
RS232 Relay Switch at a Glance...
- 32 Relays Installed on a Circuit Board
- RS232 Interface with Choice of Connector
- Onboard DB9 Connector
- Screw Terminal Connector
- Off the Board DB9 Connector
- Connect to Any Existing COM Port - ProXR Versions
- Industry Leading Command Set
- Expandable to 256 Relays - Industry Leading Command Set
- Send Specific Commands to Trigger Relays
- Trigger Any or All Relays
- Program in Almost any Language
- Read 0 to 5 Volt Sensors
Selecting the Proper Amperage
For more information on selecting a board with the correct relay amperage for your application see Choosing a Proper Amperage.
Selecting The RS-232 Interface
By selecting the RS-232 interface you will be sending commands to the board through either a DB9 or direct wire interface. Boards on this page are equipped with a ZRS communications module that adds RS-232 communications to the board. At checkout you will have three modules to choose from with either a DB9 or direct (3-wire) connection. A command consists of a few bytes of data in numerical format usually between 2 and 6 bytes. Once the command has been received, the controller processes the command and the relay activates.Selecting a Board
