MOD-EKG output Via MOD-USB-RS-232 to external display / PC

[Wayneroha]

Hi Lub/Olimex,

1.   MOD-EKG:
It had been powered-up using an external power-supply (a DC-Power-Supply) which provided 3.3V into the MOD-EKG;

a.   Result was; MOD-EKG powered-on but the four arrows either still or off on the LCD-screen. Some digital values were displayed on the LCD-Screen, the figure shown not changed when the HR1, HR2, HR3 and HR4 (PADs) had had been touched. Sometimes it displays alien characters or character styles on the LCD-screen.

b.   Sometimes, LCD-screen is not showing the four-arrows, when pad were been touched, or the four- arrows are displayed but never goes off. 

c.   Sometimes; when pads were been touched; the four arrows displayed and untouched the four arrows goes off. While keeping in touch with the pads; the four arrows displayed and it never goes off unit untouched.

2.   MOD-USB-RS232
It was powered on when connected to the laptop using the USB cable.

3.   While MOD-EKG connecting to MOD-USB-RS232
Only two wires were used to connect two deviced; from the MOD-EKG to MOD-USB-RS232. These two wires used to connect two unit's pins as follows;
-   MOD-EKG's pin-3 (TXD) connected to pin-3 (RXD) of MOD-USB-RS232.
-   MOD-EKG's pin-4 (RXD) connected to pin-4 (TXD) of MOD0USB-RS232.
-   Result was as follows; it displayed a wave which is running but the wave was not normal.

Please guide me
Harindra