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5.2 INTERFACE WITH PROGRAMMABLE CONTROLLERS
If the controller can accept 24 bits of BCD data (32 bits if other data is also
required), the 6-digit parallel BCD mode can be used.
In addressable 3-digit-at-a-time mode, only half of the I/O lines are required. In this
mode, digits 4, 5, and 6, Overflow, High, Low, and Go signals can be accessed on
the same lines of Digits 1, 2, and 3, D.P. 1, D.P.2, D.P. 4 and Polarity signals.
Parallel BCD board can be configured as an addressable 3-digit-at-a-time BCD as
follows:
1. Move U5A and U5B integrated circuits (IC) to U5B and U6B sockets.
2. Install a jumper on S2-B and S3-B.
The outputs can be enabled by an appropriate logic level on U24 and L24 pins of
P4 (see Table 3-1).
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