EntraGuard
®
Titanium Telephone Entry Controller
Quick Start Guide
Page 14 of 26
P/N: 01962-001 Rev. D
5.2.2
RS-232 Serial Port
Using the RS-232 serial port for communication between the EntraGuard unit and the host computer may be done one of
two ways:
•
by direct connect
•
through an external modem.
For either of these options, the INT_MODEM J11 jumper should not have a jumper across it. Verify there is no jumper set
across J11 (see Figure 2 on page 2) when using the RS-232 serial port for communication.
NOTE: Do not use male/female gender changer plugs or 25-pin to 9-pin adapters when making RS-232 serial port
connections. These devices may have internal wiring changes that can disrupt communications when implemented in
conjunction with the Keri Systems serial wiring instructions. If you must use a gender changer plug, ensure it is a
“straight-through” plug.
NOTE: When using 56K modems to communicate with remote access control networks, all modems must use the same
communication format - either X2 or Flex. Incompatibilities between the two formats make some modems of one format
incapable of reliable communication with modems of the competing format. Modems using the V.90 specification are
compatible regardless of whether they are from an X2 or Flex manufacturer.
