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2
J2
These connections provide the RS-232 level signals that are usually connected to a DB-9 serial connector as
indicated in the table. Note that pin 5 of the DB-9 must be connected to the same ground as the interface board
itself.
J2 Signals
Signal
Direction
DB-9 Pin
Description
TxD
Output
2
Transmit Data
RxD
Input
3
Receive Data
DTR
Input
4
ATN signal
Common
5
RS-232 ground
J3, J4
Either of these connections may be used to convey power to the Module. Note that J3 and J4 are oriented
backwards with respect to one another. In most cases, you will choose to use either J3 or J4, but not both,
depending on how you connect the Module to the external circuitry.
The physical spacing of the holes of J1, J2, J3 and J4 is designed to mate to a standard solderless breadboard
that has an array of holes on 0.100” centers. The spacing between the holes of J1/J2 and the closest hole of
J3/J4 is 0.300”. Note that the holes of J3/J4 align with the outermost holes of J1. Although many or most
solderless breadboards are compatible with this physical layout, not all are so you’ll need to check yours
carefully before attempting to install the Module on the solderless breadboard. The picture below shows the
Module with square pins installed and plugged into a compatible solderless breadboard.
ZX-28 Interface Module Connected to a ZX-328n on a Solderless Breadboard
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