Product Overview

Remote Reset

The MEC120R, MEC120RC, or any chassis type with the appropriate plug-in board installed pro-

vides remote reset capabilities in the event of the lockout condition. A remote reset switch consists of

a dry contact such as a remote momentary push-button wired to the two (2) terminals located on the

plug-in board as shown on the front page. The reset switch will also force the MicroM to recycle if

depressed and released during the purge or run period.

CAUTION: Remote reset is recommended only on a control solely for proved ignition pro-

gramming (pilot ignited burner) or a control for use only with applications in which unburned

fuel cannot accumulate and that is intended for installation in inaccessible locations such as

open-flame, ceiling-suspended gas heaters.

REMOTE DISPLAY

The MicroM provides an interface to the optional ED510 display module. The ED510 connects to

the MicroM through the plug-in board using a ED580 cable. The ED580 cable is available in 2, 4, or

8 foot lengths. Part number 129-145 -1 (4 ft.), -2 (8 ft.), -4 (2 ft.) is available for remote mounting the

ED510 Display Module.

COMMUNICATIONS

In order to interface with upper level systems such as PLC’s, the MicroM provides a communication

interface utilizing a Modbus protocol. Communication is implemented using two wire, twisted pair

RS485 at 4800 baud and is accessed through the appropriate plug-in optional board as shown on the

front page. Polarity of lines A and B must be observed. Suggested cable is Belden 8761 or equiva-

lent.

Optional Plug-In Board Modules:

Optional Plug-In Board Description

MED1 Standard local reset switch

MED2 Same as MED1 with display output

MED3 Same as MED1 with remote reset

MED4 Same as MED1 with display output and remote reset

MED5 Same as MED1 with display output and communications

MED6 Same as MED1 with display output, remote reset and communications

MED7 Same as MED1 with communications

FIREYE

MOPT1

3 Manchester Road May 2, 2005

Derry, New Hampshire 03038 USA Supersedes Nov. 1998