Relay Configuration Commands - GMP251 - GMP252

Relay Box for GMP250 Carbon Dioxide Probes Quick Guide

Document code: M211920EN
Revision: C
Language: English
Product: GMP251; GMP252
Document type: User guide

Table 1. Rsel Command for GMP250 Software Version 1.3.1 or Later
Syntax	Description
rsel [channel]<cr>	Show current relay settings. channel = Analog output channel
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 = CO₂ level at which the relay is released. set_ppm = CO₂ level 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 2. 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 = CO₂ level at which the relay is released. set_ppm = CO₂ level 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.

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.