System Configuration - Heathkit H14 Manual

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SYSTEM CONFIGURATION
HEATH SYSTEM CONFIGURATION
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Your Line Printer communicates with your computer
through a serial I/O card and may be operated at either
RS-232C signal levels (see Pictorial 2, Page 9) or at 20
rnA current loop levels (see Page 7). The 25-pin "D"
connector conforms to RS·232C standards and will
mate with most equipment which conforms to this
standard. Adaptor cables to convert from earlier
Heath equipment connectors to the RS-232C connec-
tors are available from the Heath Company.
Set the Line Printer baud rate (4800 is recommended).
Then set the Line Printer and the computer I/O card
(do not use the H8-5 Serial I/O card; the H8-4 Mul-
tiport Serial
110
card is recommended) for the same
type signal levels (RS-232C or 20
rnA
current loop) as
described in the following sections (RS-232C is re-
commended).
Refer to your serial interface manual for information
on how to set baud rates, addressing, vector inter-
rupts, and signal levels on the serial card. Refer to
your Software Manual under "System Configuration"
for information on where to set the serial and address
(PORT) and vector interrupt to communicate with
this Line Printer.
PRINTER BAUD RATE SELECTION
To select a desired baud rate, place sections 5, 6, and 7
of switch SW102 (located on the circuit board inside
your Printer) in the proper positions as indicated be-
low. The baud rate will be updated upon going from
"off line" to "on line," or during power up.
BAUD RATE SWITCH SECTION
5 6 7
110 1 1
1
150 0
1 1
300 1 0 1
600 0 0 1
.
1200
1 1 0
2400
0 1 0
4800
1 0 0
9600 (Do not use)
0 0
0
PRINTER SIGNAL LEVELS SELECTION
Wire your Printer for either RS-232C or 20 rnA current
loop operation as described below.
RS-232C Operation
To use the Printer on RS·232C operation, you must
install jumper wires between circuit board holes Jl14
and }115, and }109 and }110.
Proceed to the "Operation" section.
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