Chapter 3 | Ttl Output Setting - MED Associates SG-231 User Manual

M E D A S S O C I A T E S , I N C .

CHAPTER 3 | TTL OUTPUT SETTING

The SG-231's TTL logic jumper is factory set to the Active Low (connecting pins 1 and 2).
In the Active Low position the TTL signal will be HIGH (~5V) when OFF and LOW (~0V) when operated.
To change the TTL logic jumper to the Active High (connecting pins 2 and 3), remove the 2 screws from
the bottom of the SG-231 and lift the top cover off. Near the center of the printed circuit board is
jumper location JP1, see Figure 3-1.
Figure 3-1 – TTL Logic Jumper
Remove the jumper and reposition it to cover pins 2 and 3 as shown in Figure 3-2.
In the Active High position the TTL signal will be LOW (~0V) when OFF and HIGH (~5V) when operated.
Figure 3-2 - Active High Jumper Setting
S G - 2 3 1 2 8 V D C T O T T L A D A P T E R
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DOC-203 Rev. 1.5 Copyright © 2019
Med Associates, Inc.