External serial port (“console”) – USRobotics NETServer/8 User Manual
Page 219
Technical Specifications A-3
External Serial Port (“Console”)
8-Position
Circuit
Function
Direction
Modular Jack
1
CC
Data Set Ready
Inbound
2
CF
Carrier Detect
Inbound
3
CD
Data Terminal Ready
Outbound
4
AB
Signal Ground
5
BB
Receive Data
Inbound
6
BA
Transmit Data
Outbound
7
CB
Clear to Send
Inbound
8
CA
Request to Send
Outbound
Electrical specification:
Connectors:
RS-232, 8-position modular jack
8-position modular jack: Stewart 88-360808 or equivalent
DB-25:
Amp 748677-1 or equivalent
Configuration:
DTE
Transmission method:
Unbalanced RS-232
Transmission rate:
57.6 Kbps maximum
Serial Port Cable (DCE) Specifications
8-Position
DB-25M
Using Adapter*
Function at NIC
Modular Jack
(DB-25F)
6
2
3
Transmit Data
5
3
2
Receive Data
8
4
5
Request to Send
7
5
4
Clear to Send
1
6
20
Data Set Ready
4
7
7
Signal Ground
2
8
20
Carrier Detect
3
20
6, 8
Data Terminal Ready
N/C
−
N/C
Ring Indicate
N/C indicates Not Connected
*
DB-25-to-DB-25 null modem adapter
Wire type:
Belden 9538 or equivalent, 8
conductor, shielded
Maximum cable distance:
50 feet, 15 meters
Cabling:
8-position modular jack to DB-25
(IBM AT pin-out)