Information in this manual is intended only to assist our … MODCELL instruments via the Instrument Communications Network … The ICN Interface Board is an ICN controller card only and … ICN Mini Link/External User’s Guide 1733N Model A - Mini Link/EXT (Version 1) 1732N Model A - ICN Interface Board (Version 1) The 1733N Mini Link/EXT (External) with 1732N ICN Interface Board, Figure 1-1, provides a general purpose serial interface to MOD 30 and MODCELL instruments via the Instrument Communications Network (ICN). The 1733N Mini Link/EXT supports one ICN and the 1732N ICN Interface Board supports a second ICN. The External Mini Link provides intelligent buffers that enable the operation of higher level devices (such as personal or other computers) by: •Assembling display and tuning information for a number of instruments and storing the data in block format. This relieves the host from executing individual requests and improves the efficiency of the communications.

IB-23C004 INTRODUCTION Physically the Mini Link/EXT is a standalone interface box with two serial port connections for host PC communications and up to two network connections for ICN communications to MOD 30 and MODCELL instruments. The base configuration consists of: •Two Serial Ports The two RS-232C serial ports (one DB9 and one DB25) have individually configurable baud rates in the range of 300 to 19200 bps. The standard protocol is: Parity - None, Data Length - 8 bits, Stop Bits - 1. The second serial port could be used to provide redundant control of the instrument system. •One Instrument Communications Network Controller The base ICN Controller is accessed via a two-wire or three-wire connection at the rear of the box using the three screw terminal block at the connection marked “ICN0″. Communication can be maintained between the personal computer and up to 15 field instruments. •Optical Isolation Between Instruments and Personal Computer The optical isolation feature is jumper-selectable (see Section 2.3, Jumper Settings ) and provides a minimum of 3000 Vdc electrical insulation between the Instrument Communications Network and the personal computer. THIS FEATURE IS NOT FACTORY SET. •External Pushbutton Reset A 750ms reset pulse can be issued to the External Mini Link by pressing the reset button located at the rear of the box. The button is prominently labeled “RESET”. •Front Panel Indicators The front panel of the External Mini Link is divided into two sections labled ICN0 and ICN1. Each section has three LED indicators as described below: ENABLEDWhen lit, this LED indicates that the circuit controlling the instrument communications through the corresponding ICN is active and responding properly to the main processor. RCV This LED flashes during instrument to Mini Link/EXT digital com- munications. SEND This LED flashes during Mini Link/EXT to instrument digital com- munications. The 1733N Mini Link/EXT can be enhanced with a 1732N ICN Interface Board to provide communications access to an additional 15 field instruments. This daughter board is mounted to the External Mini Link board and is accessed via a two- or three-wire connection at the rear of the box using the three-screw terminal block at the connection marked “ICN1″.

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