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ZBasic Language Reference
145
ZX Microcontroller Family
Finally, the zload command must be invoked in emergency update mode, an example of which is shown
below.
zload –c2 –e zvm_1-12-0.zvm
When the emergency update completes successfully the ZX may be powered off and the grounding
jumpers may be removed. When it is powered up again it will begin running the newly installed control
program normally. Note that the emergency mode may be used any time but because of the extra
connections that are required it is primarily intended for extraordinary circumstances when the normal
update mode cannot be employed.
24-pin ZX Device Connections for Emergency Update Mode
The emergency update procedure for other ZX devices is similar to that described above. To prepare for
the emergency firmware update, consult the table below for the specific device and ground the indicated
pin or pins.
Device
Pins to Ground
ZX-40, ZX-40a, ZX-40p, ZX-40s
5, 7 (B.4, B.6)
ZX-44, ZX-44a, ZX-44p, ZX-44s
2, 44 (B.4, B.6)
ZX-1281
25 (D.0)
ZX-1280
43 (D.0)
When the ZX powers up and detects that these pins are grounded, it will enter the emergency update
mode and await an emergency firmware download on the serial port. After the firmware update is
downloaded using the zload command with the –e option the device should be powered off and the
grounding jumpers should be removed. When it is powered up again it will begin running the newly
installed control program normally.
9.2 Device Configuration
The device configuration option, -z, can be used to set configuration parameters of the device (held in the
reserved system Persistent Memory). The supported elements are given in the table below.
Configuration Element
Syntax
EEPROM type and size
-z0:<EEPROM type>
External RAM configuration
-z1:<ext RAM cfg>
ATN character
-z3:<ATN char>
Default Com1 speed (VM devices only)
-z4:<Com1 speed index>
Sign-on flag
-z5:<sign-on flag>
Byte value
-zb:<addr>:<value>
Word value
-zw:<addr>:<value>
Double word value
-zd:<addr>:<value>
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