ZBasic Forum

I'm using serial channel 2 on a zx24n with a mask of bx00001000 connected to a max232.

So non-inverted right ? Should I have pull up or pull down resistors on pins 6 & 11 ? I've got 10k pull-ups but i'm not getting any output and want to eliminate this as a possible cause.

thanks

FFMan wrote:Should I have pull up or pull down resistors on pins 6 & 11 ?

The way to remember whether to use a pullup or pulldown is to consider that you need to pull the line to the "idle" state. A non-inverted, TTL-level serial input or output idles at +V so you need a pull-up to achieve the idle state. Conversely, an inverted, TTL-level serial input or output idles at 0V so you would need a pull-down to achieve the idle state.