NATIONAL DATA <NDAC> IN PACT WITH SIGNATURE National Data Communications Inc said it is no longer obligated to issue its majority shareholder <Signature Capital Corp> 20 mln common shares under a previous agreement. National said it entered into a new agreement with Signature, which would have owned about 80 pct of National's common under the prior pact. Under the new pact, National said it granted Signature a five-year option to acquire two mln shares of its common for an option price equal to its current market value. National has about 15.3 mln shares outstanding.