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8 - Connecting SMD hardware
Output Ports
Station Master Deluxe provides twenty (20) relay outputs. They are physically located on the two rear panel
DB25 connectors - PORT A and PORT B. The connections are described in Appendix A.
PORT A
Has a common terminal and ten (10) relay outputs. The
common terminal can be configured for internal or external
power and source or sink by selecting the appropriate
jumpers.
The EXT position connects the common terminal to the
special "input" pin on the PORT A connector. This pin is
used for a POSITIVE external control voltage.
The INT position connects the common terminal to the
SRC/SNK jumper. In the SRC position, the common
terminal is connected to Station Master's power supply
(+13 Volts); in this configuration the outputs are voltage
Simplified schematic of PORT A
sourcing. In the SNK position, the common terminal is
connected to Station Master's ground; these outputs are sinking (switch to ground). Total current (source or
sink) for all active outputs is 1 A.
PORT B
Has six (6) outputs with single common terminal
(B1-B6) and four (4) outputs (B7-B10) with isolated
contacts. The common terminal of relays B1-B6 can
be configured for internal or external power and
source/sink operation by using the PORT B jumpers
in the same manner as the PORT A jumpers. Total
current (source or sink) for all active outputs is 400
mA.
Outputs B7-B10 can be connected to the same
common as B1-B6 by connecting pins 19, 20, 21,
and 22 respectively to pin 17.
Simplified schematic of PORT B
NOTE: The default factory settings for both PORT A and
PORT B are INT / SRC (internal sourcing).
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