User Manual
Xiamen Four-Faith Communication Technology Co.,Ltd.
Page 21 of 48
Add
:
J1-J3,3
rd
Floor,No.44,GuanRiRoad,SoftWare Park,XiaMen .361008.China
http
:
//www.fourfaith.com Tel
:
+86 592-6300326 6300325 6300324 Fax
:
+86 592-5912735
aaa.bbb.ccc.ddd: the DNS server IP address
◆
Center 2~5 DNS Server
When the IP MODEM work in Multi Data Service Center method and the centers use domain
name, 2~5 DNS server is used to resolve center 2~5 correspondingly.
AT command of 2~5 DNS Server
AT+DNSSVRn=aaa.bbb.ccc.ddd
n is 1~4 correspond to center 2~5 DNS server.
aaa.bbb.ccc.ddd is the DNS server IP address
3.5.2 IP MODEM Settings
◆
IP MODEM WorkkMode
According to different application requirements, there are several protocol workmode to choose.
PROT
:
Heartbeat packet with TCP protocol, Data transmission with TCP protocol, heartbeat
packet and application data transmission are in the same TCP connection.
TRNS
:
IP MODEM work as a common GPRS MODEM, It can be used in SMS, CSD, Dial-up
applications.
TTRN
:
Heartbeat packet with UDP protocol, Data transmission with TCP protocol
TLNT
:
IP MODEM work as a telnet client
LON
G:
Heartbeat packet with UDP protocol, Data transmission with TCP protocol, It can transmit
at most 8192 bytes data one time through extra application protocol.
LNGT
:
Heartbeat with UDP protocol, Data transmission with TCP protocol, It can transmit at
most 8192 bytes data one time through extra application protocol.
TUD
P:
Heartbeat with UDP protocol, Data transmission with UDP protocol, Heartbeat packet and
application data are in the same UDP connection.
SUD
P:
User can set custom register and heartbeat string, Data transmission with UDP protocol,