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5. RS485 bus
The STD models have a terminal block with a 5-way connector shared with the Power Supply section, as
shown and described below, used to implement the RS485 interface.
Port signals +RxA and –RxB are connected to an internal coprocessor through a transceiver. In the
STD model, which has two RS232 and a RS485 port, this coprocessor selects which of those ports are
connected to the GSM engine's UARTs ASC0 and ASC1. Users can select the ports configuring the decice's
DIP switches. Please read section Interface Description 7 (DIP Switches) to learn how to configure DIP
switches in order to select the port of your choice.
It meets or exceeds the requirements of ANSI TIA/EIA-485-A.
1
2
3
4
5
PIN
SIGNAL
1
-RxB
2
+RxA
3
Auto on
4
VIN
5
GND
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DIRECTION
LIMITS
I/O
I/O
Input
0-VIN
Input
6.5-40VDC
Input
DESCRIPTION
RS485 B signal
RS485 A signal
Automatic restart after shutdown enable
signal (n/a in MTX-65i-RS485 FW2.00
(Auto-on) and MTX-65i-RS485-LC)
Positive power input
Negative power (ground)
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