Harris Intraplex STL-160 Series - Table 3-6. MA-235-1 Switch 1 Functions and Settings; Table 3-7. MA-235-2 Switch 1 Functions and Settings

3 – Installation & Wiring ACS-160 Series & STL-160 Series T1 Multiplexer Installation & Operation
Version 2.11, August 2011
Harris Corporation 3-9
Intraplex Products
Figure 3-8. MA-235-1 and MS-235-2 Face Plates and Connector Locations
Each module adapter has a DIP-style switch for system setup. Table 3-6 shows the MA-235-1 Switch 1
functions and settings, and Table 3-7 shows the MA-235-2 Switch 1 functions and settings. You must
configure these switches before installing the module adapters in the shelf.
Table 3-6. MA-235-1 Switch 1 Functions and Settings
Positions
Factory
Default Description
1 On This switch position controls the external timing input impedance (120 ohms; TIMING
IN port). This switch is normally set to On. When using a daisy chain configuration, the
last multiplexer in the chain should have this switch On, and the others should be Off.
2 On This switch controls the input impedance of the time delay control port when using the
optional time delay capability. It is normally set to On.
Table 3-7. MA-235-2 Switch 1 Functions and Settings
Positions
Factory
Default Description
1 and 2 On Operating Mode: TERM = SW 1, Position 1 and Position 2 both On
DI-A = SW 1, Position 1 On and Position 2 Off
DI-B = SW 1, Position 1 Off and Position 2 On
SPARE = SW 1, Position 1 and Position 2 both Off
3 On Not used
4 and 5 On This switch position controls the bias of the RS-485 portion of the remote port (used
for daisy chaining remote ports). For normal operation, Switch 1, Position 4 and 5
should both be set in the On (bias) position. When using a daisy chain configuration,
two module adapters in the chain should have these switches On and the others should
be Off. Note that Positions 4,5,6 should be set as a group (that is, all On or all Off).
6 On Switch 1, Position 6 controls the termination impedance (120 ohms) for the RS-485
portion of the remote port. This Switch 1, Position 6 should be set in the On position.
When daisy chaining, the last multiplexer in the chain should have this switch on, and
the others should be Off. Note that Positions 4,5,6 should be set as a group (that is, all
On or all Off).