https://www.widgetsinc.com/product/vlct-4pspc/
4 PORT NETWORK SERIAL EXPANDER VLCT-4PSPC | Widgets, Inc.
4 PORT NETWORK SERIAL EXPANDER. New. $541.00. Ships from Southern California.
portnetworkserialexpandervlct
https://www.voc-electronics.com/a-29621505/chips-and-bits/mcp23008-i2c-8-input-output-port-expander/
MCP23008 - i2c 8 input/output port expander | Chips and bits | V.O.C.-Electronics
Add another 8 pins to your microcontroller using a MCP23008 port expander. The MCP23008 uses two i2c pins (these can be shared with other i2c devices), and in...
input outputport expanderchipsbitselectronics