A method used to connect a host to a host device port:
| Netdata |
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| PortMaster | (Default). When selected, the port is accessed through
a /dev/tty device on the UNIX host. For this service, the PortMaster
daemon in.pmd must be on the login host. PortMaster is the preferred
service because it allows the port to operate like a serial port installed
on the host.
For this service, the Device Name setting must match a host device name listed in the /dev directory of each UNIX host with access to the shared device. |
| Rlogin | Supported by many UNIX hosts, this service can be used to
allow hosts on the network to initiate an rlogin session to the PortMaster.
Once the session is established, a host application can directly read and
write data to the asynchronous port.
If multiple ports on the PortMaster are configured to use this service, a pool of ports that can be accessed by other hosts is automatically created. When all ports are in use, new users receive a Connection Refused message. |
| Telnet | Supported by most TCP/IP hosts, this choice allows many
different types of computers on the network to initiate a telnet session
to the PortMaster. Once the session is established, the host application
is able to directly read and write data to the serial port.
For this service, the Device Name setting must be /dev/network. The default TCP port number for telnet is 23; but you can enter an alternate TCP port if required in the text box next to the Device Service drop-down list. These ports can be pooled. Note - Move the telnet administration port to a different number
if 23 is used for network devices in this manner.
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