Cinterion
®
Java Terminals Hardware Interface Description
4.4 Electrical Specifications of the Application Interface
44
EHSxT_BGS5T_HID_v02
2014-05-23
Confidential / Preliminary
Page 39 of 70
4.4
Electrical Specifications of the Application Interface
4.4.1
On/Off Control
4.4.2
RS-232 Interface
4.4.3
USB Interface
All electrical characteristics according to USB Implementers' Forum, USB 2.0 Specification.
Table 19:
On/Off control line specifications
Parameter
Description
Conditions
Min.
Typ
Max.
Unit
V
high
Input voltage
IGT_IN, RST_IN
active high
4
28
V
V
low
0
3
V
V
high
Input voltage
DTR
active high
3
+15
V
V
low
-15
1.2
V
R
IN
Input resistance of
IGT_IN, RST_IN
1
M
R
IN
Input resistance of
DTR
3
5
7
k
Table 20:
RS-232 interface specifications
Parameter
Description
Conditions
Min.
Typ
Max.
Unit
V
OUT
Transmitter output voltage
for
RXD, CTS, DSR, DCD,
RING
@ 3k
load
±5
±6
±7
V
R
OUT
Transmitter output resis-
tance
RXD, CTS, DSR, DCD,
RING
300
R
IN
Resistance
TXD, RTS, DTR
3
5
7
k
V
In
Receiver input voltage
range
TXD, RTS, DTR
-25
+25
V
V
RIHYS
Input hysteresis
0.5
V
V
Ilow
Input threshold low
0.6
1.2
V
V
Ihigh
Input threshold high
1.5
2.4
V
Baudrate
Autobauding
1.2
230
kbps
Fixed range
1.2
230
kbps
LE
Cable
Length of RS-232 cable
1.8
2
m
