Port 1 is dedicated to the local printer. Therefore, the following switches on switch packages J2 and J3 should
ALWAYS be CLOSED:
J2 -- switches 1 and 3
J3 -- switch 2
The selection of switches for Port 2 depends on the peripheral device being used. If Port 2 is being used for any
of the following devices, the switches should be set as shown in Figure 4:
- Model 43 Teletype - G.E. Terminette - ADDS CRT
OR
-
Any peripheral device requiring the Data Terminal Ready signal to be normally HIGH, and LOW when
busy.
OR
- Any peripheral device NOT using the Data Terminal Ready signal.
52
l
Switch package J2
CLOSE switches 5 and 8
l
Switch package J3
CLOSE switch 7
FIGURE 4
8
53
If Port 2 is being used for a Centronics 150 terminal, or for any peripheral device requiring the Data Terminal
Ready signal to be normally LOW, and HIGH when busy, set the switches as shown in Figure 5.
l
Switch package J2
CLOSE switch 7
l
Switch package J3
CLOSE switches 7 and 8
J2
53
FIGURE 5
If Port 2 is being used for 20-mA current loop operation, set the switches as shown in Figure 6.
l
Switch package J2
ALL switches OPEN
l
Switch package J3
ALL switches OPEN
52
FIGURE 6
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