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EZ Match User’s Manual
4-9
Communications
Polling Mode Options
RES-NAK Defaults
Note:
See
Polling Mode Data Flow Examples
in Appendix D for sample
Polling Mode
communication scenarios.
Note:
See
USB HID Interface
on page 4-24 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 4-7).
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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