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MULTIPORT ELECTRONIC CONTROLLER continued...
8
Register
40003
Read disable positions.
- Bits 1 to 8 indidacte which positions are disabled.
Register
40004
Read current encoder position.
- 0 to 1023
Register
40005
Write to set home position number.
Read current home position number.
- 1 to 8
RS-232 connections to MP-08 DA-09 connector:
Pin #2 = RX-232 TX to host
Pin #3 = RS-232 RX from host
Pin #5 = Signal ground
Pin #7 = RTS to host
Pin #8 = CTS from host
RS-485 connections to MP-08 DA-09 connector:
Pin #6 = RS-485 -
Pin #9 = RS-485 +
General RS-485 cable specifications are:
- 1 pair twisted shielded
- 120 ohm impedance
- 30 Volt rating
- 24 gauge
- stranded conductors
Example: Belden #9841 with RS-485, maximum distance is 4000 ft. When using
other cable, the terminating resistance may vary from 120 OHM. Contact
the factory for assistance.
Optional software is available for personal computers in DOS, Windows 3.11, and
Windows 95 versions.
E. ELECTRONIC CONTROLLER FEATURES
When a command is sent from the host device to move the valve to a position, the MEC
turns on the motor and monitors the position until the valve is within a few degrees of actual
position. At that time the motor will be turned off to prevent its momentum from
overshooting the required position. If the valve is still not quite on position, the
microcontroller will pulse the motor to slowly move to the exact position. The
microcontroller will also compensate for changes in torque requirements to accurately
position the valve, regardless of the media or valve conditions.
Small pushbuttons on the circuit board allow local control for calibration/maintenance
purposes.
Jumpers on the circuit board will disable any ports on the Multiport Valve which are not
being utilized.
LED's on the circuit board indicate operating status.