Async Control Character Map - The ACCM value serves as a mask for the first 32 characters in the ASCII table. Control characters may cause problems when they are transferred on the network. This can be handled by escaping them ( adding escape character to them ). For example , when using modems in the network which can not receive X-on and X-off characters. The ACCM is a mask which shows which control characters will be handled with an escape sequence. Each bit represents one character. Possible values: Octet string of 4 bytes: 00000000 . A bit with value 1 will cause the character to be in an escape sequence. 0 will leave the character as it is. Example : to use XON and XOFF as escape sequence : 000A0000 Default value: 00000000. For Sync Links return the default.