(408) 744-9040
(408) 744-9040
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SIM900 Series Tech Support

If you are experiencing trouble with your SIM900 you can either send your instrument back to SRS for service, or you can try and fix the problem yourself. If you wish to send the instrument back now click here.

If you wish to try and fix the problem yourself, the following troubleshooting guide may help you.

Troubleshooting Guide

Symptom 1 — Can't send commands remotely over GPIB or RS-232 interfaces

Click here to download programming examples for the SIM900 Series.

Upgrade to GPIB — Installing the GPIB interface (opt. 01) in the field

Click here to download the installation procedure. You will need to call SRS at 408-744-9040 or email us at to place your order for the GPIB interface.

SIM928 — Installing the replacement battery assembly (O928RBA) in the field

Click here to download the installation procedure.

You can order the replacement battery assembly by clicking here.


If you are still having trouble your SIM900 Series Instrumentation, it will need to come back to SRS for service. Click here to get an RMA number.

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