Installing the Hardware
9
Connecting Devices to the iNS
The iNS serial ports may each be independently configured via software, to operate in RS-
232, RS-422 or RS-485 mode. The following sections describe the pinouts and cabling
options associated with these different modes.
iNS/3000 RS-232 Operation
The iNS/3000 port server family uses an EIA-232 data terminal equipment (DTE) pinout on
the serial ports. Table 2-1 lists the pinouts of the DB-9 and screw terminal ports used for EIA-
232 serial communications.
Pin
Number
RS-232
Name
Direction
Signal Function
1
DCD
I
Signals module that remote device has a valid
connection
2
RX
I
Serial data in, from remote device to iNS
3
TX
O
Serial data out, from iNS to remote device
4
DTR
O
Signals remote device that iNS is attached and
powered on
5
GND
Signal ground
6
DSR
I
Signals module that remote device is attached and
powered on
7
RTS
O
Flow control, to enable remote device to send data
8
CTS
I
Flow control, to enable iNS to send data on TX
9
RI
I
Ring Indicator (except on screw terminal connector)
Table 2-1: EIA-232 Pinouts
The screw terminal connectors for each port bring out the same signals as the DB-9
connectors with the exception of the RI signal that is only present on the DB-9. The screw
terminal pins are numbered left-to-right, 1 through 8.
