APPENDIX D
4618-021
138
•
‘z16’ command
(timing for fast emulation mode)
This command has two parameters (min. and max) and is only used for fast emulation mode.
min = min gap time between messages (ms), default 20ms.
This time is used by the metal detector, if a
change to the screen message was detected.
max = max gap time between messages (ms), default 1000ms.
This time is used if there was no change to the screen message.
The timings should only be changed whilst fast emulation mode is not active. All times are approximate, typically the
actual delay will be value + 8 ms.
Note: In most instances there should be no need to alter the default values.
•
‘z20’ command
•
The ‘z20’ cmd transmits the information to update the screen. This command behaves slightly different
depending on the emulation mode used (fast or normal).
•
In both modes (fast and normal emulation) the screen info data transmitted is packed as described under
‘Screen package format’.
•
The ‘z20’ command in normal emulation mode
•
The command behaves like any other command under the PCI protocol.
•
The screen update has to be requested by the host.
•
The message format would look as follows:
(STX)
G
(VALUE)
M
(VALUE)
z20
,(ENCODED DATAPACK)(ETX)(CRC)
•
The ‘z20’ command in fast emulation mode
•
The ‘z20’ cmd is automatically transmitted on a timed interval.(For timing see ‘z16’ cmd)
•
The host processor must not respond with ACK/NAK’s for the ‘z20’ cmd.
•
The ‘z20’ message is ‘injected’ into the normal protocol data regardless if the serial link is
•
busy
or
not.
•
The start and end chars are different:
(First char: ‘SOH’ 0x01 / End char: ‘EOT’ 0x04)
This has been done to give the host the ability to filter out the screen update information from the normal
protocol. The host has to scrutinize every character received for a potential ‘SOH’ character and, if
detected, remove the screen up-date info from the normal protocol stream.
•
The message format would look as follows:
(SOH)z20,(ENCODED DATAPACK)(EOT)(CRC)
Содержание Signature
Страница 16: ......
Страница 26: ...INSTALLATION 10 4618 021 Fig 5 Typical Metal Detector Conveyor ...
Страница 31: ...INSTALLATION 4618 021 15 Fig 10 Cable Gland Assemblies for Power Supply Unit ...
Страница 52: ...OPERATING INSTRUCTIONS 36 4618 021 Fig 14 Supervisor Mode Flow Chart ...
Страница 55: ...OPERATING INSTRUCTIONS 4618 021 39 Fig 15 Engineer Mode Flow Chart ...
Страница 71: ...OPERATING INSTRUCTIONS 4618 021 55 Fig 16 Pack Sensor Mode Flow Chart ...
Страница 82: ...OPERATING INSTRUCTIONS 66 4618 021 Fig 18 QA Inspector And Operator Flow Chart ...
Страница 92: ...OPERATING INSTRUCTIONS 76 4618 021 Fig 19 Viewing Mode Flow Chart ...