Interfaces - Equinox Systems ESP-2 MI Installation Manual

The lower left area of the front panel contains two electrical connectors. You may use one of
these, but not both. For more information, see Electrical.
The LAN connector is used with a 10BaseT or 100BaseT LAN interface cable. A CAT 5 cable
is required for 100BaseT operation.
The two PORTS connectors are standard DB-9 DTE ports in RS-232 mode. The unit ships
with RS-232 mode enabled for both ports.
Table 2 describes the LEDs and buttons on the front panel.
Item Description
POWER The POWER LED is lit when the ESP is connected to a power source
ON LINE The ON LINE LED is lit (not blinking) when the ESP self-test and initialization
procedures have completed successfully
10 The 10 LED is lit when the ESP is connected to a 10 Mbps LAN, and the 100
LED blinks when traffi c is present
100 The 100 LED is lit when the ESP is connected to a 100 Mbps LAN, and the 10
LED blinks when traffi c is present
RESET Pushing the RESET button reboots the ESP
INIT Pushing the INIT button restores the ESP to factory defaults
For information about using the RESET and INIT buttons, see Reinitializing and Resetting.

Interfaces

Each port supports the standard RS-232 DTE serial signals via a male DB-9 connector, with the
exception of RI. Each port can be configured independently to support the following interfaces:
• RS-232 DTE signaling (default)
• RS-422 signaling
• RS-485 2-wire half duplex (HD) signaling
Internal jumpers are used to select the signaling for each port. For more information, see
Changing the Interface Settings.
A software configurable option lets you enable/disable a one port option. When enabled, only
port 1 is used. This option can be set during driver installation.
When RS-485 HD signalling is set via internal jumpers, software-configurable modes can
be set to control the enabling/disabling of the transmitter and receiver. The choices are RTS
(Request to Send) control mode or ADDC (Automatic Data Detection Control) mode.
• In RTS mode, the transmitter is enabled and the receiver is disabled when RTS is true.
The transmitter is disabled and the receiver is enabled when RTS is false.
• In ADDC mode, the transmitter is enabled and the receiver is disabled when a space
(zero) bit is sent. The transmitter is disabled and the receiver is enabled when a mark
(one) bit is set. This mode allows rapid turnaround and release of the data pair.
The RS-485 transfer mode can be specified during driver installation or through the web interface.
2
Equinox ESP-2 MI Serial Hub Installation Guide
Table 2. LEDs and Buttons