PEI Characteristics 2-43
September 2008
Chapter 2 - MTM800 Product Information Manual 6866537D87-F
Benefits:
❏ Quick and easy setup of calls: User do not have to dial and remind on the full subscriber
numbers
12.2 Direct TETRA ID Addressing
12.2.1 ISSI
Regardless of the short addressing scheme used, if the user is provisioned with the capability of
entering a real TETRA ISSI, and the user enters an ID of 7 digits, the number will be interpreted as
a real TETRA ISSI.
13 PEI Characteristics
The terminal supports a eight-wire serial RS232 / V.24 interface via the optional data cable, and a
pre-defined set of the AT commands.
Note: The set of AT commands is not compliant with the TETRA PEI standard [Ref 4].
The terminal also supports 4-wire applications.
13.1 Physical Layer
The terminal PEI physical layer is the EIA-232 E Interface (RS232/V.24) and supports the following
circuits as specified in [Ref 23]:
• Transmit Data (TD)
• Receive Data (RD)
• Request To Send (RTS)
• Clear To Send (CTS)
• DCE Ready (DSR)
• DTE Ready (DTR)
• Carrier Detect (CD) (Received Line Signal Detector)
• Ring Indicator (RI) (Never Asserted)
The connection with the data device and opening of the PEI port is done when the user turns the
external device option on from the menu.
13.1.1 Baud Rate
The terminal supports the standard PEI baud rates specified in [Ref 23] from 300 bps to 57,600 bps.
The auto baud rate detection mechanism is not supported.
13.1.2 PEI Flow Control
The terminal provides hardware flow control when the data traffic flows in the direction TE2 to MT2.
The flow control will use the RS232 request to send (RTS) and clear to send (CTS) lines.
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