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
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