TN103 - RS-232 Cables
| 103.1 | General |
| 103.4 | EIA RS-232-C, Summary of Standard |
| 103.5 | RS-232 on DB9, (IBM PC AT de facto standard) |
| 103.6 | RS-232 on RJ-45, EIA-561 |
| 103.7 | Cisco 2511 Terminal Server Pinout |
| 103.8 | Sun Netra T1 Pinout |
| 103.9 | Cisco 7500 Series Router and 5000 Series Switches Pinout |
| 103.10 | Sun Server Pinout |
| 103.11 | Cisco 2511 Octopus Cables |
| 103.12 | Cisco Console Cables |
103.1 General
RS-232 serial connections are still frequently used to configure
switches, routers, and attache consoles to some systems.
102.2 References
More detailed information can be found at:
http://www.psyber.com/~tcj/tcserial.html
http://www.uwsg.indiana.edu/usail/peripherals/serial/rs232/
http://www.cs.cmu.edu/~vaschelp/Misc/Serial/serial.txt
http://www.arcelect.com/rs232.htm
102.3 Tools
Recommended breakout box: GN Nettest, Datacheck 7
http://www.jensentools.com/
part number 875-515
Serial Protocol Analyzer
http://www.hhdsoftware.com/sermon.html
DB9 to DB25 adapters, gender changers, null modem adapters
http://www.l-com.com/
Slimline DB9 null modem Part no. DMA060MF
Slimline DB25 null modem Part no. DMA071MF
Slimline DB9M to DB25F Part no. DMA010MF
Slimline DB9F to DB25M Part no. DMA010FM
Slimline DB9 M/M Part no. DGBM
Slimline DB9 F/F Part no. DBBF
Slimline DB25 M/M Part no. DGB25M
Slimline DB25 F/F Part no. DGB25F
103.4 EIA RS-232-C, Summary of Standard
Voltages: +3 to +25, On, Binary 0, or Space
-3 to -25, Off, Binary 1, or Mark
-3 to +3, undefined
Pins:
Pin Name DTE DCE Function EIA Circuit
--- ---- --- --- ------------------------- -----------
1 FG Frame Ground (AA)
2 Txd Out In Transmitted Data (BA)
3 Rxd In Out Received Data (BB)
4 RTS Out In Request to Send (CA)
5 CTS In Out Clear To Send (CB)
6 DSR In Out Data Set Ready (CC)
7 SG Signal Ground (AB)
8 DCD In Out Data Carrier Detect (CF)
9 In Out Positive DC test voltage
10 In Out Negative DC test voltage
11 Unassigned
12 (s)DCD In Out Sec. Data Carrier Detect (SCF)
13 (s)CTS In Out Sec. Clear To Send (SCB)
14 (s)Txd Out In Sec. Transmitted Data (SBA)
15 TC In Out Transmitter Clock (DB)
16 (s)Rxd In Out Sec. Received Data (SBB)
17 RC In Out Receiver Clock (DD)
18 Out In Receiver Dibit Clock
19 (s)RTS Out In Sec. Request To Send (SCA)
20 DTR Out In Data Terminal Ready (CD)
21 SQ In Out Signal Quality Detect (CG)
22 RI In Out Ring Indicator (CE)
23 Out In Data Rate Select (CH/CI)
24 (TC) Out In Ext. Transmitter Clock (DA)
25 Out In Busy
The standard defines two implementations, Data Terminal Equipment (DTE)
and Data Communications Equipment (DCE). It was intended that opposites
always be connected together. Generally a straight through cable is used
to connect a DTE device to DCE device. When connecting two of the same
implementations (DTE-DTE or DCE-DCE) then a cross-over cable must be
used so that inputs are always connected to a corresponding output.
With RS-232 this is typically called a null-modem cable.
103.5 RS-232 on DB9, (IBM PC AT de facto standard)
DTE, DB 9, male
1 DCD to PC
2 Rxd to PC
3 Txd from PC
4 DTR from PC
5 SG
6 DSR to PC
7 RTS from PC
8 CTS to PC
9 RI to PC
103.6 RS-232 on RJ-45, EIA-561
Although not widely used, EIA defined a standard (EIA-561) for non-
synchronous applications on the an 8 pin modular connector (sometimes
called an RJ-45 connector)
Plug Jack
(Looking at connector (Looking at cavity
end with the cable in the wall)
running away from you)
---------- / ----------
| 87654321 | | 12345678 |
|__ __|/ |/_ /_|
|____| |/___|
Pin Name DTE DCE
--- ---- --- ---
1 RI In Out
2 DCD In Out
3 DTR Out In
4 SG
5 Rxd In Out
6 Txd Out In
7 CTS In Out
8 RTS Out In
Back view of RJ45 jack in the shell of DB (9 or 25) connector.
Pin no. shown on top wire color shown in position
8 7 6 5 4 3 2 1
+-------------------------+
| |
| Wh Yl Rd Or |
| |
| Bn Gn Bk Bu |
| |
+-------------------------+
103.7 Cisco 2511 Terminal Server Pinout
DTE Async serial ports, via RJ-45 plug on the octopus cable,
1 CTS to 2511
2 DSR/DCD to 2511
3 Rxd to 2511
4 Rxd/Gnd ---
5 Txd/Gnd ---
6 Txd from 2511
7 DTR from 2511
8 RTS from 2511
DTE Console and auxiliary ports on 2511, Async serial ports on 2511RJ
via the RJ-45 jack on back of equipment,
1 RTS from 2511 (Not used on console)
2 DTR from 2511
3 Txd from 2511
4 Gnd ---
5 Gnd ---
6 Rxd to 2511
7 DSR to 2511
8 CTS to 2511 (Not used on console)
103.8 Sun Netra T1 Pinout
DTE Async serial ports, via RJ-45 jack on back of equipment
1 RTS from Sun
2 DTR from Sun
3 Txd from Sun
4 Gnd ---
5 Gnd ---
6 Rxd to Sun
7 DSR to Sun
8 CTS to Sun
103.9 Cisco 7500 Series Router and 5000 Series Switches Pinout
Console
DCE, DB-25, female
1 Frame Gnd
2 Txd to Cisco
3 Rxd from Cisco
4 RTS to Cisco *
5 CTS from Cisco *
6 DSR from Cisco
7 Gnd
8 DCD from Cisco
20 DTR to Cisco *
* 7500 series does not use these pins and hardware flow control
is not supported.
Auxiliary Port
DTE, DB-25, male
2 Txd from Cisco
3 Rxd to Cisco
4 RTS from Cisco
5 CTS to Cisco
6 DSR to Cisco
7 Gnd
8 DCD to Cisco
20 DTR from Cisco
103.10 Sun Server Pinout
Sun Servers with DB 25 connectors
DTE
2 Txd from sun
3 Rxd to sun
4 RTS from sun
5 CTS to sun
6 DSR to sun
7 Gnd
8 DCD to sun
15 DB from sun
17 DD in sun
20 DTR from sun
22 RI in sun
24 DA from sun
103.11 Cisco 2511 Octopus Cables
a. Octopus RJ45 to DB-25, for connection to Sun ttya
RJ-45 RJ-45 DB-25
pin color pin
1 Bu 4
2 Or 20
3 Bk 2
4 Rd 7
5 Gn nc
6 Yl 3
7 Bn 6
8 Wh 5
Back view of male DB25
pin no. shown on top and bottom
wire color shown in position
13 12 11 10 9 8 7 6 5 4 3 2 1
+---------------------------------------+
| Rd Bn Wh Bu Yl Bk |
| |
| Or |
+---------------------------------+
25 24 23 22 21 20 19 18 17 16 15 14
b. Octopus RJ45 to DB-25, for connection Cisco 7507 console
RJ-45 RJ-45 DB-25
pin color pin
1 Bu 6
2 Or 8
3 Bk 3
4 Rd 7
5 Gn nc
6 Yl 2
7 Bn nc
8 Wh nc
Back view of male DB25
pin no. shown on top and bottom
wire color shown in position
13 12 11 10 9 8 7 6 5 4 3 2 1
+---------------------------------------+
| Or Rd Bu Bk Yl |
| |
| |
+---------------------------------+
25 24 23 22 21 20 19 18 17 16 15 14
c. Octopus RJ45 to DB-25, for connection Cisco 5000 console
RJ-45 RJ-45 DB-25
pin color pin
1 Bu 5
2 Or 8
3 Bk 3
4 Rd 7
5 Gn nc
6 Yl 2
7 Bn nc
8 Wh 4
Back view of male DB25
pin no. shown on top and bottom
wire color shown in position
13 12 11 10 9 8 7 6 5 4 3 2 1
+---------------------------------------+
| Or Rd Bu Wh Bk Yl |
| |
| |
+---------------------------------+
25 24 23 22 21 20 19 18 17 16 15 14
103.12 Cisco Console Cables
a. 2511 Console RJ45 to DB-25, for connection to Wyse 185/es
or Wyse 520, Using straight through RJ-45 patch cord.
RJ-45 RJ-45 DB-25
pin color pin
1 Bu 5 CTS to Wyse
2 Or 6 DSR to Wyse
3 Bk 3 Rxd to Wyse
4 Rd 7 Gnd
5 Gn nc
6 Yl 2 Txd from Wyse
7 Bn 20 DTR from Wyse
8 Wh 4 RTS from Wyse
Back view of female DB25
pin no. shown on top and bottom
wire color shown in position
1 2 3 4 5 6 7 8 9 10 11 12 13
+---------------------------------------+
| Yl Bk Wh Bu Or Rd |
| |
| Br |
+---------------------------------+
14 15 16 17 18 19 20 21 22 23 24 25
b. 2511 Console RJ45 to DB-25, for connection to Wyse 30
Using straight through RJ-45 patch cord.
RJ-45 RJ-45 DB-25
pin color pin
1 Bu 5 CTS to Wyse
2 Or 6 DSR to Wyse
3 Bk 3 Rxd to Wyse
4 Rd 7 Gnd
5 Gn nc
6 Yl 2 Txd from Wyse
7 Bn 20 DTR from Wyse
8 Wh 4 RTS from Wyse
Back view of male DB25
pin no. shown on top and bottom
wire color shown in position
13 12 11 10 9 8 7 6 5 4 3 2 1
+---------------------------------------+
| Rd Or Bu Wh Bk Yl |
| |
| Br |
+---------------------------------+
25 24 23 22 21 20 19 18 17 16 15 14
e. Cisco RJ45 console to PC DB9, use inverted RJ45 Cable
Back view of RJ-45 to female DB9
pin no. shown on top and bottom
wire color shown in position
1 2 3 4 5
+------------------+
| Yl Bk Or RG | RG= Rd and Gn
| |
| Bn Bu Wh |
+------------+
6 7 8 9
f. Cisco DB25 console to PC DB9, use inverted RJ45 Cable and
above RJ-45 to PC DB9 (or Terminal DB25) adapter
Back view of female DB25
pin no. shown on top and bottom
wire color shown in position
1 2 3 4 5 6 7 8 9 10 11 12 13
+---------------------------------------+
| Bk Yl Bu Wh Bn RG | RG=Rd and Gn
| |
| Or |
+---------------------------------+
14 15 16 17 18 19 20 21 22 23 24 25
g. Cisco RJ-45 console to Terminal DB25, use inverted RJ45 Cable
Back view of male DB25
pin no. shown on top and bottom
wire color shown in position
13 12 11 10 9 8 7 6 5 4 3 2 1
+---------------------------------------+
| Or RG Bu Wh Bk Yl | RG= Rd and Gn
| |
| Br |
+---------------------------------+
25 24 23 22 21 20 19 18 17 16 15 14
|
