Microscan Quadrus MINI, User Manual, Page: 52 / 424

3-8
Quadrus MINI 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