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參數(shù)資料
| 型號： | ER400TRS |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | LPRS Prelimina ry Data Sheet |
| 中文描述： | LPRS Prelimina ry數(shù)據(jù)表 |
| 文件頁數(shù)： | 3/7頁 |
| 文件大?。?/td> | 68K |
| 代理商： | ER400TRS |
LPRS Preliminary Data Sheet
Easy-Radio ER400TRS Transceiver
Easy-Radio ER400TS-RS 1.3
Copyright LPRS 2002. Iss. 1-3 September 2003
Page 3 of 7
Electrolytic caps 10uF 16v
7
Host Ready
Input
Vcc
Digital Input to indicate that Host is Ready to receive serial
data from transceiver
Positive supply pin. +3.6 to +5.5 Volts. This should be a
‘clean’ noise free supply with less than 25mV of ripple.
Connect to supply 0 Volt and ground plane
RTS function
8
9
Ground
Checklist
1. The module operates internally from an on board 3.3 Volt low drop regulator. The logic levels of the
input/output pins are therefore between 0 Volt and 3.3 Volts. (See specifications).
2. The serial inputs and outputs are intended for connection to a UART or similar low voltage logic
device. Do not connect any of the inputs or outputs directly to an RS232 port. The transceiver
module may be permanently damaged by the voltages (+/- 12V) present on RS232 signal lines. See
Application Circuit (Figure 4) for typical connection to an RS232 port via MAX232 interface IC.
3. The ‘Host Ready Input’ should be tied to 0 Volt (Ground) if not used.
4. The ‘Serial Data In’ should be tied to Vcc if not used. (Receive mode only).
5. Outputs will drive logic operating at 5 Volts and inputs will be correctly driven by logic operating at 5
Volts (CMOS & TTL logic levels).
Antenna
+5V
Figure 3 Application Circuit
Figure 3 shows the connection of the Easy-Radio ER400TRS Transceiver to a PC AT RS232 port. A
MAX232 provides the necessary voltage level shifting required to send and receive serial data at the typical
+/- 12V RS232 signal levels. This IC also inverts the RS232 signal to match those required by the Easy-
Radio Transceiver.
Notes
1. Do NOT connect the Easy-Radio Transceiver directly to an RS232 port as it may cause permanent
damage to the transceiver.
2. The ‘Host Ready Input’ handshake line is shown tied to 0 Volt (Ground) thus allowing any data
received to be immediately sent to the RS232 port. PCs have sufficient internal buffering to accept
and process this data without the need for flow control.
3. The ‘Busy Output’ handshake line is not connected. If data is sent whilst the transceiver is busy (e.g.
transmitting), it will be lost.
4. The PC handshake lines (CTS, RTS) are hard wired to defeat any software that may test the state of
these lines.
5. Windows ‘HyperTerminal’ software built into the Windows operating system provides a useful
method of sending and receiving data to and from a PC during testing. Set the data format
1
2
RF ANT
RSSI
3
4
5
6
7
8
9
DDATA IN
HOST VCC
GND
Article I.
VI
G
N
D
VO
7805
100n
Vin = 8-12V DC
1N4148
100n
DCD
CTS
DTR
RI
GND
5
9
4
8
3
7
2
6
1
PC AT
100n
C1+
V-
T2OUT
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
TR1IN
R1OUT
RT1IN
MAX232
100n
0 Volt
Host Ready Tied Low
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