Modems - Using the SCSx00 Without Modems

Owned by Jane
Feb 10, 2020
3 min read

How do I set up two LRSs or SCSx00s to connect to each other without using a Modem?

See the SCSx00 Reference Manual for information on setting up connections without using modems. The SCSx00 Reference Manual is available from http://www.lantronix.com/support/documentation.html#cms

Cabling
=======

These example cables are for connections between two SCSx00s of the same model. If you're connecting different models see the pinout diagrams for those models in their User Guides to find out which signals are on what pins, then wire up a cable that will connect the correct signals as shown below. SCSx00 User Guides are available from http://www.lantronix.com/support/documentation.html#cms

DB25 port on the SCS100 & SCS200:

Best performance will be with a full "null modem" cable wired as below:

TX 2----------3 RX
RX 3----------2 TX
SG 7----------7 SG
CTS 4----------5 RTS
RTS 5----------4 CTS
DSR 6----------20 DTR
DTR 20----------6 DSR

It is strongly recommended that you use hardware flow control. If for some reason this is not possible simple 3-wire cable may be used with Xon/Xoff flow control or no flow control.and PPP. A 3-wire cable will not perform as well as a fully wired cable. The cable should be wired as below:

TX 2----------3 RX
RX 3----------2 TX
SG 7----------7 SG

CTS 4-| |-4 CTS
RTS 5-| |-5 RTS

DSR 6-| |-6 DSR
DTR 20-| |-20 DTR

with CTS jumpered to RTS on both ends and DSR jumpered to DTR on both ends.


DB9 port on the SCS200 & SCS400:

Best performance will be with a full "null modem" cable wired as below:

RX 2----------3 TX
TX 3----------2 RX
DTR 4----------6 DSR
SG 5----------5 SG
DSR 6----------4 DTR
RTS 7----------8 CTS
CTS 8----------7 RTS

It is strongly recommenced that you use hardware flow control. If for some reason this is not possible simple 3-wire cable may be used with Xon/Xoff flow control or no flow control.and PPP. A 3-wire cable will not perform as well as a fully wired cable. The cable should be wired as below:

RX 2----------3 TX
TX 3----------2 RX
DTR 4----------6 DSR
SG 5----------5 SG

DTR 4-| |-4 DTR
DSR 6-| |-6 DSR

RTS 7-| |-7 RTS
CTS 8-| |-8 CTS

with CTS jumpered to RTS on both ends and DSR jumpered to DTR on both ends.


RJ45 port on the SCS1600 & SCS3200:

Use a "rolled" cable:

RTS 1 1-------------8 CTS
DTR 2 2-------------7 DSR
TX+ 3 3-------------6 RX+
TX- 4 4-------------5 RX-
RX- 5 5-------------4 TX-
RX+ 6 6-------------3 TX+
DSR 7 7-------------2 DTR
CTS 8 8-------------1 RTS

Example Configurations
======================

Here are two config files for 2 sites, Irvine and Gardena, connected with the above full "null modem" cable.

Note that these configuration files assume you are going to be using hardware flow control.

# Basic setup
def server name "Irvine"
def server dhcp disa
def server bootp disa
def server rarp disa
purge ip factory
def ip ipaddress 172.50.11.21
def ip subnet 255.255.0.0
def auth local precedence 1
# Port(s) 1 setup
purge port 1
purge port 1 ppp
def port 1 access dynamic
def port 1 authenticate enabled
def port 1 pppdetect enabled
def port 1 ppp dedicated
def port 1 ppp chap both
def port 1 ppp pap disa
# Incoming/Outgoing LAN to LAN site
purge site Gardena
def site Gardena port 1
def site Gardena auth chap enabled
def site Gardena auth username "Irvine"
def site Gardena auth remote "Irvine-pw"
def site Gardena auth local "Gardena-pw"
def site Gardena idle 0
def site Gardena telephone ""
def site Gardena ip enabled
def site Gardena permanent enabled
def ip route 172.18.0.0 site Gardena 2
initialize delay 0

===============================================================

# Basic setup
def server name "Gardena"
def server dhcp disa
def server bootp disa
def server rarp disa
purge ip factory
def ip ipaddress 172.18.11.50
def ip subnet 255.255.0.0
def auth local precedence 1
# Port(s) 6 setup
purge port 6
purge port 6 ppp
def port 6 access dynamic
def port 6 authenticate enabled
def port 6 pppdetect enabled
def port 6 ppp dedicated
def port 6 ppp chap both
def port 6 ppp pap disa
# Incoming/Outgoing LAN to LAN site
purge site Irvine
def site Irvine port 6
def site Irvine auth chap enabled
def site Irvine auth username "Gardena"
def site Irvine auth remote "Gardena-pw"
def site Irvine auth local "Irvine-pw"
def site Irvine idle 0
def site Irvine telephone ""
def site Irvine ip enabled
def site Irvine permanent enabled
def ip route default next 172.18.0.1
def ip route 172.50.0.0 site Irvine 2
initialize delay 0


[Originally Published On: 07/16/1999 11:52 AM]

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