Lantronix MSS100, 1-T2 manual Emulating a Direct Serial Connection, Mssb

Using the MSS Emulating a Direct Serial Connection

5.3 Emulating a Direct Serial Connection

Two MSS serial servers can be connected to emulate a direct serial connection on a LAN. Servers connected in this way can pass data only. They will not be able to pass status signals (DSR, DTS, CTS/RTS, etc.) or preserve timing between characters. The basic network conÞguration for this virtual serial line is shown in Figure 5-14.

Figure 5-14:Back-to-back MSS Connection

Serial Device

Serial Device

mss_amss_b Ethernet

192.168.5.2 192.168.5.10

Assuming the MSS serial port parameters have been conÞgured properly, they would be conÞgured as follows:

mss_a	Local>> CHANGE DEDICATED TCP
	192.168.5.10:3001T
	Local>> CHANGE AUTOSTART ENABLED
mss_b	Local>> CHANGE ACCESS REMOTE
	Local>> CHANGE DEDICATED NONE
	Local>> CHANGE AUTOSTART DISABLED

NOTE: If the two Servers are on different IP subnets, the default gateway on each unit will have to be configured with the Change Gateway command (see page 4-10).

The above commands create a raw (8-bit clean) TCP connection between the serial ports of the two Servers once the units have been power-cycled. The commands for mss_a ensure that it will automatically connect to mss_b each time it is booted. Similarly, the commands for mss_b ensure that it is always available to accept connections from mss_a.

When the UDP protocol is used, there is no connection. Each MSS must be told explicitly which hosts it is allowed to accept packets from. Broadcast or multicast IP addresses can be speciÞed to allow an MSS to send packets to all hosts on a subnet.

5 - 11