TransCore MPRX Series - Page 95

• Enter Command #641. Press ENTER.
• Leave the setting on RF-by-input control for normal operation.
Sense Inputs
The RS–232 configuration used by the MPRX has two sense inputs — SENSE 0 and SENSE 1. SENSE 0
is used to enable RF on antenna ports 0 and 1 if enabled, and SENSE 1 is used to enable RF on antenna
ports 2 and 3. The sense input circuits are used to notify the MPRX of train presence and are designed to
be connected to a free-of-voltage dry contact. The MPRX sense inputs are designed to connect to a dry
contact closure.
You can configure the MPRX to generate input status change reports, which are transmitted like tag IDs.
The host can then respond based on the true/false (closed/open) status of the sense inputs. Refer to the
section “Reports” on page 6–92“.
The following procedures describe how to set sense inputs using the terminal emulation software. Refer to
command “694N Select Input Inversion Option” on page 5–80 for more information.
To set sense inputs
1. Ensure that the host device is in command mode.
2. Enter Command #6940 to disable input inversion (factory default) or Command #6941 to enable
input inversion, and press ENTER.
Sense Output Device
The sense output is dedicated for testing and set up of the reader. It is defined as the TAG_LOCK signal
and indicates that a valid tag is in the read field.
This sense output is a dry contact that provides a normally open and normally closed sense output. The
relay contacts are rated at 42.2V AC peak (30 Vrms) or 60V DC at 1 A maximum. If controlling an external
gate or device requiring high current, an isolation transformer is required.
Serial Port Communications
The MPRX supports one RS–232 communications port. For the RS–232 communications specification, the
MPRX maintains the following three sets of parameters that aect serial port communications:
• Port configuration parameters (baud rate, data bits, stop bits, parity)
• Communications protocols (basic, error correcting)
• Flow control scheme (none, software)
The default serial port configuration for each of these three parameters is as follows:
• 9600 baud, 8 data bits, 1 stop bit, no parity
• Basic communications protocol
• Software flow control (XON/XOFF)
You can change these parameters in data mode and command mode operation by issuing commands
with the host device. Use the following procedures to set serial port communications parameters using the
terminal emulation program.
Chapter 6 Configuration
TransCore Proprietary
6–95