Provided by: linuxcnc-uspace_2.9.0~pre1+git20230208.f1270d6ed7-1_amd64 
NAME
hostmot2 - Smart Serial LinuxCNC HAL driver for the Mesa Electronics HostMot2 Smart-Serial
remote cards
SYNOPSIS
The Mesa Smart-Serial interface is a 2.5Mbs proprietary interface between the Mesa
Anything-IO cards and a range of subsidiary devices termed "smart-serial remotes". The
remote cards perform a variety of functions, but typically they combine various classes of
IO. The remote cards are self-configuring, in that they tell the main LinuxCNC Hostmot2
driver what their pin functions are and what they should be named.
Many sserial remotes offer different pinouts depending on the mode they are started up in.
This is set using the sserial_port_N= option in the hm2_pci modparam. See the hostmot2
manpage for further details.
It is likely that this documentation will be permanently out of date.
Each Anything-IO board can attach up to 8 sserial remotes to each header (either the 5-pin
headers on the 5I20/5I22/5I23/7I43 or the 25-pin connectors on the 5I25, 6I25 and 7I80).
The remotes are grouped into "ports" of up to 8 "channels". Typically each header will be
a single 8 channel port, but this is not necessarily always the case.
PORTS
In addition to the per-channel/device pins detailed below there are three per-port pins
and three parameters.
Pins:
(bit, in) .sserial.port-N.run: Enables the specific Smart Serial module. Setting this pin
low will disable all boards on the port and puts the port in a pass-through mode where
device parameter setting is possible. It is necessary to toggle the state of this pin if
there is a requirement to alter a remote parameter on a live system. This pin defaults to
TRUE and can be left unconnected. However, toggling the pin low-to-high will re-enable a
faulted drive so the pin could usefully be connected to the iocontrol.0.user-enable-out
pin.
(u32, ro) .run_state: Shows the state of the sserial communications state-machine. This
pin will generally show a value of 0x03 in normal operation, 0x07 in setup mode and 0x00
when the "run" pin is false.
(u32, ro) .error-count: Indicates the state of the Smart Serial error handler, see the
parameters section for more details.
Parameters:
(u32 r/w) .fault-inc: Any over-run or handshaking error in the SmartSerial communications
will increment the .fault-count pin by the amount specified by this parameter. Default =
10.
(u32 r/w) .fault-dec: Every successful read/write cycle decrements the fault counter by
this amount. Default = 1.
(u32 r/w) .fault-lim: When the fault counter reaches this threshold the Smart Serial
interface on the corresponding port will be stopped and an error printed in dmesg.
Together these three pins allow for control over the degree of fault- tolerance allowed in
the interface. The default values mean that if more than one transaction in ten fails,
more than 20 times, then a hard error will be raised. If the increment were to be set to
zero then no error would ever be raised, and the system would carry on regardless.
Conversely setting decrement to zero, threshold to 1 and limit to 1 means that absolutely
no errors will be tolerated. (This structure is copied directly from vehicle ECU
practice.)
Any other parameters than the ones above are created by the card istelf from data in the
remote firmware. They may be set in the HAL file using "setp" in the usual way.
NOTE: Because a Smart-Serial remote can only communicate non-process data to the host card
in setup mode, it is necessary to stop and re-start the smart-serial port associated with
the card to alter the value of a parameter.
ALSO NOTE: in the case of parameters beginning with "nv" (which are stored in non-volatile
memory) the effect will not be seen until after the next power cycle of the drive.
Unchanged values will not be re-written so it is safe to leave the "setp" commands in the
HAL file or delete them as you see fit.
DEVICES
The other pins and parameters created in HAL depend on the devices detected. The
following list of Smart Serial devices is by no means exhaustive.
8I20
The 8I20 is a 2.2 kW three-phase drive for brushless DC motors and AC servo motors. 8I20
pins and parameters have names like
"hm2_<BoardType>.<BoardNum>.8i20.<PortNum>.<ChanNum>.<Pin>", for example
"hm2_5i23.0.8i20.1.3.current" would set the phase current for the drive connected to the
fourth channel of the second sserial port of the first 5I23 board. Note that the sserial
ports do not necessarily correlate in layout or number to the physical ports on the card.
Pins:
(float in) angle
The rotor angle of the motor in fractions of a full phase revolution. An angle of
0.5 indicates that the motor is half a turn / 180 degrees / π radians from the zero
position. The zero position is taken to be the position that the motor adopts
under no load with a poitive voltage applied to the A (or U) phase and both B and C
(or V and W) connected to -V or 0 V. A 6 pole motor will have 3 zero positions per
physical rotation. Note that the 8I20 drive automatically adds the phase lead/lag
angle, and that this pin should see the raw rotor angle. There is a HAL module
(bldc) which handles the complexity of differing motor and drive types.
(float, in) current
The phase current command to the drive. This is scaled from -1 to +1 for forwards
and reverse maximum currents. The absolute value of the current is set by the
max_current parameter.
(float, ro) bus-voltage
The drive bus voltage in V. This will tend to show 25.6 V when the drive is
unpowered and the drive will not operate below about 50 V.
(float, ro) temp
The temperature of the driver in degrees C.
(u32, ro) comms
The communication status of the drive. See the manual for more details.
(bit, ro) status and fault.
The following fault/status bits are exported. For further details see the 8I20
manual. fault.U-current / fault.U-current-not fault.V-current /
fault.V-current-not fault.W-current / fault.W-current-not fault.bus-high /
fault.bus-high-not fault.bus-overv / fault.bus-overv-not fault.bus-underv /
fault.bus-underv-not fault.framingr / fault.framingr-not fault.module /
fault.module-not fault.no-enable / fault.no-enable-not fault.overcurrent /
fault.overcurrent-not fault.overrun / fault.overrun-not fault.overtemp /
fault.overtemp-not fault.watchdog / fault.watchdog-not
status.brake-old / status.brake-old-not status.brake-on / status.brake-on-not
status.bus-underv / status.bus-underv-not status.current-lim /
status.current-lim-no status.ext-reset / status.ext-reset-not status.no-enable /
status.no-enable-not status.pid-on / status.pid-on-not status.sw-reset /
status.sw-reset-not status.wd-reset / status.wd-reset-not
Parameters:
The following parameters are exported. See the PDF documentation downloadable from
Mesa for further details.
hm2_5i25.0.8i20.0.1.angle-maxlim
hm2_5i25.0.8i20.0.1.angle-minlim
hm2_5i25.0.8i20.0.1.angle-scalemax
hm2_5i25.0.8i20.0.1.current-maxlim
hm2_5i25.0.8i20.0.1.current-minlim
hm2_5i25.0.8i20.0.1.current-scalemax
hm2_5i25.0.8i20.0.1.nvbrakeoffv
hm2_5i25.0.8i20.0.1.nvbrakeonv
hm2_5i25.0.8i20.0.1.nvbusoverv
hm2_5i25.0.8i20.0.1.nvbusundervmax
hm2_5i25.0.8i20.0.1.nvbusundervmin
hm2_5i25.0.8i20.0.1.nvkdihi
hm2_5i25.0.8i20.0.1.nvkdil
hm2_5i25.0.8i20.0.1.nvkdilo
hm2_5i25.0.8i20.0.1.nvkdp
hm2_5i25.0.8i20.0.1.nvkqihi
hm2_5i25.0.8i20.0.1.nvkqil
hm2_5i25.0.8i20.0.1.nvkqilo
hm2_5i25.0.8i20.0.1.nvkqp
hm2_5i25.0.8i20.0.1.nvmaxcurrent
hm2_5i25.0.8i20.0.1.nvrembaudrate
hm2_5i25.0.8i20.0.1.swrevision
hm2_5i25.0.8i20.0.1.unitnumber
(float, rw) max_current
Sets the maximum drive current in Amps. The default value is the maximum current
programmed into the drive EEPROM. The value must be positive, and an error will be
raised if a current in excess of the drive maximum is requested.
(u32, ro) serial_number
The serial number of the connected drive. This is also shown on the label on the
drive.
7I64
The 7I64 is a 24-input 24-output IO card. 7I64 pins and parameters have names like
"hm2_<BoardType>.<BoardNum>.7i64.<PortNum>.<ChanNum>.<Pin>", for example
hm2_5i23.0.7i64.1.3.output-01 .
Pins:
(bit, in) 7i64.0.0.output-NN: Writing a 1 or TRUE to this pin will enable output driver
NN. Note that the outputs are drivers (switches) rather than voltage outputs. The LED
adjacent to the connector on the board shows the status. The output can be inverted by
setting a parameter.
(bit, out) 7i64.0.0.input-NN: The value of input NN. Note that the inputs are isolated
and both pins of each input must be connected, typically to signal and the ground of the
signal. (This need not be the ground of the board.)
(bit, out) 7i64.0.0.input-NN-not: An inverted copy of the corresponding input.
(float, out) 7i64.0.0.analog0 & 7i64.0.0.analog1: The two analogue inputs (0 to 3.3 V) on
the board.
Parameters:
(bit, rw) 7i64.0.0.output-NN-invert: Setting this parameter to 1 / TRUE will invert the
output value, such that writing 0 to .gpio.NN.out will enable the output and vice-versa.
7I76
The 7I76 is not really a smart-serial device. It serves as a breakout for a number of
other Hostmot2 functions. There are connections for 5 step generators (for which see the
main hostmot2 manpage). The stepgen pins are associated with the 5I25
(hm2_5i25.0.stepgen.00....) whereas the smart-serial pins are associated with the 7I76
(hm2_5i25.0.7i76.0.0.output-00).
Pins:
(float out) .7i76.0.0.analogN (modes 1 and 2 only) Analogue input values.
(float out) .7i76.0.0.fieldvoltage (mode 2 only) Field voltage monitoring pin.
(bit in) .7i76.0.0.spindir: This pin provides a means to drive the spindle VFD direction
terminals on the 7I76 board.
(bit in) .7i76.0.0.spinena: This pin drives the spindle-enable terminals on the 7I76
board.
(float in) .7i76.0.0.spinout: This controls the analogue output of the 7I76. This is
intended as a speed control signal for a VFD.
(bit out) .7i76.0.0.output-NN: (NN = 0 to 15). 16 digital outputs. The sense of the signal
can be set via a parameter.
(bit out) .7i76.0.0.input-NN: (NN = 0 to 31) 32 digital inputs.
(bit in) .7i76.0.0.input-NN-not: (NN = 0 to 31) An inverted copy of the inputs provided
for convenience. The two complementary pins may be connected to different signal nets.
Parameters:
(u32 ro) .7i76.0.0.nvbaudrate: Indicates the vbaud rate. This probably should not be
altered.
(u32 ro) .7i76.0.0.nvunitnumber: Indicates the serial number of the device and should
match a sticker on the card. This can be useful for working out which card is which.
(u32 ro) .7i76.0.0.nvwatchdogtimeout: The sserial remote watchdog timeout. This is
separate from the Anything-IO card timeout. This is unlikely to need to be changed.
(bit rw) .7i76.0.0.output-NN-invert: Invert the sense of the corresponding output pin.
(bit rw) .7i76.0.0.spindir-invert: Invert the senseof the spindle direction pin.
(bit rw) .7i76.0.0.spinena-invert: Invert the sense of the spindle-enable pin.
(float rw) .7i76.0.0.spinout-maxlim: The maximum speed request allowable
(float rw) .7i76.0.0.spinout-minlim: The minimum speed request.
(float rw) .7i76.0.0.spinout-scalemax: The spindle speed scaling. This is the speed
request which would correspond to full-scale output from the spindle control pin. For
example with a 10 V drive voltage and a 10000 RPM scalemax a value of 10,000 RPM on the
spinout pin would produce 10 V output. However, if spinout-maxlim were set to 5,000 RPM
then no voltage above 5 V would be output.
(u32 ro) .7i76.0.0.swrevision: The onboard firmware revision number. Utilities (man
setsserial for details) exist to update and change this firmware.
7I77
The 7I77 is an 6-axis servo control card. The analogue outputs are smart-serial devices,
but the encoders are conventional hostmot2 encoders and further details of them may be
found in the hostmot2 manpage.
Pins:
(bit out) .7i77.0.0.input-NN: (NN = 0 to 31) 32 digital inputs.
(bit in) .7i77.0.0.input-NN-not: (NN = 0 to 31) An inverted copy of the inputs provided
for convenience. The two complementary pins may be connected to different signal nets.
(bit out) .7i77.0.0.output-NN: (NN = 0 to 15). 16 digital outputs. The sense of the signal
can be set via a parameter
(bit in) .7i77.0.0.spindir: This pin provides a means to drive the spindle VFD direction
terminals on the 7I76 board.
(bit in) .7i77.0.0.spinena: This pin drives the spindle-enable terminals on the 7I76
board.
(float in) .7i77.0.0.spinout: This controls the analog output of the 7I77. This is
intended as a speed control signal for a VFD.
(bit in) .7i77.0.1.analogena: This pin drives the analog enable terminals on the 7I77
board.
(float in) .7i77.0.1.analogoutN: (N = 0 to 5) This controls the analog output of the 7I77.
Parameters:
(bit rw) .7i77.0.0.output-NN-invert: Invert the sense of the corresponding output pin.
(bit rw) .7i77.0.0.spindir-invert: Invert the sense of the spindle direction pin.
(bit rw) .7i77.0.0.spinena-invert: Invert the sense of the spindle-enable pin.
(float rw) .7i77.0.0.spinout-maxlim: The maximum speed request allowable
(float rw) .7i77.0.0.spinout-minlim: The minimum speed request.
(float rw) .7i77.0.0.spinout-scalemax: The spindle speed scaling. This is the speed
request which would correspond to full-scale output from the spindle control pin. For
example with a 10 V drive voltage and a 10000 RPM scalemax a value of 10,000 RPM on the
spinout pin would produce 10 V output. However, if spinout-maxlim were set to 5,000 RPM
then no voltage above 5 V would be output.
(float rw) .7i77.0.0.analogoutN-maxlim: (N = 0 to 5) The maximum speed request allowable
(float rw) .7i77.0.0.analogoutN-minlim: (N = 0 to 5) The minimum speed request.
(float rw) .7i77.0.0.analogoutN-scalemax: (N = 0 to 5) The analog speed scaling. This is
the speed request which would correspond to full-scale output from the spindle control
pin. For example with a 10 V drive voltage and a 10000 RPM scalemax a value of 10,000 RPM
on the spinout pin would produce 10 V output. However, if spinout-maxlim were set to
5,000 RPM then no voltage above 5 V would be output.
7I69
The 7I69 is a 48 channel digital IO card. It can be configured in four different modes:
MODE 0: Bidirectional mode (48 bits in 48 bits out)
MODE 1: Input only mode (48 bits in)
MODE 2: Output only mode (48 bits out)
MODE 3: 24/24mode (24 bits in = bits 0..23 and 24 bits out = bits 24..47)
MODE 4: Bidirectional mode (48 bits in 48 bits out) plus 4 MPG encoder channels oninputs
0 through 7
Pins:
(bit in) .7i69.0.0.output-NN: Digital output. Sense can be inverted with the corresponding
Parameter.
(bit out) .7i69.0.0.input-NN: Digital input
(bit out) .7i69.0.0.input-NN-not: Digital input, inverted.
Parameters:
(u32 ro) .7i69.0.0.nvbaudrate: Indicates the vbaud rate. This probably should not be
altered.
(u32 ro) .7i69.0.0.nvunitnumber: Indicates the serial number of the device and should
match a sticker on the card. This can be useful for working out which card is which.
(u32 ro) .7i69.0.0.nvwatchdogtimeout: The sserial remote watchdog timeout. This is
separate from the Anything-IO card timeout. This is unlikely to need to be changed.
(bit rw) .7i69.0.0.output-NN-invert: Invert the sense of the corresponding output pin.
(u32 ro) .7i69.0.0.swrevision: The onboard firmware revision number. Utilities exist to
update and change this firmware.
7I70
The 7I70 is a remote isolated 48 input card. The 7I70 inputs sense positive inputs
relative to a common field ground. Input impedance is 10 kΩ and input voltage can range
from 5 VDC to 32 VDC. All inputs have LED status indicators. The input common field
ground is galvanically isolated from the communications link.
The 7I70 has three software selectable modes. These different modes select different sets
of 7I70 data to be transferred between the host and the 7I70 during real time process data
exchanges. For high speed applications, choosing the correct mode can reduced the data
transfer sizes, resulting in higher maximum update rates.
MODE 0: Input mode (48 bits input data only
MODE 1: Input plus analog mode (48 bits input data plus 6 channels of analog data)
MODE 2: Input plus field voltage
Pins:
(float out) .7i70.0.0.analogN (modes 1 and 2 only) Analogue input values.
(float out) .7i70.0.0.fieldvoltage (mode 2 only) Field voltage monitoring pin.
(bit out) .7i70.0.0.input-NN: (NN = 0 to 47) 48 digital inputs.
(bit in) .7i70.0.0.input-NN-not: (NN = 0 to 47) An inverted copy of the inputs provided
for convenience. The two complementary pins may be connected to different signal nets.
Parameters:
(u32 ro) .7i70.0.0.nvbaudrate: Indicates the vbaud rate. This probably should not be
altered.
(u32 ro) .7i70.0.0.nvunitnumber: Indicates the serial number of the device and should
match a sticker on the card. This can be useful for working out which card is which.
(u32 ro) .7i70.0.0.nvwatchdogtimeout: The sserial remote watchdog timeout. This is
separate from the Anything-IO card timeout. This is unlikely to need to be changed.
(u32 ro) .7i69.0.0.swrevision: The onboard firmware revision number. Utilities exist to
update and change this firmware.
7I71
The 7I71 is a remote isolated 48 output card. The 48 outputs are 8VDC to 28VDC sourcing
drivers (common + field power) with 300 mA maximum current capability. All outputs have
LED status indicators.
The 7I71 has two software selectable modes. For high speed applications, choosing the
correct mode can reduced the data transfer sizes, resulting in higher maximum update rates
MODE 0: Output only mode (48 bits output data only)
MODE 1: Outputs plus read back field voltage
Pins:
(float out) .7i71.0.0.fieldvoltage (mode 2 only) Field voltage monitoring pin.
(bit out) .7i71.0.0.output-NN: (NN = 0 to 47) 48 digital outputs. The sense may be
inverted by the invert parameter.
Parameters:
(bit rw) .7i71.0.0.output-NN-invert: Invert the sense of the corresponding output pin.
(u32 ro) .7i71.0.0.nvbaudrate: Indicates the vbaud rate. This probably should not be
altered.
(u32 ro) .7i71.0.0.nvunitnumber: Indicates the serial number of the device and should
match a sticker on the card. This can be useful for determining which card is which.
(u32 ro) .7i71.0.0.nvwatchdogtimeout: The sserial remote watchdog timeout. This is
separate from the Anything-IO card timeout. This is unlikely to need to be changed.
(u32 ro) .7i69.0.0.swrevision: The onboard firmware revision number. Utilities exist to
update and change this firmware.
7I73
The 7I73 is a remote real time pendant or control panel interface.
The 7I73 supports up to four 50 kHz encoder inputs for MPGs, 8 digital inputs and 6
digital outputs and up to a 64 Key keypad. If a smaller keypad is used, more digital
inputs and outputs become available. Up to eight 0.0 V to 3.3 V analog inputs are also
provided. The 7I73 can drive a 4 line 20 character LCD for local DRO applications.
The 7I73 has 3 software selectable process data modes. These different modes select
different sets of 7I73 data to be transferred between the host and the 7I73 during real
time process data exchanges. For high speed applications, choosing the correct mode can
reduced the data transfer sizes, resulting in higher maximum update rates
MODE 0: I/O + ENCODER
MODE 1: I/O + ENCODER + ANALOG IN
MODE 2: I/O + ENCODER + ANALOG IN FAST DISPLAY
Pins:
(float out) .7i73.0.0.analoginN: Analogue inputs. Up to 8 channels may be available
dependent on software and hardware configuration modes (see the PDF manual downloadable
from www.mesanet.com).
(u32 in) .7i73.0.1.display (modes 1 and 2). Data for LCD display. This pin may be
conveniently driven by the HAL "lcd" component which allows the formatted display of the
values any number of HAL pins and textual content.
(u32 in) .7i73.0.1.display32 (mode 2 only). 4 bytes of data for LCD display. This mode is
not supported by the HAL "lcd" component.
(s32 out) .7i73.0.1.encN: The position of the MPG encoder counters.
(bit out) .7i73.0.1.input-NN: Up to 24 digital inputs (dependent on config)
(bit out) .7i73.0.1.input-NN-not: Inverted copy of the digital inputs
(bit in) .7i73.0.1.output-NN: Up to 22 digital outputs (dependent on config)
Parameters:
(u32 ro) .7i73.0.1.nvanalogfilter
(u32 ro) .7i73.0.1.nvbaudrate
(u32 ro) .7i73.0.1.nvcontrast
(u32 ro) .7i73.0.1.nvdispmode
(u32 ro) .7i73.0.1.nvencmode0
(u32 ro) .7i73.0.1.nvencmode1
(u32 ro) .7i73.0.1.nvencmode2
(u32 ro) .7i73.0.1.nvencmode3
(u32 ro) .7i73.0.1.nvkeytimer
(u32 ro) .7i73.0.1.nvunitnumber
(u32 ro) .7i73.0.1.nvwatchdogtimeout
(u32 ro) .7i73.0.1.output-00-invert
For further details of the use of the above see the Mesa manual.
(bit rw) .7i73.0.1.output-01-invert: Invert the corresponding output bit.
(s32 ro) .7i73.0.1.swrevision: The version of firmware installed.