Siemens TC65 Terminal, Hardware Interface Description, Page: 53 / 65

TC65 Terminal Hardware Interface Description
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TC65 Terminal_HD_V02.000b Page 53 of 65 19.02.2007
5.3 Characteristics of the RS-232 interface
Table 28: Characteristics of the RS-232 interface
Function Signal name IO Signal from and level Comment
TXD
RTS
DTR
I
I
I
R
I
min = 3kOhm
V
IL
max = 0.6V
V
IH
min = 2.4V
V
I
max = ±25V
RS232
RXD
CTS
DSR
DCD
RING
O
O
O
O
O
V
O
min = ±5V at 3kOhm load
Leakage Current max = ±25µA at
Module power down.
If lines are unused keep
pin open.
It could be possible to start
the module
with
DTR.
5.4 Characteristics of the SIM Interface for Use with 3V Cards
Table 29: Characteristics of the SIM interface for use with 3V cards
Function Signal name IO Signal form and level Comment
Reset CCRST O
R
O
≈ 47
Ω
V
OL
max = 0.25V at I = +1mA
V
OH
min = 2.5V at I = -0.5mA
V
OH
max = 2.95V
Data IO CCIO I/O R
I
≈ 4.7k
Ω
V
IL
max = 0.75V
V
IL
min = -0.3V
V
IH
min = 2.1V
V
IH
max = CC 0.3V = 3.05V
R
O
≈ 100
Ω
V
OL
max = 0.3V at I = +1mA
V
OH
min = 2.5V at I = -0.5mA
V
OH
max = 2.95V
Clock CCCLK O
R
O
≈ 100
Ω
V
OL
max = 0.3V at I = +1mA
V
OH
min = 2.5V at I = -0.5mA
V
OH
max = 2.95V
Supply CCVCC O V
O
min = 2.75V
V
O
typ = 2.85V
V
O
max = 2.95V
I
O
max = -20mA
Ground CCGND Ground
All signals of SIM interface
are protected against ESD
with a special diode array.