Section IV
Control Interface Details
006-0006715 10/31/18
Rev J
36 of 44
MPS-MPPS-4000 Guide
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Digital Input/Output Control Signals
There are 3 input and 4 output digital signals available on the User I/O female high-density
DB15 connector. The pin assignments and functions of these digital I/O signals are as follows:
High Density DB15 Female (15 Pin Connector)
Signal
PIN
Function
TX
2
RS232 DCE Device Transmit
RX
3
RS232 DCE Device Receive
GND
4, 5 Ground reference for all digital inputs and outputs
BATTLE_MODE
6
TTL-Input*, pull “low” to engage Battle Mode (disable internal over-temperature protection),
has internal pull-up to +5 V.
ACIN_GOOD
7
Open collector* output where “low” indicates AC Input voltage is within range
+5 V
8
Vout with minimal current drive usable as a pull-up voltage for open collector output signals.
Load must be <35 mA
REMOTE_START
12 Drive this line “high” with ≥5 mA to enable the output
SHUTDOWN
13 Drive this line “high” with ≥5 mA to disable the output
OUT_OK
14 Open collector* output where “low” indicates Main DC Output voltage is within range
OVER_TEMP
15 Open collector* output where “low” indicates that the MPS/MPPS is at or above its maximum temperature
*With an internal 50 k Pull-up Resistor to 5 V and ESD Protection Diodes.
Battle Mode disables internal over‑temperature shutdown limits in the MPS or MPPS
hardware. Battle Mode is indicated with a flashing red light in panel position E2. This mode
can be commanded by pulling low on to I/O Port Pin 6, or via serial command BS ON.
RS232 Serial Interface
The same User I/O female high‑density DB15 connector also provides for an RS232 interface
between the MPS /MPPS and the host/system computer. The interface has a 115.2 k baud
with eight data bits, no parity bit and one stop bit. The pin assignments and functions for this
RS2332 interface are as follows:
Signal
Pin Number
Function
GND
4 and 5
Ground reference for RX and TX signals
RX
3
RS232 DCE/MPS or MPPS Device Receive signal
TX
2
RS232 DCE/MPS or MPPS Device Transmit signal
The RS232 port provides readback of Units’s state, as well as the configuration and control of
the MPS/MPPS’s operation. The port can be used from a standard terminal interface, or from
a custom computer application. For MPPS Units, this port can be used to program the output
voltage, and the output current.
