RDS and TMC display

hello

i have tmc receiver http://www.ebay.co.uk/itm/royaltek-gps-rds-tmc-traffic-receiver-develop-module-/170561018797
i try data text crashe in head :~ started on again.
will me started code how can sort out tmc data (2) example! , display in text!

here code use data:
#include <softwareserial.h>

softwareserial rds(3,4); // rx, tx
void setup()
{
  serial.begin(9600);
  rds.begin(9600);
}
void loop()
{
  if (rds.available())  serial.write(rds.read());
}

and here data:
$rttmc,0,e203,052f,77cd,2020*42
$rttmc,2,e203,2520,5033,2053*32
$rttmc,0,e203,052c,e67b,5352*47
$rttmc,2,e203,2521,7065,6c0d*37
$rttmc,2,e203,2520,5033,2053*32
$rttmc,8,e203,8521,4151,f252*40
$rtrds,99.8,9,3,2,1,1,1,100,0,0,0,0*6d
$rttmc,2,e203,2521,7065,6c0d*37
$rttmc,0,e203,0529,6174,2050*39
$rttmc,0,e203,052a,6468,3320*4c
$rttmc,2,e203,2520,5033,2053*32
$rttmc,8,e203,8521,4151,f252*40
$rttmc,0,e203,052f,77cd,2020*42
$rtrds,99.8,9,3,2,1,1,1,100,0,0,0,0*6d

hello again!

i have make string function frequency  out string: $rtrds,99.8,7,3,2,1,1,1,100,0,0,0,0*63

void loop()
{
  string s = checkrds();
  if(s && s.substring(0, 6) == "$rtrds")
  {   
    serial.print("frequency ");
    serial.print(s[7]);
    serial.print(s[8]);
    serial.print(s[9]);
    serial.print(s[10]);
    serial.println("mhz");
  }


and works frequency 99.8 if change 100.1 "100."
how can between comma?

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