Switch package Jl (Figur-,; 7) is used to select the baud rate for each port. There are three baud rates available
to the system. See the CPU board, jumper package Jl (Figure l), to determine the baud rates for the LOCAL
and REMOTE ports.
Set the switches on switch package Jl as follows:
PORT 1 OR 3
Baud Rate 1 = CLOSE switch 7
Baud Rate 2 = CLOSE switch 5
Baud Rate 3 = CLOSE switch 3
PORT 2 OR 4
Baud Rate 1 = CLOSE switch 8
Baud Rate 2 = CLOSE switch 6
Baud Rate 3 = CLOSE switch 4
&, UNUSED
BAUD 3 PORT 1 OR 3
BAUD 3 PORT 2 OR 4
BAUD 2 PORT 1 OR 3
BAUD 2 PORT 2 OR 4
BAUD 1 PORT 2 OR 4
FIGURE 7
CAUTION: If you close more than
two switches on Jl , you will destroy the CPU board’s baud rate generator!
Switch package 52 (Figure 8) selects either RS232C or 20-mA current loop operation FOR BOTH PORTS ON
THE RS232C BOARD. Set the switches as shown in Figure 8.
52
CLOSE
OPEN
CLOSE if port 1 or 3 is RS232C
C
1
OPEN if port 1 or 3 is 20 MA. cunent loop
CLOSE if port 2 or 4 is RS232C
C
1
OPEN if port 2 or 4 is 20 MA. current loop
FIGURE 8
Switch package J3 (Figure 9) is used to select the status of the Data Terminal Ready (DTR) signal. Set the
switches as indicated below for the peripheral device being used.
MODEL 43 TELETYPE, G.E. TERMINETTE, ADDS CRT,
Port 1 or 3, CLOSE switches
LOCAL PRINTER, CASSETTE TAPE UNIT
Any device requiring Data Terminal Ready to be normally HIGH
1
1,3, and 4 and OPEN switch 2
(LOW when busy)
Port 2 or 4, CLOSE switches
Any peripheral device NOT using Data Terminal Ready signal
5,6, and 8 and OPEN switch 7
Port 1 or 3, CLOSE switches
CENTRONICS 150
1
1,2,4 and OPEN switch 3
Any device requiring Data Terminal Ready to be normally LOW
(HIGH when buffer is full)
Port 2 or 4, CLOSE switches
6,7, and 8 and OPEN switch
5.
18
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