GMI RS422 User manual

D1061-077 - RS422 / RS485 Fieldbus Isolating Repeater ISM0146-0
D1061S-077
INSTRUCTION MANUAL
RS422/RS485 Fieldbus
Isolating Repeater
DIN-Rail Model D1061S-077

2 D1061-077 - RS422 / RS485 Fieldbus Isolating Repeater G.M. International ISM0146-0
General Description: The DIN-Rail RS422 / RS485 Fieldbus Isolating Repeater type D1061S-077 is used to separate Intrinsically Safe RS422 / RS485 equipment located in
Hazardous Area from a RS232 / RS422 / RS485 controller located in Safe Area. Transmission speed is DIP-switch adjustable from 1.2 Kbit/s up to 1.5 Mbit/s.
Terminating impedance is DIP-switch selectable inside the unit (200 value) for both sides of communication lines (Hazardous Area and Safe Area side).
RS422 / RS485 connection in Safe Area is provided both on terminal block and SUB D 9 poles female connector on the unit.
RS232 connection is provided on SUB D 9 poles female connector only. The module also provides a shield terminal block for connecting cable shielding on Hazardous Area side.
Function: 1 channel I.S. RS422 / RS485 isolating repeater, provides 3 port isolation (input/output/supply).
Signalling LEDs: Power supply indication (green), Rx-Tx transmission (yellow).
Field Configurability: Hardware is totally configurable via DIP-switches; parameters are: transmission speed adjustable from 1.2 Kbit/s up to 1.5 Mbit/s;
terminating impedance enabled or disabled in both communication lines; RS422 / RS485 connection selection from terminal blocks or SUB D 9 poles female connector.
EMC: Fully compliant with CE marking applicable requirements.
Supply: 24 Vdc nom (20 to 30 Vdc) reverse polarity protected, ripple within voltage limits 5 Vpp.
Current consumption @ 24 V: 100 mA with 1.5 Mbit/s transmission speed, typical.
Power dissipation: 2.0 W with 24 V supply and 1.5 Mbit/s transmission speed typical.
Max. power consumption: at 30 V supply and 1.5 Mbit/s transmission speed, 2.8 W.
Isolation (Test Voltage): I.S. RS422-RS485 / RS232-RS422-RS485 1.5 KV; I.S. RS422-RS485 / Supply 1.5 KV; RS232-RS422-RS485 / Supply 500 V.
Input/Output I.S. Hazardous Area: RS422 / RS485 Intrinsically Safe connection (EIA RS422-A and EIA RS485 applicable standard).
Terminating impedance: 200 DIP-switch selectable.
Transmission speed: 1.2, 2.4, 4.8, 9.6, 14.4, 19.2, 38.4, 57.6, 93.75, 115.2, 187.5, 375, 500, 750 Kbit/s or 1.0, 1.5 Mbit/s DIP-switch configurable.
Transmission cable length: 1200 m up to 93.75 Kbit/s, 1000 m up to 187.5 Kbit/s, 400 m up to 500 Kbit/s, 200 m up to 1.5 Mbit/s.
Connection: by plug-in disconnect screw terminal block to accomodate terminations up to 2.5 mm2, shield terminal block provided for cable connection.
Output/Input Safe Area: RS232 / RS422 / RS485 connection (EIA RS232-C, EIA RS422-A and EIA RS485 applicable standard).
RS422 / RS485 Terminating impedance: 200 DIP-switch selectable.
RS422 / RS485 Transmission speed: 1.2, 2.4, 4.8, 9.6, 14.4, 19.2, 38.4, 57.6, 93.75, 115.2, 187.5, 375, 500, 750 Kbit/s or 1.0, 1.5 Mbit/s DIP-switch configurable.
RS422 / RS485 Transmission cable length: 1200 m up to 93.75 Kbit/s, 1000 m up to 187.5 Kbit/s, 400 m up to 500 Kbit/s, 200 m up to 1.5 Mbit/s.
RS422 / RS485 Connection: by plug-in disconnect screw terminal block to accomodate terminations up to 2.5 mm2or SUB D 9 poles female connector
(requires SUB D 9 poles male mating connector), DIP-switch configurable.
RS232 Transmission speed: 1.2, 2.4, 4.8, 9.6, 14.4, 19.2, 38.4, 57.6, 93.75, 115.2 Kbit/s DIP-switch configurable.
RS232 Transmission cable length: 15 m up to 115.2 Kbit/s.
RS232 Connection: SUB D 9 poles female connector (requires SUB D 9 poles male mating connector).
Compatibility:
CE mark compliant, conforms to 94/9/EC Atex Directive and to 2004/108/CE EMC Directive.
Environmental conditions: Operating: temperature limits -20 to + 60 °C, relative humidity max 90 % non condensing, up to 35 °C.
Storage: temperature limits – 45 to + 80 °C.
Safety Description:
ATEX: II 3(1) G Ex nA [ia Ga] IIC T4 Gc, II (1) D [Ex ia Da] IIIC, I (M1) [Ex ia Ma] I
IECEx: Ex nA [ia Ga] IIC T4 Gc, [Ex ia Da] IIIC, [Ex ia Ma] I,
associated apparatus and non-sparking electrical equipment.
Uo/Voc = 3.7 V, Io/Isc = 93 mA, Po/Po = 85 mW at terminals 13-14 and 15-16.
Ui/Vmax = 30 V, Ii/Imax = 136 mA, Ci = 0 nF, Li = 0 nH at terminals 13-14 and 15-16.
Um = 250 Vrms, -20 °C Ta 60 °C.
Approvals:
DMT 01 ATEX E 042 X conforms to EN60079-0, EN60079-11, EN60079-15, EN60079-26, EN61241-11,
IECEx BVS 07.0027X conforms to IEC60079-0, IEC60079-11, IEC60079-15, IEC60079-26, IEC61241-11.
DNV No.A-13778 Certificates for maritime applications.
Mounting: T35 DIN Rail according to EN50022.
Weight: about 170 g.
Connection: by polarized plug-in disconnect screw terminal blocks to accomodate terminations up to 2.5 mm2and SUB D 9 poles (DB9) DIN 41652 female connector
(only for RS232, RS422, RS485 Safe Area connection).
Location: Safe Area or Zone 2, Group IIC T4 installation.
Protection class: IP 20.
Dimensions: Width 22.5 mm, Depth 99 mm, Height 114.5 mm.
Technical Data
Characteristics

3
D1061-077 - RS422 / RS485 Fieldbus Isolating RepeaterG.M. International ISM0146-0
Ordering Information
Model: D1061S-077
Power Bus enclosure /B
Front Panel and Features
Input/Output from Zone 0 (Zone 20), installation in Zone 2.
RS422 / RS485 Hazardous Area I.S. Signal.
RS232 / RS422 / RS485 Safe Area Signal.
Transmission speed up to 1.5 Mbit/s.
Three port isolation, Input/Output/Supply.
EMC Compatibility to EN61000-6-2, EN61000-6-4.
In-field programmability by DIP Switch.
ATEX, IECEx Certifications.
High Reliability, SMD components.
Simplified installation using standard DIN Rail and plug-in terminal blocks.
250 Vrms (Um) max. voltage allowed to the instruments associated with the barrier.
To shield
Terminal Block Connections
HAZARDOUS AREA SAFE AREA
To shield
Not used
Not used
A - for IN/OUT RS485 orTxD RS422
B + for IN/OUT RS485 orTxD RS422
A - for RxD RS422
B - for RxD RS422
9
10
11
12
13
14
15
16
Not used
1
Not used
2
+ Power Supply 24 Vdc
3
- Power Supply 24 Vdc
4
A - for IN/OUT RS485 orTxD RS422
5
B + for IN/OUT RS485 orTxD RS422
6
A - for RxD RS422
7
B - for RxD RS422
8

4 D1061-077 - RS422 / RS485 Fieldbus Isolating Repeater G.M. International ISM0146-0
Parameters Table
Must
be
Hazardous Area/
Hazardous Locations
Device Parameters
D1061-077 Associated
Apparatus Parameters
Must
be
Hazardous Area/
Hazardous Locations
Device + Cable Parameters
Uo / Voc = 3.7 V Ui / Vmax
In the system safety analysis, always check the Hazardous Area devices to conform with the related system documentation, if the device is Intrinsically Safe check its suitability for
the Hazardous Area and group encountered and that its maximum allowable voltage, current, power (Ui/Vmax, Ii/Imax, Pi/Pi) are not exceeded by the safety parameters
(Uo/Voc, Io/Isc, Po/Po) of the D1061-077 Associated Apparatus connected to it. Also consider the maximum operating temperature of the field device, check that added connecting
cable and field device capacitance and inductance do not exceed the limits (Co/Ca, Lo/La, Lo/Ro) given in the Associated Apparatus parameters for the effective group.
See parameters on enclosure side and the ones indicated in the table below:
D1061-077
Terminals
13 - 14
15 - 16

Pi / Pi
D1061-077
Terminals
13 - 14
D1061-077 Associated
Apparatus Parameters
Ci / Ci device + C cable
IIC
Co / Ca = 100 µF
Co / Ca = 1000 µF
Co / Ca = 1000 µF
IIB
IIA
IIC
Lo / La = 4.1 mH
Lo / La = 16.7 mH
Lo / La = 33.4 mH
IIB
IIA
IIC
Lo / Ro = 422.7 µH/
Lo / Ro = 1690.9 µH/
Lo / Ro = 3381.9 µH/
IIB
IIA
Io / Isc = 93 mA
13 - 14
15 - 16
Ii/ Imax
Po / Po = 85 mW
13 - 14
15 - 16

Li / Li device + L cable

Li / Ri device and
L cable / R cable

15 - 16
13 - 14
15 - 16
13 - 14
15 - 16
When used with separate powered intrinsically safe devices, check that maximum allowable voltage, current (Ui/Vmax. Li/Imax) of the D1061-077 Associated Apparatus
are not exceeded by the safety parameters (Uo/Voc, Io/Isc) of the Intrinsically Safe device, indicated in the table below:
For installations in which both the Ci and Li of the Intrinsically Safe apparatus exceed 1 % of the Co and Lo parameters of the Associated Apparatus (excluding the cable),
then 50 % of Co and Lo parameters are applicable and shall not be exceeded (50 % of the Co and Lo become the limits which must include the cable such that
Ci device + C cable 50 % of Co and Li device + L cable 50 % of Lo).
If the cable parameters are unknown, the following value may be used: Capacitance 60pF per foot (180pF per meter), inductance 0.20µH per foot (0.60µH per meter).
Must
be
Hazardous Area/
Hazardous Locations
Device Parameters
D1061-077 Associated
Apparatus Parameters
Ui / Vmax = 30V Uo / Voc
D1061-077
Terminals
13 - 14
15 - 16
li / Imax = 136 mA
13 - 14
15 - 16

Io / Isc
Ci = 0 nF, Li= 0 nH
13 - 14
15 - 16

5
D1061-077 - RS422 / RS485 Fieldbus Isolating RepeaterG.M. International ISM0146-0
Function Diagram
HAZARDOUS AREA ZONE 0 (ZONE 20) GROUP IIC SAFE AREA, ZONE 2 GROUP IIC T4
MODEL D1061S-077
==
=
13
14
15
3 +
4 -
5
6
7
Supply 24 Vdc
8
6
5
8
3
9
4
A -
B +
A -
16
B +
9
10
IN/OUT RS485
TxD RS422
RxD RS422
A -
B +
A -
B +
IN/OUT RS485
TxD RS422
RxD RS422
=
=
+5 V
SUB D 9 poles female connector
MODEL D1061S-077
==
=
13
14
15
3 +
4 - Supply 24 Vdc
5
2
3
A -
B +
A -
16
B +
9
10
IN/OUT RS485
TxD RS422
RxD RS422
RxD
TxD IN/OUT RS232
=
=
SUB D 9 poles female connector
GND

6 D1061-077 - RS422 / RS485 Fieldbus Isolating Repeater G.M. International ISM0146-0
D1061-077 is an isolated Intrinsically Safe Associated Apparatus installed into standard EN50022 T35 DIN Rail located in Safe Area or Zone 2, Group IIC, Temperature Classification T4
Hazardous Area (according to EN/IEC60079-15) within the specified operating temperature limits Tamb -20 to +60 °C, and connected to equipment with a maximum limit for
AC power supply Um of 250 Vrms.
The wiring between the Intrinsically Safe Equipment located in Hazardous Area and the D1061-077 Associated Apparatus must have a minimum insulation thickness of 0.25 mm.
Not to be connected to control equipment that uses or generates more than 250 Vrms or Vdc with respect to earth ground.
D1061-077 must be installed, operated and maintained only by qualified personnel, in accordance to the relevant national/international installation standards
(e.g. IEC/EN60079-14 Electrical apparatus for explosive gas atmospheres - Part 14: Electrical installations in hazardous areas (other than mines), BS 5345 Pt4, VDE 165,
ANSI/ISA RP12.06.01 Installation of Intrinsically Safe System for Hazardous (Classified) Locations, National Electrical Code NEC ANSI/NFPA 70 Section 504 and 505,
Canadian Electrical Code CEC) following the established installation rules, particular care shall be given to segregation and clear identification of I.S. conductors from non I.S. ones.
De-energize power source (turn off power supply voltage) before plug or unplug the terminal blocks when installed in Hazardous Area or unless area is known to be nonhazardous.
Warning: substitution of components may impair Intrinsic Safety and suitability for Zone 2.
Explosion Hazard: to prevent ignition of flammable or combustible atmospheres, disconnect power before servicing or unless area is known to be nonhazardous.
Failure to properly installation or use of the equipment may risk to damage the unit or severe personal injury.
The unit cannot be repaired by the end user and must be returned to the manufacturer or his authorized representative. Any unauthorized modification must be avoided.
Warning
Operation
The DIN-Rail RS422 / RS485 Fieldbus Isolating Repeater type D1061S-077 is used to separate Intrinsically Safe RS422 / RS485 equipment located in Hazardous Area from
a RS232 / RS422 / RS485 controller located in Safe Area. Transmission speed is DIP-switch adjustable from 1.2 Kbit/s up to 1.5 Mbit/s.
Terminating impedance is DIP-switch selectable inside the unit (200 value) for both sides of communication lines (Hazardous Area and Safe Area side).
RS422 / RS485 connection in Safe Area is provided both on terminal block and SUB D 9 poles female connector on the unit.
RS232 connection is provided on SUB D 9 poles female connector only. The module also provides a shield terminal block for connecting cable shielding on Hazardous Area side.
A “POWER ON” green led lits when input power is present, two yellow leds monitor the transmission activities.
D1061-077
Associated Apparatus
Safe Area or
Hazardous Area
Zone 2, Group IIC, IIB, IIA, T-Code T4
Hazardous Area
Zone 0, Group IIC, IIB, IIA
Zone 20, Group IIIC, IIIB, IIIA
Intrinsically
Safe Equipment
Must not use or generate
more than 250 Vrms or Vdc
Control
Equipment
Safe Area
Safe Area or
Hazardous Area
Zone 2, Group IIC, IIB, IIA, T-Code T4
Hazardous Area
Zone 2, Group IIC, IIB, IIA
Zone 22, Group IIIC, IIIB, IIIA
Non-incendive
Equipment
Safe Area
13
14
5
6
A-
B+
A-
B+
-
+
Power Supply
3
4
Must not use or generate
more than 250 Vrms or Vdc
15
16
A-
B+ B+
A-
8
7
Note: wiring between I.S. Equipment and D1061-077
must have a minimum insulation thickness of 0.25 mm
A-
B+
+
-
A-
B+
Power Supply
Control
Equipment
Note: wiring between I.S. Equipment and D1061-077
must have a minimum insulation thickness of 0.25 mm
D1061-077
Associated Apparatus
13
16
15
14
5
8
3
4
7
6
A-
B+
A-
B+

7
D1061-077 - RS422 / RS485 Fieldbus Isolating RepeaterG.M. International ISM0146-0
Start-up
Before powering the unit check that all wires are properly connected, particularly supply conductors and their polarity, input and output wires, also check that Intrinsically Safe conductors
and cable trays are segregated (no direct contacts with other non I.S. conductors) and identified either by color coding, preferably blue, or by marking.
Check conductors for exposed wires that could touch each other causing dangerous unwanted shorts.
Turn on power, the “power on” green led must be lit, transmission led should reflect the communication line activity.
Installation
D1061-077 is a RS232/RS422/RS485 fieldbus isolating repeater housed in a plastic enclosure suitable for installation on T35 DIN Rail according to EN50022.
D1061-077 unit can be mounted with any orientation over the entire ambient temperature range, see section “Installation in Cabinet” and
"Installation of Electronic Equipments in Cabinet" Instruction Manual D1000 series for detailed instructions.
Electrical connection of conductors up to 2.5 mm² are accommodated by polarized plug-in removable screw terminal blocks which can be plugged in/out into a powered unit
without suffering or causing any damage; for RS232, RS422 and RS485 serial line connection in Safe Area, a SUB D 9 poles female connector is also provided
(for Zone 2 installations check the area to be nonhazardous before servicing).
The wiring cables have to be proportionate in relation to the current and the length of the cable.
On the section “Function Diagram” and enclosure side a block diagram identifies all connections and configuration DIP switches.
Identify the function and location of each connection terminal using the wiring diagram on the corresponding section, as an example:
Connect 24 Vdc power supply positive at terminal “3” and negative at terminal “4”.
Connect field serial line type RS485 or receiving section of RS422 in Hazardous Area at terminal “13” and “14” corresponding to A- and B+.
In addition when using RS422 serial line, connect transmitting section at terminal “15” and “16” corresponding to A- and B+.
Connect field serial line type RS485 or receiving section of RS422 in Safe Area at terminal “5” and “6” corresponding to A- and B+.
In addition when using RS422 serial line, connect transmitting section at terminal “7” and “8” corresponding to A- and B+.
Safe Area side connection are also available on SUB D 9 poles female connector.
Note: please pay attention to the serial cable used for Safe Area connection. The internal wiring of the cable must be straight.
Intrinsically Safe conductors must be identified and segregated from non I.S. and wired in accordance to the relevant national/international installation standards
(e.g. EN/IEC60079-14 Electrical apparatus for explosive gas atmospheres - Part 14: Electrical installations in hazardous areas (other than mines), BS 5345 Pt4, VDE 165,
ANSI/ISA RP12.06.01 Installation of Intrinsically Safe System for Hazardous (Classified) Locations, National Electrical Code NEC ANSI/NFPA 70 Section 504 and 505,
Canadian Electrical Code CEC), make sure that conductors are well isolated from each other and do not produce any unintentional connection.
The wiring between the Intrinsically Safe Equipment located in Hazardous Area and the D1061-077 Associated Apparatus must have a minimum insulation thickness of 0.25 mm.
The enclosure provides, according to EN60529, an IP20 minimum degree of mechanical protection (or similar to NEMA Standard 250 type 1) for indoor installation, outdoor installation
requires an additional enclosure with higher degree of protection (i.e. IP54 to IP65 or NEMA type 12-13) consistent with the effective operating environment of the specific installation.
Units must be protected against dirt, dust, extreme mechanical (e.g. vibration, impact and shock) and thermal stress, and casual contacts.
If enclosure needs to be cleaned use only a cloth lightly moistened by a mixture of detergent in water.
Electrostatic Hazard: to avoid electrostatic hazard, the enclosure of D1061-077 must be cleaned only with a damp or antistatic cloth.
Any penetration of cleaning liquid must be avoided to prevent damage to the unit. Any unauthorized card modification must be avoided.
According to EN61010, D1061-077 series must be connected to SELV or SELV-E supplies.
Power Dissipation of D1061-077 Isolators
Section “Technical Data” of D1061-077 isolator specifies the current consumption (maximum current from the nominal power supply, typical 24 Vdc, in normal operation);
this data serves to dimension the current rating of the power supply unit. Section “Technical Data” indicates also the maximum power consumption (maximum power required from the
power supply in the worst (abnormal) operating conditions like for example supply voltage at 30 Vdc, short circuit on the outputs and on the input terminals.
The power dissipated Pd inside the enclosure is: Pd = Current Consumption (A) * Supply Voltage (V) - Power Dissipated into the input/output loads
Isolators are not running at the maximum current all at the same time, the average power consumption of a multitude of isolators can be considered to be only 70 % of the value obtained
from the section “Technical Data”. Considering the power dissipated by the load (typical 1/5 of input power), and the 70 % above discussed, the power effectively dissipated internally
by the isolators can therefore become 60 % of the actual power delivered by the power supply.
The following tables give advises for DIN-Rail orientation (vertical or horizontal) of barriers mounting, or installation on custom board assembly.
A) Cabinet with Natural Ventilation
Maximum recommended ambient temperature in °C depending on installation method:
Installation in Cabinet
Any orientation Vertical Horizontal
Installation of Multiple units with DIN-Rail BusSingle unit Installation
Type of Isolator
Vertical Horizontal
Installation on Custom Boards
B) Cabinet with Forced Ventilation
Maximum recommended ambient temperature in °C depending on installation method:
Any orientation Vertical Horizontal
Installation of Multiple units with DIN-Rail BusSingle unit Installation Type of Isolator
60°C 40°C 45°C
Vertical Horizontal
Installation on Custom Boards
45°C 55°C D1061S-077
60°C 30°C 35°C
D1061S-077 35°C 40°C

8 D1061-077 - RS422 / RS485 Fieldbus Isolating Repeater G.M. International ISM0146-0
12
78
4
4
Configuration
Proper configuration is obtained using internal dip-switches. The user can configure the operating mode on both Hazardous and Safe side, as RS422, RS485, RS232
(RS232 is available only on Safe side), the baud rate of the communication from 1200 b/s to 1.5 Mb/s and the frame length of a byte, indicated as data size (7 or 8 bit),
parity (none, even or odd) and number of stop bit (1 or 2). The connection of line terminating resistors can also be configured.
Dip switch configuration
Side A Panel View
SW2SW3
Safe Area
Serial Line
Connection Type
RS232
RS422 5 V on pin 6
SUB D connector
Unconnected pin 6
SUB D connector
RS485
3456
6
5
5
21 3
6
Safe Area
Termination
200 between
A- and B+
Disabled
Termination Resistor Configuration
Serial Line Type Hardware Configuration
8
7
ON ON
1234
ON
678
5
1234
ON
678
5
SW2
SW3
Serial Line Type
Hardware Configuration
Termination Resistor
Configuration
(Safe Area)
ON ON
OFF OFF
ON ON OFF OFF OFF OFF
OFF OFF ON
ON ON
4
4
5 V on pin 6
SUB D connector
Unconnected pin 6
SUB D connector
21 3
OFF OFF ON
ON OFF
ON
OFF
ON
OFF

9
D1061-077 - RS422 / RS485 Fieldbus Isolating RepeaterG.M. International ISM0146-0
4
4
4
4
3
3
3
3
2
1
2
1
2
1
21
ON
Side A Panel View
Dip switch configuration
SW2SW3
Serial Line Type Configuartion
Hazardous Area Serial Line Safe Area Serial Line
RS422 RS422 or RS232
RS422 RS485
RS485 RS422 or RS232
RS485 RS485
ON
OFF ON
ON OFF
OFF OFF
Message format Configuration
OFF
Bit Frame Structure Total # bit
7 data bit, no parity, 1 stop bit 9
7 data bit, no parity, 2 stop bit
7 data bit, odd parity, 1 stop bit
7 data bit, even parity, 1 stop bit
8 data bit, no parity, 1 stop bit
10
10
10
10
OFF
ON OFF
OFF ON
ON ON
7 data bit, odd parity, 2 stop bit
7 data bit, even parity, 2 stop bit
8 data bit, no parity, 2 stop bit
8 data bit, odd parity, 1 stop bit
8 data bit, even parity, 1 stop bit
11
11
11
11
11
8 data bit, odd parity, 2 stop bit
8 bit data, even parity, 2 stop bit
12
12
1234
ON
678
5
1234
ON
678
5
SW2
SW3
Serial Line Type
Configuration
Message format
Configuration Baud rate
Configuration
ON ON

10 D1061-077 - RS422 / RS485 Fieldbus Isolating Repeater G.M. International ISM0146-0
21
1 2
8
7
6
5
Side B Panel View
OFF
Baud rate Configuration
Baud Rate
1.500.000 OFF OFF OFF
OFF1.000.000 OFF OFF ON
OFF
750.000 OFF ON OFF
OFF500.000 OFF ON ON
OFF375.000 ON OFF OFF
OFF187.500 ON OFF ON
OFF93.750 ON ON OFF
OFF
115.200 ON ON ON
ON
57.600 OFF OFF OFF
ON38.400 OFF OFF ON
ON19.200 OFF ON OFF
ON
14.400 OFF ON ON
ON9.600 ON OFF OFF
ON4.800 ON OFF ON
ON2.400 ON ON OFF
ON1.200 ON ON ON
Hazardous
Area
Termination
200 between
A- and B+
Disabled
SW1
1234
ON
Switch positions
Termination Resistor
Configuration
(Hazardous Area)
SW1
ON
ON ON
OFF OFF
Termination Resistor Configuration