Serial Port Configuration
Original instructions
About us
Introduction
To configure the module in serial mode, select Setup → Serial Port → Parameters.
NOTE: To configure a modem in serial link (serial mode or PPP), it is mandatory to configure the serial port.
Serial Configuration
Parameter
Value scope
Default value
Description
Physical Line
RS232/RS485
RS232
selects physical connection lines
Signals
  • Rx-Tx
  • Rx-Tx+RTS-CTS
  • Rx-Tx+RTS-CTS-DCE
Rx-Tx
selects signal lines for communication
Delay Before Transmission (T1)
0...65535 (as the unit is 10 ms, the range is 0...655.35 s)
0
only used with DCE flow control algorithm; transmission delay after RTS is set
Delay After Transmission (T2)
0...65535 (as the unit is 10 ms, the range is 0...655.35 s)
0
only used with DCE flow control algorithm; time to reset RTS after transmission end
Delay Between Transmissions (T3)
0...65535 (as the unit is 10 ms, the range is 0...655.35 s)
0
only used with DCE flow control algorithm; min. time between RTS reset and next RTS set (the delay depends on the application)
Baud Rate
300/600/1200/2400/4800/9600/19200/38400
19200
transmission speed of the serial port, bits per second
Data Bits
8
8
bits for data in one transmission unit
Stop Bits
1/2
1
bits to stop in one transmission unit
Parity
None/Odd/Even
None
parity mode
This chronogram shows the settable delays:
Modem Configuration
Select Communication → Modem → Parameters:
Parameter
Value scope
Default value
Description
Modem Type
None / Radio / PSTN / GSM / GPRS
None
selects Modem type
Connection Type
Permanent/ On Demand
On Demand
  • Permanent: connect modem automatically when module is power up
  • On Demand: connect or disconnect modem according to CMD Reg in CPU
Default Phone Index
1...64
1
phone index in phone list: used when connection mode is permanent, or value in CPU phone index register is invalid
Max Retry
0...255
3
indicates the maximum number of retries to establish a connection.
Command Reg Address (%MW)
0...32464
0
start %MW address of 4 CPU modem registers which represent modem command and status for modem serial link. Or start address of 8 %MW registers, which represent modem command, status, local and remote IP address for modem PPP link.
PPP Enable
check box
checked
if enabled, PPP protocol is used for the modem connection
NOTE: When using RTU protocol (IEC 104/DNP3) via PSTN/GPRS or ADSL mode, the gateway IP address is replaced after connection is established. So it is not possible to route through Ethernet when the module is connected to the GPRS/PPPoE network.
GSM
Condition: GSM has been selected in the Modem screen.
Select Communication → Modem → Modem GSM:
Parameter
Value scope
Default value
Description
Init AT CMD
—
ATE0Q0S0=1&D0&S0&C0
custom AT commands specified by user - AT commands to initialize modem, which is an AT command string starting with AT
PIN Code
4-8 number
0000
PIN code for the SIM card
SMS Service Center
—
-
number of the service center for the SMS server - International format number of the service center for the SMS server, set symbol (-) if not specify it
SMS Type
PDU_7bits/ PDU_8bits
PDU_7bits
PDU_7bits: the message is encoded on 7 bits, and it is used to send text message composed of ASCII characters. It is supported in most of mobile phones.
PDU_8bits: the message is encoded as 8 bits, and it is used to send data message. It depends on the brand of mobile phone, not all mobile phones support it.
GPRS
Condition: GPRS has been selected in the Modem screen.
Select Communication → Modem → Modem GPRS:
Parameter
Value scope
Default value
Description
Init AT Command
—
ATE0Q0S0=1&D0&S0&C0
custom AT commands specified by user - AT commands to initialize modem, which is an AT command string starting with AT
Access Point Name (APN)
—
-
name of the access point given by the service provider for GPRS
PIN Code
4 digits at least
0000
PIN code for the SIM card
SMS Service Center
—
-
number of the service center for the SMS server - International format number of the service center for the SMS server, set symbol (-) if not specify it
SMS Type
PDU_7bits/ PDU_8bits
PDU_7bits
PDU_7bits: the message is encoded on 7 bits, and it is used to send text message composed of ASCII characters. It is supported in most of mobile phones.
PDU_8bits: the message is encoded as 8 bits, and it is used to send data message. It depends on the brand of mobile phone, not all mobile phones support it.
Username
—
USER
username of the APN given by the service provider
Password
—
USER
password of the APN given by the service provider, set symbol (-) if not specifying it
Local IP address
—
0.0.0.0
Local IP address for PPP client, and IP address is served by server if specifying 0.0.0.0.
PSTN
Condition: PSTN has been selected in the Modem screen.
Select Communication → Modem → Modem PSTN:
Parameter
Value scope
Default value
Description
Init AT CMD
—
ATE0Q0S0=1&D0&S0&C0
custom AT commands specified by user - AT commands to initialize modem, which is an AT command string starting with AT
PPP Server
Conditions: in the Modem screen, the modem type GSM or PSTN has been selected and the box PPP Enable has been checked.
Select Communication → Modem → PPP Server:
Parameter
Value scope
Default value
Description
Username for Server
—
USER
username of the remote device (only used for modem PPP as server mode)
Password for Server
—
USERUSER
password of the remote device (only used for modem PPP as server mode)
Local IP Address
—
0.0.0.0
IP address of the remote device
Allow Remote IP Address
check box
unchecked
whether allow calling device to specify its own IP address
Phone List
Select Communication → Modem → Phone List:
Parameter
Value scope
Default value
Description
Phone Index
1...64
1
phone number index of the remote device
Phone Number
—
000000
phone number of the remote device
Local IP
—
0.0.0.0
IP address of the local device and IP address is served by provider if specifying 0.0.0.0. (only used for modem PPP as server mode)
Username
—
USER
username of the remote device (only used for modem PPP as server mode)
Password
—
USERUSER
password of the remote device (only used for modem PPP as server mode)
Comment
—
Comment
comments from the user