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  Home >  Electronics > Serial to Parallel Converter
 
Serial to Parallel Converter Module
Serial to Parallel Converter Specifications
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Serial to Parallel Converter Module
The serial to parallel converter takes serial data from either a SSI or RS-422 source and converts it to a 15 bit parallel output. This replaces the high cost and noise susceptibility of long, parallel cable runs with the simplicity of a low cost twisted pair cable to interface to a parallel-input PLC or controller.

Serial input type is selectable along with clock speed (for SSI) or baud (for RS422). The bright LED indicators give visual status for deserialization, testing and troubleshooting.

This module accepts inputs from 5 to 28 VDC and has output options of Vout=Vin, Vout=5V regulated or Vout = Open Collector. The compact DIN rail package is 105 mm wide, 78 mm deep and only 45 mm high and mounts to standard DIN Rail, EN 50 022, 35 mm x 7.5 mm, included with the module

Typical Application
Replace expensive parallel cable
A company was looking to replace a 12 bit absolute encoder and its cable.
This replacement was something the company have been avoiding since it was such a long cable run. It also had 15 conductors, making it a thick and expensive cable and that doesn't even include the labor costs for replacement.

With the availability of the Serial-to-Parallel Converter, this company was able to switch the encoder from a parallel output to an SSI output. The cable would shrink down to 8 conductors saving both material and installation costs and the signal would become more noise immune since it would be sent as differential pairs.

Instead of having to purchase a new SSI controller, the company purchased BEI's serial- to-parallel converter and keep the same controller. When all was said and done, the company ended up with a brand new axis control system for less cost than just replacing the old, parallel output cable.
Outline Drawing and Pin Out
Serial to parallel converter
Output Side
 
PIN   DESCRIPTION   NOTES

D14 to D0
 
Parallel Data Outputs
  For the SSI selection under pin FMT,
data is MSB justified.
For the RS422 selection under pin FMT,
data is LSB justified

 
--------
DVD
  --------
Data Valid

 
  Logic LO = Data Valid
Logic HI = Data not Valid (transitioning)

 
FMT   Format Select

 
  Logic HI (N/C) = SSI
Logic LO (0V) = RS422 (Asynchronous)

 
EN   Output Enable

 
  Logic HI (N/C) = Output Active
Logic LO (0V) = Inactive (High Impedance)

 
SPD   Speed Select

 
  For SSI:
Logic HI (N/C) = 1.25 MHz
Logic LO (0V) = 200kHz

For RS422:
Logic HI (N/C) = 19.2 kBaud
Logic LO (0V) = 115.2 kBaud

 
0V   Supply Common   Logic LO available for format and speed selections

Input Side

PIN   DESCRIPTION   NOTES

0V
 
Supply common
  Connect either 0V pin to power supply common. This should be the same supply common as used on the encoder.

 
0V   Supply common

 
  Connected internally - see note above

 
Vs   Supply voltage

 
  Provide 5 to 28 volts supply

 
D-   Data minus

 
  Connect to data - line from encoder

 
D+   Data plus   Connect to data + line from encoder

 
CL-   Clock minus   Connect to Clock- line from encoder (SSI only). If using RS422, then N/C

 
CL+   Clock plus   Connect to Clock+ line from encoder (SSI only). If using RS422, then N/C
DIR   N/C   Leave this disconnected