91369 Service Manual 3-21
Theory
Parameter Modules
Any single-high Spacelabs Healthcare parameter module can be inserted into the module slot of the monitor.
The module receives +5 VDC, +12 VDC, and -12 VDC power from the monitor and communicates with the
monitor via an SDLC data bus. In the most general terms, the module initially downloads a program (“table
code”) into the monitor over the SDLC bus. This enables the monitor to interpret messages from/to the module.
The module sends events and data to the monitor, which typically cause the monitor to display waveforms,
keys, etc. The monitor also responds to key presses of the module’s keys, which causes various actions to
occur, such as changing the way data is displayed.
For more information on the SDLC data bus, refer to SDLC Interface on page 3-11.
The theory of operation of a particular module can be found in that module’s service manual.
CPU PCBA Connectors
Table 3 provides a summary of all CPU PCBA connectors.
Table 3: CPU PCBA Connectors
Reference Connector Type Description
J191 RJ45/external Ethernet connector
J291 USB (single)/external Keyboard/mouse/standard USB
J391 USB (dual)/external Keyboard/mouse/standard USB
J560 80-pin/internal Interconnect PCBA
J941 0.1 ctr 10-pin/internal Alarm connector
P590 2 × 5 header/internal USB header
P710 0.1 ctr 10-pin/internal Jtag port
P960 2 × 8 header Development Port
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