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Table Of Contents
SARA-R4 series-AT commands manual
UBX-17003787 - R16
19Internet protocol transport layer
Page 227 of 401
19.21.3Defined values
Parameter Type Description
<socket_id> Number Socket identifier; used when changing the Direct Link settings:
• SARA-R4 / SARA-N4 - The range goes from 0 to 6.
<character_trigger> Number Enhanced Direct Link character trigger, the value represents the ASCII code (in base
10) of the character to be used as character trigger. The allowed range is -1, 0-255, the
factory-programmed value is -1; -1 means trigger disabled.
19.22Direct Link disconnect DSR line handling +UDCONF=10
+UDCONF=10
Modules All products
Syntax PIN required Settings saved Can be aborted Response time Error referenceAttributes
full No No No - +CME Error
19.22.1Description
The Direct Link functionality changes the DSR line state according to the &S configuration. If the &S
configuration = 1 (default and factory programmed value), DSR line transitions will occur as follows:
• From LOW to HIGH when the module enters into Direct Link mode
• From HIGH to LOW when the module exits from Direct Link mode
The +UDCONF=10 command allows to configure the behaviour of the DSR line when the module exits from
Direct Link. In fact, the transition (from HIGH to LOW) can be configured to occur prior to or after the output
of the "<CR><LF>DISCONNECT<CR><LF>" string.
This command has no effect when the &S configuration = 0.
19.22.2Syntax
Type Syntax Response Example
Set AT+UDCONF=10,<dl_dsr_line_
behaviour>
OK AT+UDCONF=10,1
OK
Read AT+UDCONF=10 +UDCONF: 10,<dl_dsr_line_
behaviour>
OK
AT+UDCONF=10
+UDCONF: 10,1
OK
19.22.3Defined values
Parameter Type Description
<dl_dsr_line_
behaviour>
Number Behaviour of the DSR transition when the module exits from Direct Link. Allowed
values:
• 0 (default value): DSR line transition (HIGH to LOW) is performed after the output
of the "<CR><LF>DISCONNECT<CR><LF>" string
• 1: DSR line transition (HIGH to LOW) is performed before (~20 ms) the output of the
"<CR><LF>DISCONNECT<CR><LF>" string
19.23Socket control +USOCTL
+USOCTL
Modules All products
Syntax PIN required Settings saved Can be aborted Response time Error referenceAttributes
partial No No No - +CME Error
19.23.1Description
Allows interaction with the low level socket layer.