timing Mode Off
S3-4 Topology On Point-to-point
S3-5 Local Loopback Off Disabled
S3-6 Remote Loopback Off Disabled
S3-7 Anti-Stream Control Off
S3-8 Anti-Stream Control Off Disabled