AFX SERIES® OPERATION MANUAL
SECTION 5: UNPACKING AND INSTALLATION
Entire Contents Copyright
2016 by Pacific Power Source, Inc. (PPS) • All Rights Reserved • No reproduction without written authorization from PPS.
AFX Series Power Source Operation Manual
Page 65 of 274
5.17.2
RS232 Serial Interface
A DB9 serial interface connector is located on the rear panel. This connector is also used for
the Remote Inhibit function. Both functions can be used at the same time if needed but a
special cable will be required to do so.
PIN
Abbreviation
Description
Pin 1
N/C
Not connected
Pin 2
TXD
Transmit Data
Pin 3
RXD
Receive Data
Pin 4
DTR
Data Terminal Ready
Pin 5
COM
Common
Pin 7
RTS
Input – Remote Inhibit
Pin 8
CTS
Output – Mode Relay Control
Pin 9
N/C
Not connected
Table 5-3: Standard RS232 DE9 Pin Assignments
If only the RS232 interface function is used, a regular straight through DB9 to DB9 cable can
be used to connect to a PC serial port.
5.17.3
Remote Inhibit or Enable Input
The remote inhibit may be used to provide output shut down if a rear panel rack door is
opened while the output is on. A contact closure between pins 7 and 8 (or an external 5Vdc
supply if MODE RELAY CONTROL is enabled) will allow control of the output relay from
either the front panel or a remote control interface.
There are three modes of operation for this input:
1.
Disabled mode
: In his mode, the Remote Inhibit inputs are not active so this
function is turned off. No short between the RI pins is required to enable the output
in this mode.
2.
Remote inhibit mode
: The two pins have to be shorted for the output to be enabled
from the front panel or remote command. This is a necessary but not a sufficient
condition to enable the output. If the output is enabled and the remote inhibit
connection is open, a fault is generated. This mode is recommended for interlock
safety applications such safety cages and test fixture interlocks.
3.
Remote enable mode
: The output can be enabled by shorting these two pins,
regardless of the output enable command/button. It’s a sufficient condition to
enable the output.
The mode can be selected from the SYST (SYSTEM) menu screen using the Interfaces,
Remote Inhibit selection as shown below.
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