The Input/Output (I/O) Transmitter module provides an
interface between the I/O rack it resides in and an I/O
rack, downstream, up to 500 feet (150meters) away. The
features and benefits of this module are summarized in
This module is jumper selectable to work in either
NORMAL or EXPANDED I/O modes. The NORMAL
I/O mode allows 1 I/O chain per CPU (default setting).
The EXPANDED I/O mode allows up to 8 I/O chains (16
including AUX) per CPU. This feature yields a system
maximum of 16K I/O points (32K including AUX).
A DC-to-DC converter on the circuit board provides a
+5 Vdc supply voltage to circuits connected to the I/O
Bus. Consequently, I/O stations downstream from the
I/O Transmitter module are electrically isolated from I/O
stations upstream and the Series Six Central Processor
Refer to figure 1 (below) for I/O Transmitter module