Multiplexer

The 81107 circuit board is a single line multiplexer. Communications are medium speed; 32.5 kbaud for RS422 or 125 kbaud for fiber optics. Eight channels (A-H) are provided; any channel may be connected to a standard 81034 channel (i.e. channel A, B, or C, or any combination of the previous). The 81107 can be compared to an 8 channel opto coupler and in fact serves the same function. A typical use of the 81107 is in large systems where up to eight cable runs between buildings, or remote locations, can be placed with a 2 pair twisted, shielded cable or a duplex fiber optic cable. The economic benefit in using the 81107 as a single line multiplexer is realized only where the board replaces the 8 to 16 opto couplers presently used for communications or where extremely long cable runs between processor groups are encountered. In the latter case, the fiber optic option is suggested because it has an effective range of approximately 2 kilometers. The 81107 (B version and above) can also be used to interface an IBM ™ compatible computer along with MTI’s 51113 to field devices. The 51107 (B version and above) can be configured for many different applications.