If a port is to be used for 20-mA current loop operation, the J3 switch setting for that port will be ignored by the
system (J2 switch settings OVERRIDE J3 settings).
CLOSED
ALWAYS CLOSED
Close when DTR signal LOW (HIGH when busy)
Close when DTR signal HIGH (LOWwhen busy)
ALWAYS CLOSED
Close when DTR signal HIGH (LOW when busy)
ALWAYS CLOSED
Close when DTR signal LOW (HIGH when busy)
ALWAYS CLOSED
53
PORT 1 OR 3
M1
o-/-o2
ti*3
-4
e*”
-6
ti-07
-6
PORT 2 OR 4
OPEN
ALWAYS CLOSED
Open when DTR signal HIGH (LOW when busy)
Open when DTR signal LOW (HIGH when busy)
ALWAYS CLOSED
Open when DTR signal LOW (HIGH when busy)
ALWAYS CLOSED
Open when DTR signal HIGH (LOW when busy)
ALWAYS CLOSED
Note: DTR = DataTerminal Ready
FIGURE 9
Switch package J4 (Figure 10) is used to address the RS232C ports. On the first board, CLOSE switches 1, 3,
and 4; OPEN switches 2 and 5. The local printer is ALWAYS connected to Port 1 of the first RS232C board.
If a second RS232C board is equipped, CLOSE switches 2 and 5; OPEN switches 1,3, and 4.
CLOSED
on 1 st board
on 2nd board
on 1 st board
on 1 st board
on 2nd board
not used
OPEN
on 2nd board
on 1 st board
on 2nd board
on 2nd board
on 1 st board
not used
FIGURE 10
17
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