Installation guide

7-18 Hospitality systems
RSM BYPASS
Standard 2.0 Meridian Mail Mini and Enhanced Card Option May 2000
Installation and Maintenance Guide
RSM BYPASS
Overview
The RSM breakout board provides BYPASS capability for Port
3 and Port 4 signals, when running Hospitality applications.
BYPASS prevents the interruption of the Option 11C Mini CPU
to PMS communication in the event of a Meridian Mail Mini
interruption or power down.
In BYPASS mode, Ports 3 and 4 signal lines are disconnected
from their respective terminal ports by a set of relays. The eight
relays cross-connect both these ports. In BYPASS mode, a
built-in Null Modem connection is automatically established to
enable terminals in Ports 3 and 4 to talk directly to each other.
The current mode of the RSM is determined by viewing the
green LED on the face of the RSM assembly module. When the
LED is unlit, the system is in BYPASS mode; when the LED is
lit, the system is in NORMAL mode. The BYPASS control line
is connected from the Meridian Mail Mini processor by the
50-pin MDF connector on the Option 11C Mini PBX backplane
to the RSM pack.
The RSM assembly module provides for connection to four
separate RS-232C ports via P1, P2, P3, and P4, or through port
P5 for connecting to the MDF.