MERRICK MC3 Hardware Manual

CPU BOARD
The CPU Board contains the Intel 386EX Embedded
Microprocessor and associated support circuitry for a bus
interface, serial interface and memory support. The newest
CPU board includes two serial ports providing RS-232 and
RS422/485 for both ports. The CPU board is the bottom
board of the card stack.
The RS-485 Serial Communications port is a feature that
provides the circuitry necessary for the MC³ Controller to
communicate with other serial devices such as DF-1 and
Modbus, and adapters for DeviceNet, EtherNet/IP and
Profbus. For more information on MC³ connectivity, see
http://www.merrick-inc.com/mct
NEW CPU BOARD (REV 11 OR NEWER)
+-+-
TX RX
DB9-P (MALE)
COMM 1
TX
+-+-
RX
DB9-S (FEMALE)
COMM 2
SIMM SOCKET
(PROGRAMMING)
CABLE
DC POWER
CPU
Communication Ports
COM 1 RS-232 J7
Pin Signal
2 Rx
3 Tx
4 DTR (+5VDC) Not Fused
5 Com (DC GND)
7 RTS (OUT)
8 CTS (IN)
The RS-232 serial port is not isolated.
COM 1 RS-485 4 WIRE J6
Pin Signal
1 TX +
2 TX -
3 RX +
4 RX -
The 4 wire RS-485 serial port is not isolated, but may float ± 50 V with respect to MC³ ground.
MC3 Hardware Manual 12

MERRICK MC3 Specifications

General

Brand	MERRICK
Model	MC3
Category	Controller
Language	English