QX-830 Compact Industrial Scanner User’s Manual 5-29
Scanner Parameters
Polling Mode Options
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.
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 Polling Mode Data Flow Examples in Appendix E for sample Polling Mode
communication scenarios.
RES-NAK Defaults
RES: (Reset) EOT (0x04)
REQ: (Request) ENQ (0x05)
STX: (Start of Text) STX (0x02)
ETX: (End of Text) ETX (0x03)
ACK: (Acknowledge) ACK (0x06)
NAK: (Negative Acknowledge) NAK (0x15)
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