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SR/AI
SR/AP
Hardware Reference
Release r09
Page 16 of 76
3.5.1 3-Wire Serial Interface
When using only GND and UART-RXD, UART-TXD serial lines, leave UART-RTS# and UART-
CTS# open.
Note: It is strongly recommended to use hardware flow control. Not using flow control can cause
a loss of data. When RTS/CTS is not used (3-wire interface) the DTE may sent a limited number
of Bytes (depending on buffer size) to the UART interface of the SR without losing data
(e.g. 1 kByte by using firmware version 1.310).
2
SR
GND
MAX3241
14
+3V3
22
23
2
3
7
8
4
6
1
9
TXD
RXD
RTS#
CTS#
IUR-OUT#
IUR-IN#
TXD
RXD
RTS
CTS
DTR
DSR
DCD
RI
RS232
DSUB9 (male)
DTE style connector
9
4
10
5
11
6
7
8
19
13
18
12
17
16
15
F-4
D-2
D-7
F-3
B-4
D-5
UART_TXD
UART_RXD
UART_RTS#
UART_CTS#
IUR-OUT#
IUR-IN#
SHDN#
EN#
100n
100n
28
24
1
+3V3
100n 100n 100n
26
3
27
25
V+
VCC
V -
GND
C2+
C2-
C1+
C1-
220R
220R
220R
220R
220R
220R
5
SigGND
can be left open
VSUP
+3V3
Figure 5: SR Example Serial Interface (RS-232) Supporting UICP
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