User manual
13
Frequency range
Dual Band
GSM /900/
1900 MHz
UMTS 900/2100 MHz
Depending by frequency band(s) provided by
the network operator, the customer shall use
the most suitable antenna for that/those band(s)
Bandwidth
80 MHz in EGSM 900,
170 MHz in DCS, 140 MHz PCS band
Gain
> 1.5 dBi
Impedance
50 ohm
Input power
> 2 W peak power
VSWR absolute max.
10:1
VSWR recommended
<= 2:1
Table 5: Recommended antenna parameters
2.4 SIM card reader
The HT910 E Terminal is fitted with a SIM card reader designed for 3V SIM cards. It is the flip-up type
which is lockable in the horizontal position and is accessed through a removable panel.
2.5 RS232 Serial Port
The modem supports a standard RS232 serial interface (EIA/TIA 574) via its 9 pin Sub-D connector,
shown below. In line with serial communication terminology the HT910 E Terminal should be
considered as the data circuit-terminating equipment (DCE) and the external application or computer as
the data terminating equipment (DTE). The maximum baud rate to communicate with the HT910 E
Terminal is 230,4 kbit/s.
PIN
Signal
Direction
Voltage levels
Description
1
DCD
Output
> + 4V
<- 4 V
Data carrier detect
2
RD
Output
> + 4V
<- 4 V
Received data
3
TD
Input
> + 2,4V
< 0.8 V
Transmitted data
4
DTR
Input
> + 4V
< 0.8 V
Data terminal ready
5
GND
-
0 V
Ground connection
6
DSR
Output
> + 4V
< - 4 V
Data set ready
7
RTS
Input
> + 2,4V
< 0.8 V
Request to send