MPC 1250, Operator'S Manual, Page: 36 / 44

Section VI Control Interface Details
006-0007207 MPC-1250DC Guide Rev F 36 of 44 03/03/2022 www.synqor.com
Digital Input/Output Control Signals
There are 2 input and 5 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:
Signal Pin Number Function
+5 V 8
Bias voltage with minimal current drive usable as a pull‑up voltage
for the open collector output signals (100Ω source resistance)
GND 4 and 5 Ground reference for all digital inputs and outputs
ACIN_GOOD 7
Open collector* output where “low” indicates AC Input voltage is
within range
OUT_OK 14
Open collector* output where “low” indicates DC Output voltage
is within range
OVER_TEMP 15
Open collector* output where “low” indicates that the MPC is at
or above its maximum temperature
REMOTE_START 12 Drive this line “high” with ≥ 5mA to enable the MPC outputs
SHUTDOWN 13 Drive this line “high” with ≥ 5mA to disable the MPC outputs
*with an internal 50 kΩ Pull‑up Resistor to 5 V and ESD Protection Diodes.
RS232 Serial Interface
The same User I/O female high‑density DB15 connector also provides for an RS232 interface
between the MPC and the host/system computer. The interface has a 115.2k baud with eight data
bits, no parity bit and one stop bit. The pin assignments and functions for this RS232 interface
are as follows:
Signal Pin Number Function
GND 4 and 5 Ground reference for RX and TX signals
RX 3 RS232 DCE/MPC Device Receive signal
TX 2 RS232 DCE/MPC Device Transmit signal
The RS232 port provides readback of MPC’s state, as well as the configuration and control of the
MPC’s operation. The port can be used from a standard terminal interface, or from a custom
computer application.