Keyscan Technical Guide (PC109x - 04.12)
151
Appendix E – Keyscan
COMMex
Appendix E reviews typical COMMex connections to extend communication distances from PCs to access
control units.
The Keyscan COMMex kit includes two circuit boards. Use one COMMex circuit board as the transmitter and the
other as the receiver. Both circuit boards are identical with the exception that one of the circuit boards is
mounted in a black case. The circuit board in the black case can be mounted in proximity to the PC or removed
from the case if it is to be mounted in a remote enclosure. The maximum distance from the PC is 100 feet.
Table 26 – COMMex Power Specifications
Unit Power Notes
COMMex kit 12 VDC, 300 mA
Table 27 – COMMex Communication and Cables
Communication Type Maximum Distance Cable
RS232 100 feet Minimum 18 AWG or 22 AWG 3 conductor shielded
RS485 4000 feet CAT 5 – 2 twisted pairs
Installation Notes on COMMex
From the COMMex circuit board that connects to the PC, insert the female socket end of data cable 40-
2322 into a COM port. Be sure to connect the shield to an earth ground.
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