S2-3, S2-4, And S2-5 - Baud Rate Selection; Rs-232-C Interface Forward/Reverse; Channel Selection; Plato Channel Baud Rate Switch Selections - Control Data Corporation INFORMATION SYSTEMS TERMINAL II Hardware Maintenance Manual

TABLE 2-4. RS-232-C INTERFACE FORWARD/REVERSE
CHANNEL SELECTION
FORWARD REVERSE
PIN SIGNAL
SELECTED SELECTED
RJl-2
Forward XMT Dynamic Mark
RJl-14
Reverse XMT Mark Dynamic
RJl-4 Forward RTS
ON ON
RJl-19 Reverse RTS ON
ON
RJl-20 DTR* ON
ON
*Programmable, normally ON.
--
I
Once the parity generation/checking capability is enabled,
the processor can control whether this parity is even or
odd. See section 4, subsection Programming, for a further
explanation of the function of this switch.
S2-3, S2-4, and S2-5 - Baud Rate Selection
These three switches control the PLATO transmitter baud
rate. The settings for these switches are described in
table 2-5.
TABLE 2-5. PLATO CHANNEL BAUD RATE SWITCH SELECTIONS
S2-3
S2-4 S2-5
FREQUENCY
ON X* ON
75 bps
ON X* OFF
120 bps
OFF ON X* 1200 bps
OFF OFF X* External clock**
* X means that the position of that switch is
irrelevant.
** The external clock is brought in through RJl-15
(RS-232-C transmitter signal element timing) .
82100083 C 2-15