Data Flow Systems TCU800, Installation And Operation Manual

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A d d i n g a R I O t o t h e T C U
Place the RIO in Learn Mode
When all of the RIO’s communication configuration switches are left in the Off position (see step 2, Configure RIO for
Learn Mode, above) and the RIO’s configuration button is held down during power up, the RIO enters learn mode. The
RIO then attempts to determine baud and protocol settings within three to ten polling loops (depending on settings such
as baud rate).
1. Hold down the configuration button while powering up the device. All of the RIO032’s LED’s come on.
2. Release the configuration button when the RXD, TXD, and Status LED’s go off.
3. The TXD will flash rapidly and then the TXD, RXD, and Status LED’s will blink.
4. After a minimum of three polls are received (may take up to ten polls), the RXD will blink three times. The TXD, RXD
and Status LED’s will turn on and then off indicating that Learn (auto configuration) is complete.
During the Learn process, the RIO032 uses the CTS (clear to send) signal to determine if it is connected to a radio. Radios,
unlike other devices, don’t activate the CTS signal until an RTS (request to send) is asserted. If the RIO032 determines that
is it connected to a radio, it will communicate using the RTU Radio protocol. This protocol is identical to RTU protocol
except that the RIO expects a CTS to occur whenever it asserts an RTS, and it will wait for the CTS signal before it
transmits any data. This protocol allows the RIO032 to be connected to an RDR (Rail Data Radio) or other manufacturer
radio without using special cabling.
Configuring the TCU to Poll the RIO
In order for the TCU to poll the RIO and make the RIO’s data available to HT3, the RIO’s I/O information must be added
to the TCU’s configuration.
Modules H-O in the TCU are reserved for Modbus slave devices. Each module can accommodate up to:
• Twelve (12) digital status registers, or
• Eight (8) digital control registers, or
• Four (4) analog status registers, or
• Four (4) analog control registers
The instructions below are for a TCU using the built in pump control application.
1. Page through the TCU’s configuration screens until you reach the screen that includes the “Configure Modbus” option.
Navigate to the Configure Modbus line and press Enter.
2. The first screen allows you to configure the Module H and Module I registers. Use the right navigation button to page to
the screens for the remaining modules (J-O). When configuring for Modbus polling, we recommend that you use the first
available TCU module. For example, if modules J-O are available, configure module J; don’t skip to M.
3. For each module you want to configure, you must enter an address (ModX Adr) and length (ModX Lth):