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TeleBoss 850 2.06.280_STD User Manual
Page 89
PPP over Serial Port
This feature enables you to network the unit with a another unit, a windows PC, or a linux PC, via the unit's I/O 2 serial
port. There are two ways to operate this feature: use the unit as a host or as a client. Where the unit is the host/client,
configure the other machine (the PPP peer) to be client/host. The unit imposes no inactivity timeout.
This may be desirable in situations where you need networked connectivity but you can't dedicate an Ethernet
connection. Combined with PPP routing, you can use a pair of units and an RS232 cable to extend IP connectivity to a
location where Ethernet connectivity is not available.
Configuration
PPP over Serial Port may be configured with the T850 set for Host Mode or Client Mode:
Host Mode
1. Connect the unit to the other machine via RS232.
2. Select the addressing to use. This is done with the PPP Hosting Local and Remote IP Address settings
(
net.ppphost.localip
,
net.ppphost.remoteip
).
3. Select the baud rate to use (it should match the baud rate configured for the other machine). This is done with
the I/O 2 Baud Rate setting (
serial[2].baud
). Typically you want to use the maximum (115200), but this
ultimately depends on the condition of the serial connection. The serial parametes used are always 8N1.
4. On the unit, set the I/O 2 mode to PPP HOST. (
sk serial[2].mode
=PPP HOST
)
5. On the other machine, configure a client PPP connection. If the other machine is windows, use the Control
Panel -> Network Connections -> New Connection Wizard. Select Advanced connection -> Connect directly
to another computer -> Guest -> Computer name (pick anything) -> Select a device (pick a serial port) ->
Finish. Then when you start this connection, use login credentials for a user on the unit. If the other machine
is another unit, see the next section for how to configure PPP CLIENT mode on the unit.
6. When the other machine is finished making the connection, you can verify the addressing on the unit by
entering the PPP command on the unit.
The connection stays up as long as the units are physically connected regardless of PPP activity; the unit does not
time-out the connection (unlike with a dial-up PPP connection). If the connection is broken then the unit goes into a
state of waiting for a connection again.
To bring down the connection there are two options:
1. Change the I/O 2 mode to something other than PPP HOST.
2. Enter the
PPP DOWN
command. (Note that in doing this, if the machines are still physically connected, the
connection may be brought up again, since the PPP peer may be in a mode where it immediately restarts the
connection if it disconnects. This is true if the other machine is another unit.)
Note that by default, the unit firewalls its PPP connection. So if you try to talk to the unit from the other machine over
the PPP connection, you will have to disable the firewall on the unit by entering
sk net.firewall.ppp
=off
.
Client Mode
1. Connect the unit to the other machine via RS232.
2. On the unit, configure the credentials used to log in to the other machine. This is done with the PPP Dialout
Username and Password settings (
net.pppdial.username
,
net.pppdial.password
).
3. Select the baud rate to use (it should match the baud rate configured for the other machine). This is done with
the I/O 2 Baud Rate setting (
serial[2].baud
). The serial parametes used are always 8N1.
4. On the unit, set the I/O 2 mode to PPP CLIENT. (
sk serial[2].mode
=PPP CLIENT
)
Summary of Contents for Teleboss 850
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