3-8 MINI Hawk High Performance Imager User’s Manual
Polling Mode Options
Polling Mode Options
RES-NAK Defaults
Note: See Polling Mode Data Flow Examples in Appendix E for sample Polling Mode
communication scenarios.
Note: See USB HID Interface on page 3-23 for protocol information relating to USB.
Definition: These parameters only take effect for Polling Mode <K140,5> on the main
RS-232 or 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 <K140>
command (see Poll Address on page 3-6).
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.
Serial Cmd: <K148,RES,REQ,STX,ETX,ACK,NAK>
RES: (Reset) 04
REQ: (Request) 05
STX: (Start of Text) 02
ETX: (End of Text) 03
ACK: (Acknowledge) 06
NAK: (Negative Acknowledge) 15
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