User`s guide

APPENDIX B
RS-232
Connection
Protocol
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APPENDIX B - RS-232 CONNECTION PROTOCOL
Pin 2: RS-232_TX
The RS-232 TX pin transmits data from the dispenser to an external communication device. The external
communication device should connect this pin to its RS-232 RX pin.
Pin 3: RS-232_RX
The RS-232 RX pin receives data from the external communication device into the dispenser. The external
communication device should connect this pin to its RS-232 TX pin.
Pin 5: Common Ground
1. RS-232 Protocol
1.1 Communication Specifications
The RS-232 protocol for the Ultimus V uses the RS-232C standard. The Ultimus V acts as a terminal
to the remote host PC or PLC. The Ultimus V communicates using the following settings.
• Synchronous Mode: Half Duplex
• Baud Rates: 9600, 19200, 38400, 115200
• Start Bit: 1
• Data Length: 8bit (ASCII)
• Parity Bit: None
• Stop Bit: 1
1.2 Data Codes
All command packets passed between the Ultimus V and the remote host will be formatted in ASCII.
The following ASCII codes are used as part of the communication protocol
• Packet Start: STX (0x02h)
• Packet End: ETX (0x03h)
• Acknowledge: ACK(0x06h)
• Not Acknowledge: NAK (0x15h)
• Enquiry: ENQ (0x05)
• End Of Transmission: EOT (0x04h)