USER MANUAL, MSD-4, PT# 101012
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6
EAST COAST DATACOM, INC.
3.5
SUB
‐
CHANNEL
CONTENTION
MODES
To set the MSD-4 to operate in “RTS” or the “OR-MODE”, set as shown below for Jumpers JP11,
JP12 & JP13.
Move
the
Pin
Header
Jumpers
located on the printed circuit card.
RTS/CTS
Operation
to
Sub
‐
Channel
Contention(Hand
Shaking)
JP11, Pins 2-3
JP12, JP13 Pins 1-2
Optional: DTR & RTS Required to Switch Sub-Channels
JP15, JP16, JP17, JP18
1-2 RTS only
2-3 RTS & DTR
OR
‐
MODE
Operation
(System
doesn’t
care
about
RTS
or
DTR.
Any
port
data
gets
thru)
JP11 Pins 1-2
JP12, JP13 Pins 2-3
3.6
MASTER
PORT
OPTIONS
JP5
CTS Master Port Operation
1-2 Force
2-3 Pass (Normal)
JP6
RTS Master Port Operation
1-2 RTS to Master is forced ON
2-3 Normal RTS to Master port. Any Sub-channel port RTS gives RTS to master.
JP7
DTR Master Port Operation
1-2 DTR to Master is turned ON if any DTR from User ports is turned ON.
2-3 DTR to Master is for forced on.
3.7
SUB
‐
CHANNEL
PORT
OPTIONS
JP1, JP2, JP3, JP4
CTS Sub-Channel Control(per port control)
1
‐
6
CTS
to
user
port
follows
RTS
NOTE:
In
this
setting
If
the
attached
Terminal(DTE)
raises
RTS,
CTS
is
locally
sent
back
to
the
DTE
from
the
MSD
sub
‐
channel
port
you
are
attached
to
on
the
MSD.
2
‐
5
CTS
to
user
port
follows
RTS
from
user
port.
NOTE:
In
this
setting
2
‐
5,
RTS
from
sub
‐
channel
port
flows
thru
MSD
master
port
to
attached
modem,
then
the
modems
CTS
flows
back
thru
the
MSD
to
the
attached
Terminal(DTE)
3
‐
4
CTS
to
user
port
is
forced
ON
