User's Manual

General Document, Register Cobra module on CMU200
Author: Version:
V01
–
F1
Creation Date:
Jul 31, 2006
Page:
5 of 6
Option Confidential:
This document is Option Confidential - it may not be duplicated, neither distributed externally without prior and written permission of
Option NV.
At_opbm = “PCS”,1 (selection of PCS band)
At_opbm = “DCS”,0 (deselection of DCS band)
Same for the other bands, also the UMTS bands!!!
To check if the band is really (de)selected, use “at_opbm?” The bands showing 0 are deselected,
the bands showing 1 are selected.
2. AT_OPSYS
When the band settings did not work, try the OPSYS command: this command selects the
UTRAN and the packet and/or circuit switched domain.
Extract from datasheet:
Preferred SYStem “AT_OPSYS”
Command Possible Response(s)
_OPSYS=[<mode>[,<domain>]] OK
_OPSYS? _OPSYS: <mode>,<domain>
_OPSYS=? _OPSYS: (0-5),(0-6)
Description
This command changes the preferred system, GSM/WCDMA, the acquisition order and the service
domain preference PS/CS.
Defined values
<mode>:
0
GSM only
1 WDMA only
2 GSM first
3 WCDMA first
4 No change
5 Auto
<domain>:
0
Acquire only circuit-switched systems
1 Acquire only packet-switched systems
2 Acquire circuit-and/or packet-switched systems
3 Any domain will do; no preference
Eg: at_opsys=0,2 selects options:
GSM only and CS & PS domains