RS232-TD comm on 390

Hello,
Trying to get a 390 (running 1.12) to talk to a servo controller 
(http://www.seetron.com/ssc.htm).
I've been using both STEP+ and older Vinculum protoadapter boards.
The controller only uses DB9 pin 3 (TD) and 5 (GND) to talk RS232, and 
claims to
work with any hardware that handles RS232.
I've run the corresponding J2SE code from my laptop with the controller 
connected
without any problems.
On the tini, I've run "stopserver -s" through telnet and then started my 
program with the
controller connected, which appears to run fine, but nothing seems to be 
happening on
serial0. I've tried connecting the TINI to my laptop to run a 
hyperterminal session, but
that seems to lock up the TINI somehow. Can anyone offer any help?
/ Pär

The (both the tini and J2SE) program simply does the standard:

        sp = (SerialPort) 
CommPortIdentifier.getPortIdentifier("serial0").open(serialName, 5000);
        sp.setSerialPortParams(9600, SerialPort.DATABITS_8,
                       SerialPort.STOPBITS_1,
                       SerialPort.PARITY_NONE);
        sp.setFlowControlMode(SerialPort.FLOWCONTROL_NONE);
        serialOut = sp.getOutputStream();

and then to work the servos I send three bytes per session:
        // send the attention signal
        serialOut.write((byte)255);
        serialOut.flush();
        // select the servo to control
        serialOut.write((byte)servo);
        serialOut.flush();
        // write the position
        serialOut.write((byte)position);
        serialOut.flush();

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