6100 MPS-B Programming Manual

INTRODUCTION TO 6100 MPS-B
Message Formats
Response Message Format
The response Text field begins with a message control word (MCW)
followed by the message. The basic WRITEREAD buffer response
Text field appears as follows:
Message Control Word
|<--- (two bytes) --->|
_______________________
|||
| MCW | ...
| ||_
|<------------------ message ------------------->|
_______________________/ /________________________
| SOH | / / | |
... | or |<--------- text --------->| ETX |
| STX | / / ||
/ /
The elements of the WRITEREAD buffer response Text field are
defined below:
Text field = MCW message
MCW = Message Control Word (2 bytes)
Byte 0 = 0
Byte 1 = station-index from Poll/Select List
message = SOH text ETX or,
STX text ETX
SOH = Start of text for Burroughs protocol response
or ADM-2 protocol Function Key input response
(1 byte, optional)
STX = Start of text for ADM-2 protocol or NCR
protocol response (1 byte, optional)
text = Response text string (2K bytes maximum)
ETX = End of text (1 byte)
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