Installation
2-3
1558A APS
2.4.5
COM Bus Connections
The rear panel COM BUS connectors (IN/OUT) are used to
communicate to/from the optional APS 1559 site manager.
These connections are only used when a 1559 Network
manager is co-located with the 1558A(s). Bus connections
from the manager to one or more 1558A units is done in a
daisy chain fashion. That is, the COM BUS Out from the
1559 is connected to the COM BUS IN of the 1558A and
the COM BUS OUT of the 1558A is connected to the COM
BUS IN of the 1559. Physically, the connections to the
COM Bus IN/OUT are RJ11, 6-pin miniature modular
jacks. The function of the six pins associated with the jacks
are shown below.
2.5
Configuration Modes
Any time that the 1558A unit is initialized (power removed,
then reapplied), all key configuration data is read by the
1558A CPU and implemented based upon the particular
configuration boot mode options selected by the user. There
are four possible configuration boot modes:
• Configure/Boot from Switches (refer to
Section 2.5.1
).
• Configure/Boot from ROM (refer to
Section 2.5.2
).
• Configure/Boot from RAM (refer to
Section 2.5.3
).
• Configure/Boot from Manager. This requires the optional
1559 manager (refer to
Section 2.5.4
).
The following sections describe how to set up the 1558A to
boot using one of the above modes as well as other general
operating parameters.
NOTE: All factory default settings in this manual are
shown underlined.
2.5.1
Switch Configuration
After the equipment has been unpacked and inspected and
mounted, the next step is to configure the unit. All unit
options are set by the switch positions on four 8-position
DIP switches (S1, S2, S3 and S4) on the rear of the 1558A
unit. The 1558A is shipped from the factory with all option
switches in the OFF (factory default) position. The follow-
ing paragraphs briefly describe the 1558A option switches.
NOTE: After all of the option switches have been set to
the desired mode of operation, recycle the power to the
unit. At power up, the CPU will read and implement the
switch settings selected by the user.
Option Switch S1
This 8-position DIP switch is used to set the following unit
options:
• Block/Pass ESF data link configurations
• Regeneration or Pass CRC
• Master or Slave Card Operation
• Boot alarm parameters from ROM or RAM
• Boot general parameters from Switches, ROM, RAM, or
Manager
The following table describes the DIP switch settings con-
trolled by Switch S1.
Option Switch S2
This 8-position DIP switch is used to set the following unit
options:
• Alarm on Framing Errors
8
Not
Used Not
Used
PIN
COM BUS IN
COM BUS OUT
1
Not Used
Not Used
2
Signal Ground
Signal Ground
3
Data, output
Data, Output
4
Data, input
Not Used
5
Signal Ground
Signal Ground
6
Not Used
Not Used
Pin
NET A & B, RJ48
DTE RJ48
Position
Switch S1 Description
1
OFF = DTE/NET, Block Data Link
ON= DTE/ NET, Pass Data Link
2
OFF= NET/DTE, Block Data Link
ON= NET/DTE, Pass Data Link
3
OFF = DTE/NET, Regen. CRC
ON= DTE/NET, Pass CRC
4
OFF = NET/DTE, Regen. CRC
ON= NET/DTE, Pass CRC
5
OFF = Card Function, Slave
ON= Card Function, Master
6
OFF = ARM from ROM
ON= ARM from RAM
7,8
OFF,OFF = Boot from Switches
OFF,ON = Boot from Manager
ON,OFF = Boot from RAM
ON,ON = Boot from ROM
