LICAL-TRC-MT View Datasheet(PDF) - Unspecified
Part Name
Description
MFG CO.
'LICAL-TRC-MT' PDF : 44 Pages View PDF
Serial Interface Connections
The serial interface on the MT Series can be connected to any device
capable of serial communication, including microcontrollers, RS-232 drivers
and computers. The figure below gives an example of connecting the MT
to the Linx QS Series USB module for connection to a computer.
USB Type B
Connector
4
GND
3
DAT+
2
DAT -
1
5V
GND
1
2
3
4
5
6
USBDP
USBDM
GND
VCC
SUSP_IND
RX_IND
RI 16
DCD 15
DSR 14
DATA_IN 13
DATA_OUT 12
RTS 11
7 TX_IND
8 485_TX
CTS 10
DTR 9
SDM-USB-QS
Figure 19: MT Series Transcoder Serial Interface to a PC
1
2
3
4 GND
VCC
V+ 8
7
6
NC
5
NC
MAX4544
VCC
1 VCC
2 D6
3 D7
4 CRT/LRN
5 ENC_SEL
6 SER_IO
7 CONFIRM
8 TR_PDN
9 TR_SEL
10 TR_DATA
GND 20
D5 19
D4 18
D3 17
LATCH 16
SEL_BAUD 15
MODE_IND 14
D2 13
D1 12
D0 11
LICAL-TRC-MT
The USB module follows the RS-232 convention of using separate lines
for data input and data output while the transcoder has a single line for all
data. This requires a switch to alternatively connect the transcoder’s SER_
IO line to the data lines on the module.
The RTS line is used to throw the switch as well as to activate the CRT/
LRN line placing the transcoder into Serial Mode. This gives the PC the
ability to control when communication is initiated.
The MODE_IND line will go high when the transcoder is prepared to send
data, so the CTS line on the USB module is used to monitor the MODE_
IND line. This allows the computer to know when to throw the switch and
look for data from the transcoder.
One point of note is that voltage translation may be necessary if the 5V
USB module is used to communicate with a transcoder operating at 3V.
There are many components and methods for implementing level shifting,
so it is up to the designer to determine the best solution for the product.
F
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