User Guide
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PSC6194 Controller
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Configure Control Mode
To change Bronkhorst instrument from Analog to Modbus, or vice versa, the control mode must
be configured via FlowDDE(
https://www.bronkhorst.com/en-us/products-en/accessories-and-
software/flowware/flowdde/).
Connecting to FlowDDE
In the messages section the general procedure to start serving client applications with the
FlowDDE server is described in four steps:
1. Connect an instrument to a COM port of the PC
2. Set the communication settings
3. Start the communication
a. Press F3 or
b. Communication tab > Open Communication
4. Wait until FlowDDE is ready
a. Message: “Server is active and ready for any client”
If further instruction is needed, please refer to the FlowDDE Manual found in the link above.
Analog to Modbus Configuration
After opening communication, use the following steps to change the Control Mode from Analog
operation to Modbus operation:
1. FLOW-BUS tab > Test Flow-BUS and DDE
a. Or Press F6
2. Select the following parameters to view simultaneously
a. Parameter 7 –
InitReset
b. Parameter 12 –
IO Status
3. Set parameter
InitReset to 64 (unlocked)
4. Read parameter
IO Status
5. Subtract 64 from the read value
a. New Parameter Value: 15 or 11
6. Write the new value to parameter
IO Status
7. Set parameter
InitReset to 82 (locked)
8. Restart Bronkhorst instrument
a. InitReset must be unlocked/locked for the new Control Mode to remain after the
instrument
is restarted