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ISOLATED PARALLEL BCD OPTION
1.0 GENERAL INFORMATION
The optional parallel BCD board works concurrently in two output modes: 6-digit
parallel BCD (24 lines) and addressable 3-digit. In addition to the 6-digit BCD, this
board outputs the alarm condition (High, Low and Go), polarity, overflow, and
decimal point binary address signals. The outputs are three-state and electrically
isolated from the main board. They are active when the appropriate address is
applied on connector P4, pins L24, U24, L23, and U23. The inputs are internally
connected to the main board via the interconnection of P5 with J5.
Outputs are available on P4, a 50-pin dual-row header at the rear of the board. The
P4 mates with a standard, 50-pin mass-terminated connector. The P4 outputs can
be frozen by making the HOLD input (P4-U21) low. Although the BCD outputs are
always valid, the DATA READY signal goes active low for approximately 0.2
millisecond when BCD data is updated.
2.0 MECHANICAL INSTALLATION
The parallel BCD board is positioned as an upper board in the P6000A/P5000.
Refer to the exploded view in the main board manual.
To avoid electrical shock be sure to disconnect the unit from its power supply.
To install:
1. Hold the board upside-down with components facing the main board.
2. Position the P5 pins to mate with the J5 connector on the power supply
board.
3. Push the board downward until it rests on the upper rear panel and the
display board.
3.0 ELECTRICAL CONNECTIONS
NOTE: The software switch SS3 of Configuration 2 must be set (XXX1XX)
to activate the parallel BCD board. For more information, refer to
Section 4.1 of the P6000A/P5000 main board manual.
3.1 POWER
A n is olat ed + 5 V ±10% ext ernal power supply is required and s hould be c onnect ed t o pi n
P4-L21 (+5 V) and pin P4-L19 (ISO GND). If isolation is not required, S5A, S5B, S6A, and
S6B may be installed to power the parallel BCD option by the main board.
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