User`s manual

MPS Doc: M359_USER_MANUAL REV J Oct 23, 2014 Page 25 of 30
7.3. RS-232 Serial Interface
The RS-232 serial communication interface is available through connector J5 (34), a D-Type
9S connector, located on the back panel of the UPS. This port is a DTE.
Note: When the Optional Ethernet SNMP Agent is installed, this connector serves
as RS-232 Console Interface and has different pin assignments (see the SNMP
User’s Manual).
The RS-232 interface allows control and monitoring of the UPS by a host computer through
the serial RS-232 communication link. For further information about this feature refer to the
Software Interface Manual (available at www.milpower.com). The Table below shows the
RS-232 pin assignment. On the I/O column, “Input” and “Output” entries designate input and
output pins of the UPS.
7.4. Remote Control Interface (Remote Switch)
Note: The M359 is shipped with a mating connector plugged into J4, with jumpers
that enable the unit. If remote control is not desired, do not remove this
connector.
The Remote Control Interface J4 (Fig 10, on next page) provides a means for turning the
UPS ON and OFF and selecting between the UPS Mode and the By-Pass Mode from a
remote panel’s switches. The Pin assignment of J4 is shown on the next page.
Pins 3, 4 and 5 are connected in parallel and serve as a Common Signals Return.
When Pin 8 (the remote PWR ON/OFF pin) is connected to the Common Signals Return, the
M359 is enabled. Opening Pin 8 will disable the M359 (opening all internal relays and
removing power from the Output) regardless of any other control or switch.
When Pin 6 (the remote UPS Select Pin) is connected to the Common Signals Return (and
Pin 7 is open, the UPS Mode will be enabled.
When Pin 7 (the remote By-Pass Select Pin) is connected to the Common Signals Return
and Pin 6 is open, the UPS will be forced into the By-Pass Mode (providing that Pin 8 is also
connected to the Common and the front panel PWR ON/OFF switch is in the On Position.)
Connector J5 RS-232 Pin Assignment
Pin
I/O
Symbol
Description
1
Internally shorted to J3 pin 5. (not used by RS232 link)
2
Input
RXD
Receive Data
3
Output
TXD
Transmit Data
4
Output
DTR
Data Terminal Ready
5
---------
SG
Signal Ground
6
Input
DSR
Data Set Ready
7
Output
RTS
Request To Send
8
Input
CTS
Clear To Send
9
Internally shorted to J3 pin 9. (not used by RS232 link)