m2bus problem

[Simon]

I am using gnokii under win32 with 5110 connected via RTM60301 NKI6210 cable.  Opening the cable connector reveals four pins used so presume that is Fbus/mbus capable.

 

No problems communicating with the 5110 using fbus.  m2bus times out and quits after, is it 10 retrys?, according to code.

 

Looking at the m2bus.c code it has the following

 

************************************************************

static bool m2bus_serial_open(struct gn_statemachine *state)
{
 /* Open device. */
 if (!device_open(state->config.port_device, true, false, false, GN_CT_Serial, state)) {
  perror(_("Couldn't open M2BUS device"));
  return false;
 }
 device_changespeed(9600, state);

 

 /*
  * Need to "toggle" the dtr/rts lines in the right sequence it seems
  * for the interface to work. Base time value is units of 50ms it
  * seems.
  */
 device_setdtrrts(0, 1, state);

 

 return true;
}

************************************************************

 

The toggling goes no further... but in other phones (6150) the toggling was described thus.. 

 

 

************************************************************

  /* Need to "toggle" the dtr/rts lines in the right
           sequence it seems for the interface to work.
     Base time value is units of 50ms it seems */

 

#define BASE_TIME  (50000)

 

  /* Default state */
    device_setdtrrts(0, 1);
 sleep(1);

 

  /* RTS low for 250ms */
    device_setdtrrts(0, 0);
 usleep(5 * BASE_TIME);

 

  /* RTS high, DTR high for 50ms */
    device_setdtrrts(1, 1);
 usleep(BASE_TIME);

 

  /* RTS low, DTR high for 50ms */
    device_setdtrrts(1, 0);
 usleep(BASE_TIME);

 

  /* RTS high, DTR high for 50ms */
    device_setdtrrts(1, 1);
 usleep(BASE_TIME);

 

  /* RTS low, DTR high for 50ms */
    device_setdtrrts(1, 0);
 usleep(BASE_TIME);

 

  /* RTS low, DTR low for 50ms */
    device_setdtrrts(0, 0);
 usleep(BASE_TIME);

 

  /* RTS low, DTR high for 50ms */
    device_setdtrrts(1, 0);
 usleep(BASE_TIME);

 

  /* RTS high, DTR high for 50ms */
    device_setdtrrts(1, 1);
 usleep(BASE_TIME);

 

  /* RTS low, DTR low for 50ms */
    device_setdtrrts(0, 0);
 usleep(BASE_TIME);

 

  /* leave RTS high, DTR low for duration of session. */
 usleep(BASE_TIME);
    device_setdtrrts(0, 1);

 

 sleep(1);

************************************************************

In wait4idle it lowers rts then raises rts leaving dtr low.

 

I read somewhere that the dtr must be held high during the communications or else the bus will revert to Fbus mode.  And that the rts was used to control the bus, ie you listen i talk, i listen you talk...

 

Is it enough to simply raise rts and lower dtr as the m2bus code does?  I guess what I need to know is if it works for just one 5110.

 

 

Cheers

Simon