Keri Systems EntraGuard Gold Quick Start - Manual (Page 18)

EntraGuard
®
Gold Telephone Entry Controller
1530 Old Oakland Road, Suite 100 01801-001 Rev. 2.2
San Jose, CA 95112 USA
(800) 260-5265 (408) 451-2520 FAX (408) 441-0309
Web: http://www.kerisys.com E-mail: [email protected]
Page 18 of 32
Quick S
tart Guide
EntraGuard
®
– Gold
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 JP3 jumper should not have a jumper across it. Verify there is no jumper
set across JP3 (see Figure 3 on page 3) 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.