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INSTALLATION LBI-39128
15
on the back of the PMU (this cable will be re-connected
later in the installation).
2. Switch the On/Off switch on the back of the PMU to the
“On” position.
3. Verify that the “PWR” indicator on the front panel of
the PMU stays on continuously.
4. Verify that the three other indicators on the front panel
of the PMU are flashing in a repeating sequence. The
“MUX” indicator should flash once every 250
milliseconds; first by itself, next with the “DATA”
indicator, and then with the “ALARM” indicator.
PMU PROGRAMMING
The PMU’s operational program will use the factory
default values for its operational parameters unless re-
configured by the user. The user-configurable parameters
may be re-configured through the use of an RS232 CRT
terminal (or PC with terminal emulation software) connected
to the PMU.
Changing parameters not covered in this
manual may lead to unsatisfactory operation of
the PMU option.
CAUTION
Terminal Setup
The following initial steps are required to set up the
terminal and access the PMU.
1. Connect the RS232 CRT terminal to the left-hand VDT
Interface connector on the back of the PMU (see Figure
12). (DO NOT plug into the front of the PMU.) If the
RS232 CRT terminal has a male DB-25 port, connect
per Figure 13. If the terminal has a male DB-9 port,
connect per Figure 14.
DO NOT plug the RS232 CRT terminal into the
front panel of the PMU (damage to terminal
may result). This connnector is for another
device in another application.
CAUTION
22
33
Ground
Tx Data
Rx Data
Ground
Rx Data
Tx Data
55
DB-25 (F)DB-25 (M) DB-25 (M)DB-25 (F)
PMURS232 CRT Terminal
(or PC COM Port)
11
Null Modem Cable
4
4
6
7
2020
6
7
RTSRTS
CTS CTS
DSRDSR
DTRDTR
Left VDT Interface
Figure 13 - DB-25 Terminal Connections
22
33
Ground
Tx Data
Rx Data
Ground
Rx Data
Tx Data
Left VDT Interface
55
DB-25 (F)DB-9 (M) DB-25 (M)DB-9 (F)
PMURS232 CRT Terminal
11
Null Modem Cable
4
4
6
7
209
6
7
RTS
RTS
CTS
CTS
DSRDSR
DTR
DTR
8
(or PC COM Port)
Figure 14 - DB-9 Terminal Connections
2. Turn the terminal on and set the communications
protocol per Table 5.
Table 5 - Terminal Communications Protocol
PARAMETER VALUE
Baud Rate 9600 BPS
Data Bits 8
Parity None
Stop Bits 1
3. Press the Enter key one or more times until the
“Disconnected - Hit Any Key To Connect” prompt
appears on the terminal:
Software Initialization
Before you attempt to program any PMU parameters,
all parameters should be returned to the factory default
values. The following procedure is used to initialize the
PMU with its factory defaults: