Multi-Tech Systems GPRS (MTSMC-G) ユーザーズマニュアル

Chapter 13 – Specific AT Commands  

Multi-Tech Systems, Inc. Wireless GSM/GPRS AT Commands (Document Number S000293I) 

115 

Description: 

This command sets the default GPIO’s configuration (input or output) after reset, and each GPIO default 
value (if set as an output) after reset. 

• 

This command is allowed only on a GPIO not allocated by the Open-AT embedded application or 
for  bus operations. 

• 

When UART is activated, GPIOs 0 and 5, GPO2 and GPI are not available anymore. When you 
try to do writable or readable operations on these I/O, CME ERROR: 3 will be returned. This 
applies for modems running AT X50 software and supporting the multi-UART feature. 

• 

When the BT chip is switched on, the GPIO5 is not available anymore. It is not possible to 

change the state of the GPIO using this command. 

Values: 

<GpioDir>   Bit table parameter indicating each GPIO direction.  

0 Input 
1 

Output. Default. 

Default value: 2047 (all GPIOs set as outputs).  

<GpioVal>  Bit table parameter indicating each output-configured GPIO value (each bit gives the 

corresponding GPIO default value). 
0 

 Reset. Default. 

1  Set 
The GPIOs set as inputs by the <GpioDir> parameter are not affected by the value set by the 
<GpioVal> parameter. 

• 

<GpioDir> bit values for GPI and GPO are ignored.  

• 

<GpioVal> bit values for GPI are ignored. 

AT+WIOM=[<GpioDir>],[<GpioVal>]

AT+WIOM? +WIOM: 

2047,0 

OK 
On reset, all GPIOs are set to 0, as an output 

AT+WIOM=? +WIOM: 

(0-2047),(0-2047) 

OK 
Range allowed for the parameters. 

AT+WIOM=254 
Set GPIO 0 as an input, and all others as outputs 

OK 

AT+WIOM=,128 
Set GPIO 3; default output value to 1 

OK 

AT+WIOM=,128 
Note: Set GPIO 8 or GPIO12 or GPIO7; default 
output value to 1 

OK