Chapter 3. Application Configuration3-24 Express 3010/3110 User Manual 61200239L1-20SYNC V.25 HDLC DialingAlthough V.25 bis allows asynchronous data format, asynchronousDTE is more likely to support the AT command set than V.25 bis.This setting provides V.25 bis messages in bit-synchronous format (forexample, HDLC, SDLC, X.25). The bit-synchronous format is the mostcommonly used by V.25 bis.This option specifies that the characters should be 7-bit ASCII, withthe 8th bit ignored (it may be either 0 or 1).The first byte of each packet contains all one bits (A = FF HEX), andthe second byte of each packet (the C byte) is either 13 HEX or 03 HEXif not the final packet.Select V.25 HDLC flags if your terminal equipment requires idlestate flags.SYNC V.25 BISYNC DialingThis setting allows for V.25 bis messages in byte-synchronous format(BISYNC). V.25 bis specifies that the characters should be ASCII, 7bits, and odd parity. This setting allows synchronous DTE which doesnot use HDLC to support serial in-band dialing.
