Appendix B, RS-232C Connection Technical
Information
RS-232C Pins
Pin 2: RS-232_TX
The RS-232 TX pin transmits data from the ValveMate 9000 controller to an external communication device.
Connect the RS-232 RX pin on the external communication device to this pin.
Pin 3: RS-232_RX
The RS-232 RX pin receives data from the external communication device into the ValveMate 9000 controller.
Connect the RS-232 TX pin on the external communication device to this pin.
Pin 5: Common Ground
RS-232C Protocol
Communication Specifications
The RS-232C protocol for the ValveMate 9000 controller uses the RS-232C standard. The controller acts as a
terminal to the remote host PC or PLC. The controller communicates using the following settings:
• Synchronous mode: half duplex
• Baud rates: 9600, 19200, 38400, 115200
• Start bit: 1
• Data length: 8 bit (ASCII)
• Parity bit: None
• Stop bit: 1
Communication Sequence
The host machine initiates all communication sequences. The controller echos all received characters.
The controller evaluates the last four characters in the command packet as the command.
Typical Command Packet:
xxxCCCC
(where xxx is the setting and CCCC is the command)
The length of the setting varies depending on the command.
Commands are evaluated after a carriage return ([Enter] or 0x0D hex). After a carriage return is received, the
controller evaluates the command, transmits any data related to the command, and closes the packet with <3.
Example:
The host machine sends 0disk followed by a carriage return (0x0D). The ValveMate 9000 controller replies
with Master Key OFF followed by <3 to terminate the command packet.
0disk [Enter]
Master Key OFF
<3
ValveMate 9000 Controller
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