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4.1.7 Modem emulation mode operations
In modem emulation mode, the serial port process acts as if it is a modem attached to the serial
device. It accepts AT modem commands and answers to them, as modems would do. It also handles
the modem signals correctly. Modem emulation mode is useful in the following cases.
- There already exists a modem attached to the users’serial device.
If users’serial device already has a modem for phone-line connection, it can be just replaced by
the HelloDevice Pro Series for Ethernet connection. What users need to do is to use an IP
address (or domain name) instead of phone number as a parameter of ATA/ATDT commands.
- It is required to send serial data to the multiple remote hosts.
If the serial device should send data to the multiple hosts, modem emulation mode is required.
For example, the first data from the serial device can be sent to the first data acquisition server
and the second to the second server. What user device has to do is to change the IP address (or
domain name) parameter whenever the device sends ATD(T) XXX command.
By using the modem emulation mode of the HelloDevice Pro Series, users can have their serial device
connected to the Ethernet network easily, which is cheaper than using phone line modem. Table 4-3 is
a summarized AT command table which is supported by the HelloDevice Pro Series. Table 4-4 is a
summarized AT commands response numeric codes. Figure 4-12 shows the typical case of the serial
port command flow when ATDA command is used to connect to the Ethernet network.
Table 4-3. AT commands supported in the Pro Series
Command Internal Operation
Response
1
(Verbose Code)
+++ Return to command input mode OK
A/ Repeat last command
AT? Check status of TCP connection
If connected,
OK[CR][LF]
If disconnected,
NO CARRIER [CR][LF]
ATD(T)[remote IP]:[remote
port]
Set TCP mode as TCP client mode. And then, try to connect to
the specified remote host.
e.g. atdt192.168.1.9:1002:
Connect to IP address, 192.168.1.9, port 1002
If successful,
CONNECT [CR][LF]
If failure in connection,
NO CARRIER [CR][LF]
If other errors,
ERROR [CR][LF]
AT or ATZ Initialize TCP socket and serial port
ATA[Local port number]
Set TCP mode as TCP server mode. And then, set TCP state
as [Listen].
If successful,
OK [CR][LF]
1
If Echo mode is enabled, the command will be sent back first. And then, corresponding response will be sent. If disabled, only
response will be sent.
- HelloDevice Pro Series 1
- User Guide 1
- Copyright 2
- Trademark 2
- Notice to Users 2
- Technical Support 2
- Contents 3
- 6: System Status and Log 54 4
- 7: System administration 57 4
- 8: System tools 59 4
- Appendix A: Connections 62 4
- 1: Introduction 6
- 1.2 Package Check List 7
- 1.3 Product Specification 8
- Table 1-1 Acronym Table 10
- 2: Getting Started 11
- 2.1.2 PS200 Panel Layout 12
- 2.1.3 PS400 Panel Layout 13
- 2.2 Connecting the Hardware 15
- 2.3. Accessing Console Port 17
- 2.3.2 Using Remote console 19
- 3: IP Address Configuration 21
- 3.1.2 IP address 22
- 3.1.3 Subnet mask 22
- 3.1.4 Default gateway 22
- 3.2 DHCP 23
- 3.2.2 DHCP setting 24
- 3.3 PPPoE 25
- 3.3.2 PPPoE setting 26
- 4: Serial Port Configuration 27
- 4.1 Host mode configuration 29
- Established 32
- Sync-Recvd 32
- Sync-Sent 34
- 4.2 UART configuration 42
- 4.2.1 Type 43
- 4.2.2 Baud rate 44
- 4.2.4 Flow control 45
- 4.2.5 DTR/DSR behavior 45
- 4.4 Options 47
- 5.1.1 Configuration access 50
- 5.1.2 Serial Port access 50
- 5.2 Manual DNS configuration 51
- 5.3 Locating server 51
- 6: System Status and Log 54
- 6.2 Display log data 55
- 7: System administration 57
- 7.2 Date and time settings 58
- 8: System tools 59
- 8.3 Ping test 61
- 8.4 Socket reset 61
- 1 2 3 4 5 62
- A.3 Ethernet Wiring Diagram 63
- A.4 Serial Wiring Diagram 63
- Appendix C: Troubleshooting 66
- C.5 DHCP troubleshooting 67
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