Polling Mode Options - Microscan QX Hawk User Manual

Communication

Polling Mode Options

These parameters only take effect for Polling Mode
RS-422 ports (not on the Auxiliary Port), and are completely independent of the ACK/NAK
Options <K147>.
The values of protocol characters can be changed, but the protocol events cannot be
disabled. The polling mode address is configured in the
To enable true multidrop protocol, the RS422/485 port must be enabled, <K102,1>, in
order to turn the transmitter on and off. If RS-232 is enabled instead of RS422/485,
<K102,0>, then Polling Mode will operate as a Point-to-Point polling protocol. This is
because the RS-232 transmitter is always left on when enabled.
Note: See ACK/NAK Data Flow Examples
communication scenarios.
RES-NAK Defaults
RES: (Reset)
REQ: (Request)
STX: (Start of Text)
ETX: (End of Text)
ACK: (Acknowledge)
NAK: (Negative Acknowledge)
5-26
<K140,5>
in Appendix F for sample Polling Mode
EOT (0x04)
ENQ (0x05)
STX (0x02)
ETX (0x03)
ACK (0x06)
NAK (0x15)
QX Hawk Industrial Imager User's Manual
on the main RS-232 or
<K140> command.