Enterasys csx5500 用户指南
USER’S GUIDE
66 CyberSWITCH
H
ARDWARE
C
HARACTERISTICS
Number of Ports:
4 (using RS232 adapter cable)
Connectors:
DB26
Interface:
RS232 DTE/DCE (using RS232 adapter cable)
MTBF:
75000hours
MTTR:
0.25hour
RS232 C
ONNECTION
The RS232 interface is provided by an adapter cable which converts the DB26 connection on a
RS232 adapter to two standard 25-pin RS232 connections.
RS232 adapter to two standard 25-pin RS232 connections.
Each port on a RS232 adapter has software configurable for DTE (external clocking) or DCE
(internal clocking). Be sure to use the appropriate RS232 adapter cable (DTE or DCE).
(internal clocking). Be sure to use the appropriate RS232 adapter cable (DTE or DCE).
The DTE RS232 adapter cable provides two standard 25-pin connections with male contacts. The
DCE RS232 adapter cable provides two standard 25-pin connections with female contacts. The
following table shows the pin and signal assignments for the RS232 interfaces provided by the
adapter cable.
DCE RS232 adapter cable provides two standard 25-pin connections with female contacts. The
following table shows the pin and signal assignments for the RS232 interfaces provided by the
adapter cable.
Pin and Signal Assignments for the RS232 Connection
RS232 Pin
Signal
Function
RS232 Pin
Signal
Function
1
Chass
Chassis Ground
14
NC
No Connect
2
TD
Transmit Data
15
TXC
Transmit Clock
3
RD
Receive Data
16
NC
No Connect
4
RTS
Request to Send
17
RXC
Receive Clock
5
CTS
Clear to Send
18
NC
No Connect
6
DSR
Data Set Ready
19
NC
No Connect
7
Gnd
Signal Return
20
DTR
Data Terminal Ready
8
NC
No Connect
21
NC
No Connect
9
NC
No Connect
22
RI
Ring Indicator
10
NC
No Connect
23
NC
No Connect
11
NC
No Connect
24
NC
No Connect
12
NC
No Connect
25
NC
No Connect
13
NC
No Connect