Serial Line Mode Commands - GMP251 - GMP252

Relay Box for GMP250 Carbon Dioxide Probes Quick Guide

Document code
English (United States)
Document type
User guide
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 1. 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