IBM Series 1 User Manual page 145

Jumper Selections
Figure 4-7 shows the card jumper selections for the
teletypewriter adapter. All card jumper pins are located
in-line near the output edge of the installed card so they
can be read while the card is installed in an I/O card slot.
Generally, the most significant bit of the selection is the
highest of a group. Four groups are provided. From top to
bottom facing the installed card they are:
• Input selection, binary coded, most significant digit
to least significant digit (3).
• Bit rate selection, binary coded, most significant
digit to least significant digit (4).
• Device address, most significant hex digit (4) and
least significant hex digit (4).
• IPL selections, primary and secondary (2).
Jumper significance is as follows:
• Input selection jumper installed means that the
appropriate bit of the decode = logical 1. The decode
is as fa llow s:
Input Input
~~12
LS~ .§.~lecteg
i!!.i€trErSited~§
0 0 0
contact sense Closed=data mark
0 0
1
TTL Minus=data mar-k
0
1 0
ElA Minus-=data mar-It
0 1 1
Internal Time data out
1
0 0
Contact sense Open=data mar-X:
1
0
1
TTL Plus=data mark
1 1 0
EIA Plus=data
mark
1 1 1
Internal Time data out
The contact sense input, closed=data mark, is the
no-j umper default selection.
4-22
GA34-003:J