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1250 Controls and Indicators

Index Indicator Description

1 CHASSIS ADDRESS DIP switch which provides up to 8 chassis addresses

(refer to the instructions below).

2 POWER Indicates that power is being supplied to the unit.

3 NORMAL/SILENT Normal enables the ACO (Alarm Cut Off).

Silent disables the ACO.

4 ACO The Alarm Cut Off LED indicates that the alarm

relay contacts are disabled.

5 ALARM This LED indicates that an APS shelf alarm has

occurred.

6 FUSE ALARM This LED indicates that a bus fuse has blown.

7 3 AMP GMT Two 3 Amp fuse for power source A/B.

1557 Chassis Addresses

Chassis

Number

Base

Address

S2 S3 S4

10 to 27000

2 32 to 59 0 0 1

3 64 to 91 0 1 0

4 96 to 123 0 1 1

5128 to 155100

6160 to 187101

7192 to 219110

8224 to 251111

Chassis Address Selection

Each APS chassis must be assigned a block of addresses for its 1557 APS

cards so that the 1559 APS Manager may communicate with them. The DIP

switch located on the front panel of the 1250 Alarm and Power Card is used to

provide up to 8 chassis addresses. These addresses are used by the APSM to

poll and send commands to the 1557 cards.

Three out of the four switches (S2, S3, and S4) are set to one of the 8 possible

address codes as shown in the table to the right. The DIP switch positions are

number S1 through S4, with S1 on top and S4 on bottom. Note that S1 is not

used and must remain open to 0, which is the left switch position.

The first unit address (1557 card) in the chassis is the base address plus 1. For

example, if S2, S3, and S4 were all set to 0, the first unit address in the chassis

would be ‘1’ (0 + 1).

ALARM &

POWER

CHASSIS

ADDRESS

1234

–

POWER

NORMAL

SILENT

ACO

ALARM

FUSE

ALARM

3 AMP

GMT

1250

TRANSPORT

1 2 3 4 5 6 7 7

1250 Front View

NOTES: 1250 cards that are Rev. 2.63 or

higher add the capability to maintain alarm

card functions (front panel indicators, switch

functions, and relay operation) even when

Fuse A and B are open. This is possible

because these cards have the alarm circuitry

wired to the ‘hot’ side of the incoming A and

B external power source(s). In early revi-

sions, the 1250 alarm functions were only

operational if one or more of the front panel

fuses were functional (not blown).

Earlier versions of the 1250 card were called

1555P cards. The primary functions of both

cards are the same.

Figure 2 Power and Alarm Card Functions

1 2 3 4

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