Vaisala GMP251 User manual

M211920EN-C

Quick Guide

GMP251 and GMP252

Relay Box for GMP250 Carbon Dioxide Probes

PUBLISHED BY

Vaisala Oyj

Vanha Nurmijärventie 21, FI-01670 Vantaa, Finland

P.O. Box 26, FI-00421 Helsinki, Finland

+358 9 8949 1

Visit our Internet pages at www.vaisala.com.

No part of this manual may be reproduced,

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responsibilities related thereto.

This manual does not create any legally binding

obligations for Vaisala towards customers or end

users. All legally binding obligations and

agreements are included exclusively in the

applicable supply contract or the General

Conditions of Sale and General Conditions of

Service of Vaisala.

This product contains software developed by

Vaisala or third parties. Use of the software is

governed by license terms and conditions

included in the applicable supply contract or, in

the absence of separate license terms and

conditions, by the General License Conditions of

Vaisala Group.

1. Relay Box Quick Guide

1.1 Overview

The GMP250 relay box allows using the analog current (mA) output channel of Vaisala

CARBOCAPâCarbon Dioxide Probes GMP251 and GMP252 for relay control.

The voltage (V) output channel is not used for relay control with the relay box: the voltage

channel provides CO2measurement output (feedthrough via the relay box) in the same

manner as when wired directly without the relay box.

The relay conﬁguration (activation and release limits, error state output) is done using

GMP251/252 serial line interface commands.

Table 1 GMP250 Relay Box Speciﬁcations

Property Speciﬁcation

Maximum switching voltage 50 VDC, 50 VAC

Maximum switching power 30 W, 30 VA

Number of relays 1

Probe output to relay • Current output to relay control: ppm CO2

• Voltage output through the relay box: ppm CO2or

% CO2

Probe power supply requirements 20 ... 30 VDC supplied through the relay box

Relay conﬁguration interface Serial line (Vaisala Industrial Protocol)

Using GMP251/252 for relay control requires using the Vaisala Industrial Protocol serial line

interface to conﬁgure the probe to use relays, and wiring the probe to send output and

receive power through the relay box.

• For instructions on carrying out the serial line conﬁguration, see Serial Line

Conﬁguration (page 4).

• For wiring instructions, see Probe and Relay Box Wiring (page 10) .

This Quick Guide instructs how to carry out the serial line conﬁguration and wiring related

to using the current output for relay control. For more information on GMP251/252 serial

line commands and other functionalities, see the user documentation of the probes:

•GMP251 User Guide (M211799EN)

•GMP252 User Guide (M211897EN)

Chapter 1 – Relay Box Quick Guide

1.2 Serial Line Conﬁguration

To enable relay operation, you must use a terminal program (for example, PuTTy) to set the

GMP251/252 serial mode to relay communication and conﬁgure the relay settings. Using

serial line (Vaisala Industrial Protocol) to conﬁgure the probe requires the following:

• Vaisala USB service cable (order code 242659)

• Computer with:

• Windows operating system

• Terminal application (for example PuTTy, available from www.vaisala.com/

software)

• Free USB port

• Driver for Vaisala USB service cable installed (available on the cable installation

media and at www.vaisala.com/software)

The default serial interface settings are shown in the following table.

Table 2 Default Serial Interface Settings

Property Description/Value

Bit rate 19200

Parity None

Data bits 8

Stop bit 1

Flow control None

For more detailed instructions on connecting to GMP251/GMP252 with a computer and

using the serial line interface, see the User Guides of the probes.

1.3 Conﬁguring Relays with Serial Line

To enable relay control with the current output channel and set the relay conﬁguration,

follow the instructions below for the relevant software version.

More Information

‣Conﬁguring Relays with GMP250 Software Version 1.3.1 or Later (page 5)

‣Conﬁguring Relays with GMP250 Software Version 1.2.9 (page 7)

Relay Box for GMP250 Carbon Dioxide Probes Quick Guide M211920EN-C

1.3.1 Conﬁguring Relays with GMP250 Software Version 1.3.1 or

Later

Use the rsel command (not the asel command) to set the analog output channel to

current (mA).

1. Connect GMP251/GMP252 to a computer with USB service cable 242659 and open a

terminal connection (for example, PuTTy).

2. Enable advanced conﬁguration commands with the pass 1300 command.

3. Set the serial mode of the analog current output channel (2) to relay control with the

following command: smode relay2

Chapter 1 – Relay Box Quick Guide

4. Conﬁgure the current output channel's relay settings with the rsel command:

rsel [channel parameter release_ppm set_ppm release_value set_value

startup_value error_value]

•channel= analog output channel: set to 2(current)

•parameter = the parameter that controls the relay: set to co2

•release_ppm = CO2ppm level at which the relay is released

•set_ppm = CO2ppm level at which the relay is activated

•release_value = the current output (mA) when the relay is released

•set_value = the current output (mA) when the relay is activated: set to 12

•startup_value = during probe start-up, if the CO2ppm level falls between the

release_ppm and set_ppm values, startup_value shows the state of the relay

(mA): the relay is either activated, released, or in error state.

•error_value = the current output when the probe is in error state

The relay mode of GMP251 and GMP252 probes has been designed to use 12 mA as

the relay control current. Use only 12 mA for the set_value conﬁguration when

using the relay box with GMP251 and GMP252.

Example:

Set the analog output channel 2 (current) to control relay operation with the following

settings:

• The relay is activated when the measurement is over 10100 ppm CO2and released

when under 9900 ppm CO2. Setting these relay activation limits means using a

1 % CO2(10 000 ppm CO2) relay setpoint with a hysteresis of ±1 % (100 ppm CO2).

• The output current is 0 mA when the relay is released.

• The output current is 12 mA when the relay is activated.

• The output current is 12 mA if during probe start-up CO2ppm level is between 9900

and 10100 ppm.

• The output current is 0 mA when the probe is in error state.

Enter the following commands:

pass 1300

smode relay2

rsel 2 co2 9900 10100 0 12 12 0

Relay Box for GMP250 Carbon Dioxide Probes Quick Guide M211920EN-C

1.3.2 Conﬁguring Relays with GMP250 Software Version 1.2.9

Use the rsel command (not the asel command) to set the analog output channel to

current (mA).

1. Connect GMP251/GMP252 to a computer with USB service cable 242659 and open a

terminal connection (for example, PuTTy).

2. Enable advanced conﬁguration commands with the pass 1300 command.

3. Set the serial mode of the analog current output channel (2) to relay control with the

following command: smode relay2

4. Conﬁgure the current output channel's relay settings with the rsel command:

rsel [channel parameter release_ppm set_ppm set_value error_value]

•channel= analog output channel: set to 2(current)

•parameter = the parameter that controls the relay: set to co2

•release_ppm = CO2ppm level at which the relay is released

•set_ppm = CO2ppm level at which the relay is activated

•set_value = the current output (mA) when the relay is activated: set to 12

•error_value = the current output when the probe is in error state

The relay mode of GMP251 and GMP252 probes has been designed to use 12 mA as

the relay control current. Use only 12 mA for the set_value conﬁguration when

using the relay box with GMP251 and GMP252.

Example:

Set the analog output channel 2 (current) to control relay operation with the following

settings:

• The relay is activated when the measurement is over 10100 ppm CO2and released

when under 9900 ppm CO2. Setting these relay activation limits means using a

1 % CO2(10 000 ppm CO2) relay setpoint with a hysteresis of ±1 % (100 ppm CO2).

• The output current is 12 mA when the relay is activated.

• The output current is 0 mA when the probe is in error state.

Enter the following commands:

pass 1300

smode relay2

rsel 2 co2 9900 10100 12 0

Chapter 1 – Relay Box Quick Guide

1.3.3 Serial Line Mode Commands

Only serial mode commands related to relay operation are presented here. For other serial

mode conﬁguration options, see the User Guides of the GMP251/252 probes.

Table 3 Smode Command

Syntax Description

smode<cr> Shows the current start-up operating mode of the

serial line.

smode [mode]<cr> Set serial line start-up operating mode. The new mode

is taken into use when the device is reset or powered

up. Note: only use the RELAY2 option.

Available modes:

RELAY1 = Voltage output channel: do not use for relay

control with the GMP250 relay box.

RELAY2 = Set analog output channel 2 (current) to

relay control: use only this option with the relay box.

Example (set serial mode to "RELAY2" (channel 2 current output)):

smode RELAY2

Serial mode : RELAY2

1.3.4 Relay Conﬁguration Commands

Table 4 Rsel Command for GMP250 Software Version 1.3.1 or Later

Syntax Description

rsel [channel]<cr> Show current relay settings.

channel = Analog output channel

Relay Box for GMP250 Carbon Dioxide Probes Quick Guide M211920EN-C

Syntax Description

rsel [channel parameter release_ppm

set_ppm release_value set_value

startup_value error_value]<cr>

Conﬁgure relay operation of the channel.

channel = Analog output channel

• 1 = voltage output (V): not used with relay

•2= current output (mA): only use this option with

the relay box.

parameter = The parameter that is output on analog

channel. The only option is CO2 (in ppm).

release_ppm = CO2level at which the relay is

released.

set_ppm = CO2level at which the relay is activated.

release_value = The current output (mA) when

the relay is released.

set_value = Current (mA) output when the relay is

activated. Set to 12 when using the relay box with

GMP251/252.

startup_value = During probe start-up, if the CO2

ppm level falls between the release_ppm and

set_ppm values, startup_value shows the state

of the relay (mA): the relay is either activated,

released, or in error state.

error_value = The current (mA) that is output

when the probe is in an error state.

Table 5 Rsel Command for GMP250 Software Version 1.2.9

Syntax Description

rsel [channel]<cr> Show current relay settings.

channel = Analog output channel

rsel [channel parameter release_ppm

set_ppm set_value error_value]<cr>

Conﬁgure relay operation of the channel.

channel = Analog output channel

• 1 = voltage output (V): not used with relay

•2= current output (mA): only use this option with

the relay box.

parameter = The parameter that is output on analog

channel. The only option is CO2 (in ppm).

release_ppm = CO2level at which the relay is

released.

set_ppm = CO2level at which the relay is activated.

set_value = Current (mA) output when the relay is

activated. Set to 12 when using the relay box with

GMP251/252.

error_value = The current (mA) that is output

when the probe is in an error state.

Chapter 1 – Relay Box Quick Guide

The relay mode of GMP251 and GMP252 probes has been designed to use 12 mA as the

relay control current. Use only 12 mA for the set_value conﬁguration when using the

relay box with GMP251 and GMP252.

1.4 Probe and Relay Box Wiring

Function Wire Color

Output control

Voltage output

Current output

GND

Power in

Gray

White

Black

Blue

Brown

GMP25X Probe

Voltage

Current

GND

Power Power

GND

Vout

GND

Relay

Inputs / Outputs

Relay Box Input/Output

GND

Power supply to GMP25x

Voltage output from GMP25x *

GND

Relay contact

Power supply to GMP25x:

20 ... 30 VDC (for current output)

*) Voltage output from GMP25x is internally connected to Vout

Figure 1 Probe and Relay Box Wiring

1. Open the relay box screws and remove the cover.

2. Lead the GMP251/252 probe connection cable with open wires (223263SP/244669SP/

216546SP) through the left cable gland and connect the open wires to the screw

terminals as shown in Figure 1 (page 10).

3. Lead the relay box input/output cable through the right cable gland and connect the

wiring as shown in Figure 1 (page 10).

Do not switch on the power supply before you have completed the

wiring and reattached the relay box cover.

CAUTION!

4. After the wiring is complete, reattach the relay box cover and switch on the 20 ... 30

VDC power supply.

Relay Box for GMP250 Carbon Dioxide Probes Quick Guide M211920EN-C

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