Host communication commands, Pck ethernet & rs-232 communication protocol, Host communication commands -3 – Symbol Technologies MK1000 User Manual
Page 105: Pck ethernet & rs-232 communication protocol -3
5-3
PCK Emulation
Host Communication Commands
lists the commands used in host communications.
PCK Ethernet & RS-232 Communication Protocol
When communicating to the host terminal via Ethernet or RS-232, MK1000 data is
formatted as follows:
<STX> <DATA> <ETX> <LRC>
Table 5-2. Host Communication Commands
Control Character
Hex Representation
Description
<STX>
02
ASCII Start of Text
<ETX>
03
ASCII End of Text
<SOH>
01
ASCII Start of Header
<EOT>
04
ASCII End of Transmission
<DATA>
00-FF
Data packet. This is the actual data being
sent to the MK1000. The maximum size of
the packet is 300 bytes, but under 50 is
recommended for accurate communication.
<LRC>
00-FF
Used for error detection, LRC is the
Exclusive-OR (XOR) of all characters in
<DATA> and the <ETX>.
<ADDR>
30-4F
The address of the MK1000 when used in a
485 network. Each unit is assigned a unique
address.
<ENQ>
05
ASCII Enquiry
<ACK>
06
ASCII Acknowledge
<NAK>
15
ASCII Negative Acknowledge