6100 MPS-B Programming Manual

INTRODUCTION TO 6100 MPS-B

Message Formats

A message may begin with SOH if it has a heading. Otherwise, it

must begin with STX. A message is terminated with ETX followed

by a Block Check Character (BCC). The BCC is provided by 6100

MPS-B.

NOTE

For Burroughs Multipoint protocol, messages always begin with

SOH followed by a prefix which identifies a single tributary

station. For ADM-2 Multipoint protocol, a message begins with

SOH only when it represents a Function Key message.

The simplest form of a message is shown in Figure 1-2.

-----------------------------------------------------------------

| |

| _________________________________________________________ |

| | | | address | SOH | | | | |

| | SYN | SYN | of | or |<---- text --->| ETX | BCC | |

| | | | station | STX | | | | |

| |

-----------------------------------------------------------------

Figure 1-2. Basic Message Form

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