Provided by: nut-modbus_2.8.0-7_amd64 
NAME
generic_modbus - Driver for contact (direct) signal UPS devices connected via modbus
remote I/O gateways
SYNOPSIS
generic_modbus -h
generic_modbus -a DEVICE_NAME [OPTIONS]
Note
This man page only documents the specific features of the generic_modbus driver. For
information about the core driver, see nutupsdrv(8).
SUPPORTED HARDWARE
This is a generic modbus driver expected to work with contact (direct) signal UPS devices,
connected via modbus RIO (remote I/O) either serial or TCP/IP.
The driver has been tested against PULS UPS (model UB40.241) via MOXA ioLogikR1212 (RS485)
and ioLogikE1212 (TCP/IP).
More information about this UPS can be found here:
https://products.pulspower.com/ca/ubc10-241-n1.html
More information about Moxa ioLogik R1212, E1212 can be found here:
https://www.moxa.com/en/products/industrial-edge-connectivity/controllers-and-ios
The PULS UPS UB40.241 supports the following signals:
Ready contact (DO) <--> HB
Buffering contact (DO) <--> OL | OB
Battery-low (DO) <--> LB
Replace Battery (DO) <--> RB
Inhibit (DI) <--> FSD
Digital port direction (DI/DO) assumes the device perspective
The driver’s concept is to map the UPS states (as defined in NUT) onto UPS contacts'
states. The driver has an extended configuration interface implemented using variables
defined in ups.conf.
HARDWARE INTERCONNECTION
The commission of modbus remote I/O server as well as UPS device is carried out following
the corresponding instruction manuals. The following figure depicts the anticipated
communication path and hardware interconnection:
+------+ +----------------+ +------------+ +------------+
| UPSD | <---> | GENERIC_MODBUS | <---> | MODBUS RIO | <---> | UPS DEVICE |
+------+ (1) +----------------+ (2) +------------+ (3) +------------+
| |
+-------------------+
HOST CONTROLLER
(1) Unix IPC
(2) RS232 | TCP/IP
(3) contacts
EXTRA ARGUMENTS
This driver supports the following optional settings in the ups.conf(5) file:
Generic:
device_mfr=value
A string specifying the manufacturer of the UPS device (default UNKNOWN).
device_model=value
A string specifying the model of the UPS device (default UNKNOWN).
Serial:
ser_baud_rate=value
A integer specifying the serial port baud rate (default 9600).
ser_data_bit=value
A integer specifying the serial port data bit (default 8).
ser_parity=value
A character specifying the serial port parity (default N).
ser_stop_bit=value
An integer specifying the serial port stop bit (default 1).
Modbus:
rio_slave_id=value
An integer specifying the RIO modbus slave ID (default 1).
States (X = OL, OB, LB, HB, RB, CHRG, DISCHRG, FSD)
<X>_addr=value
A number specifying the modbus address for the X state.
<X>_regtype=value
A number specifying the modbus register type for the X state
Default values:
1 for X = OL, OB, LB ,HB, RB, CHRG, DISCHRG
0 for X = FSD
Valid values:
0:COIL, 1:INPUT_B, 2:INPUT_R, 3:HOLDING
<X>_noro=value
A number specifying the contact configuration for the X state (default 1).
Valid values:
0:NC, 1:NO
Note
NO stands for normally open and NC for normally closed contact
Shutdown
FSD_pulse_duration=value
A number specifying the duration in ms for the inhibit pulse. If it’s not defined,
signal has only one transition depending on FSD_noro configuration.
Examples for FSD signal configuration:
FSD_noro = 1
FSD_pulse_duration = 150
+-----+
| |
inhibit pulse >-----+ +------------------>
<--->
150ms
FSD_noro = 0
inhibit pulse >-----+
|
+------------------------>
CONFIGURATION
Here is an example of generic_modbus driver configuration in ups.conf file:
[generic_modbus]
driver = generic_modbus
port = /dev/ttyUSB0
desc = "generic ups driver"
# device info
device_mfr = "PULS"
device_model = "UB40.241"
# serial settings
ser_baud_rate = 9600
ser_parity = N
ser_data_bit = 8
ser_stop_bit = 1
# modbus slave id
rio_slave_id = 5
# UPS signal state attributes
OB_addr = 0x0
OB_regtype = 1
OB_noro = 0
LB_addr = 0x1
LB_regtype = 1
HB_addr = 0x2
HB_regtype = 1
RB_addr = 0x3
RB_regtype = 1
FSD_addr = 0x0
FSD_regtype = 0
FSD_pulse_duration = 150
INSTANT COMMANDS
This driver support the following instant commands:
load.off
executes "instant poweroff"
INSTALLATION
This driver is not built by default. You can build it by installing libmodbus and running
configure --with-modbus=yes.
You also need to give proper permissions on the local serial device file (/dev/ttyUSB0 for
example) to allow the run-time NUT driver user account to access it.
OTHER NOTES
The generic_modbus driver intends to support generic UPS devices with contact signals
through modbus TCP/RTU gateways (also known as RIO — remote I/Os). The data and signal
path looks like this:
[UPSD] <--- IPC ---> [GENERIC_UPS] <--- modbus TCP/RTU ---> MODBUS-RIO <--- contacts ---> [UPS DEVICE]
On the other hand, you can setup any kind of modbus server, and configure the
generic_modbus driver to connect and read or write specific registers. Your application /
modbus server could then drive NUT statuses (e.g. OL, OB, HB etc) by writing over those
registers.
AUTHOR
Dimitris Economou <dimitris.s.economou@gmail.com>
SEE ALSO
The core driver:
nutupsdrv(8), ups.conf(5)
Internet resources:
• The NUT (Network UPS Tools) home page: http://www.networkupstools.org/
• libmodbus home page: http://libmodbus.org