B Peripheral Connections; Rs-232 Asynchronous: Db-25; Db-25 Pin Assignments; Db-25 Software Handshaking (Xon/Xoff) Cable - HP AD278A Support Manual

B Peripheral Connections

This appendix provides the pin-out tables to connect the communication ports to the peripheral
devices. The peripheral devices must be RS-232 compliant.This appendix addresses the following
topics:
• "RS-232 Asynchronous: DB-25" (page 33)
• "RS-232 Asynchronous: RJ-45" (page 35)
• "Cabling Pin-outs for HP Proprietory RJ45 and DB25 Devices" (page 38)

RS-232 Asynchronous: DB-25

This section provides pin diagrams for a DB-25 cable.
Table B-1 lists the DB-25 pin assignments on the 8 male connectors at the end of the AD278A
fan-out cable, or the 16 male ports on the AD281A port module.

DB-25 Pin Assignments

Table B-1 lists the DB-25 pin assigments.
Table B-1 DB-25 Pin Assignments
Signal
GND
TXD
RXD
RTS
CTS
DSR
SG
DCD
DTR
RI

DB-25 Software Handshaking (XON/XOFF) Cable

The three-wire cable is sufficient for a terminal, printer, or other DTE (Data Terminal Equipment)
devices configured for software flow control.
Table B-2 lists the pin-out connection between the DB25 adapter and the DB-25 terminal/printer.
Table B-2 Simple Terminal/Printer Cable
DB-25 Female (Card End)
Signal
TxD
RxD
SG
GND
Description
Chassis Ground
Transmitted Data
Received Data
Request to Send
Clear to Send
Data Set Ready
Signal Ground
Data Carrier Detect
Data Terminal Ready
Ring Indicator
Pin
2
3
7
Shell
DTE Use
N/A
Output
Input
Output
Input
Input
Reference
Input
Output
Input
DB-25 Male (Peripheral)
Pin
Connected to 3
Connected to 2
Connected to 7
Connected (via Shell
shield) to
Pin #
Shell
2
3
4
5
6
7
8
20
22
Signal
RxD
TxD
SG
GND
RS-232 Asynchronous: DB-25 33