User Manual
© Sealevel Systems, Inc.  - 3 - 
PIO-48 User Manual
For high-current, high-voltage applications: 
  IDC 50 to IDC 50 Pin Ribbon Cable (Part Number CA167) 
−  40” cable connects the PIO-48 to solid-state relay racks equipped 
with 50-pin header interface. 
  IDC 50 to IDC 50 Pin Ribbon Cable (Part Number CA135) 
−  40” cable connects the PIO-48 to solid-state relay racks equipped 
with 50-pin edge connector. 
  Solid-State Relay Racks: 
•  Quad six position relay rack (Part Number PB24HQ) 
−  Relay rack can accept up to six QSSRs for a total of 24 channels. 
Features a 50-pin header connector for easy interface via 50-
conductor ribbon cables. 
•  Quad four position relay rack (Part Number PB16HQ) 
−  Relay rack can accept up to four QSSRs for a total of 16 channels. 
Features a 50-pin header connector for easy interface via 50-
conductor ribbon cables. 
  Quad Solid-State Relay Modules: 
•  AC Input (Part Number IA5Q) - Provides 4 channels of discrete I/O 
interface to monitor AC inputs up to 140V @ 10mA. 
•  DC Input (Part Number IB5Q) - Provides 4 channels of discrete I/O 
interface to monitor DC inputs from 3.3V to 32V. 
•  AC Output (Part Number OA5Q) - Provides 4 channels of discrete I/O 
interface to control AC outputs up to 140V @ 3A.   
•  DC Output (Part Number OB5Q) - Provides 4 channels of discrete I/O 
interface to control DC outputs up to 60V @ 3A.  
  Simulation/debug module (Part Number TA01) 
−  Module simulates the operation and load characteristics of a standard 
24-channel relay rack. An LED corresponding to each port bit 
illuminates to indicate state. Eight position DIP-switches are used to 
generate input status changes. 










