Cisco VCO/4K Mechanical Assemblies page 47

Table 1: Serial Ports 1, 2 and 3 Pin and Signal Assignments
Pin
2
3
4
5
6
7
8
20
a
All pins not identified are no-connection
Master console and remote maintenance modem operating parameters (Baud Rate, Stop Bits,
Bits per Character and Parity) defined in the system database via the Peripheral
Configuration screen. Refer to the Cisco VCO/4K System Administrator's Guide for more
information.
Serial Port 1/Console
(DB-25P)
Male
Pin 2
RxD
Pin 3
Pin 7
Figure 5: I/O Module To Master Console – Cable Wiring Diagram
NOTE: You can employ a 25-conductor, straight-thru cable to connect a master
console to the Storage/Control I/O Module; however, only the conductors shown
above are used.
Signal Name Description/Direction
TxD Transmit Data
(terminal to modem)
RxD Receive Data
(modem to terminal)
RTS Request to Send
(terminal to modem)
CTS Clear to Send
(modem to terminal)
DSR Data Set Ready
(modem to terminal)
GND Chassis Ground
DCD Data Carrier Detect
(modem to terminal)
DTR Data Terminal Ready
(terminal to modem)
(3-Conductor, Straight-Thru)
GND
Description
a
VT220/320 Console
(DB-25S)
Female
TxD
Pin 2
Pin 3
Pin 7
Storage/Control I/O Module 1-7