
#define XM_SOH  0x01   /* start of transmission */
#define XM_EOT  0x04   /* end of transmission */
#define XM_ACK  0x06   /* acknowledgement - positive */
#define XM_DLE  0x10   /* data link escape */
#define XM_XON  0x11   /* transmit on */
#define XM_XOFF 0x13   /* transmit off */
#define XM_NAK  0x15   /* negative acknowledgement */
#define XM_SYN  0x16   /* synchronous idle */
#define XM_CAN  0x18   /* cancel */

/* CRC X Modem */
#define XM_CRC  'C'    /* desire to establish CRC type X modem */
#define XM_BUFSIZE 128  /* work with 128 bytes at a time */
