Example 5 - Mk1000 Waiting For Host Time-Out Period; Pck Rs-485 Communication Protocol - Symbol MK1000 Product Reference Manual

MK1000 MicroKiosk Product Reference Guide

Example 5 - MK1000 Waiting for Host Time-out Period

<STX> <DATA> <ETX> <LRC>
<EOT>

PCK RS-485 Communication Protocol

When communicating via RS-485, the host computer must poll each MK1000 individually.
Therefore, each MK1000 has a unique address programmable by bar code menus. The
value of the address ranges from hex 30 (48 decimal) to hex 4F (79 decimal).
The poll command format is:
<EOT> <ADDR> <ENQ>
The host and the MK1000 communicate with each other using the following packet format:
<SOH> <ADDR> <STX> <DATA> <ETX> <LRC>
If the MK1000 is polled and has no data, it responds with an EOT character.
The same ACK/NAK protocol used for RS-232 is used for RS-485 communication.
5-6
MK1000 Host
<ACK>