MITSUBISHI ELECTRONICS AMERICA, INC.
ST200 Series Technical Support Manual
26
January 2000
Mitsubishi Electronics recommends the following DTE setup:
Communication rate
4800bps
Character format
8 bits, No parity, 1 stop bit
Flow Control
None
1.
Use a serial port (COMx), on the PC to MT connection for data transmission.
Note: The COM1 port is normally utilized for this connection.
2.
The MT transmits all data transparently (RTS signal line is not used / CTS line always high)
so HW flow control is not necessary (i.e. ignored) but software flow control between end
equipment can be used (e.g. XON/XOFF).
3.
When choosing a modem driver, select a basic Hayes compatible 4800bps modem as default,
or something as close to this as possible.
4.
Various transfer protocols are supported; the standard configuration should be Zmodem.
5.8.6 Net Radio/Dispatch Operation
Net Radio or Satellite Dispatch capability is a special MT function that provides a half-duplex
digital network (or talk group) capability. This service requires the use of the Push-to-Talk
(PTT) Microphone (SZ300A), external speaker accessory, and a separate service subscription.
A customer can configure and re-configure up to 256 talk groups, or dispatch channels, with as
many as 10,000 MTs in all talk groups. Each MT can belong to 15 different talk groups. Talk
group configurations and attributes download from the ground segment every time an MT
powers on. The Net Radio service uses special protocols and messages on each of the previously
defined channels for downloading system parameters, setting up and tearing down networks, and
establishing communications between the speaker and all other members in a talk group.
Dealers should be able to provide end-users with more detailed information on Net Radio service
offerings.
5.9 Possible Cable Extensions
The following figure and table describe acceptable cable extensions for Mitsubishi MT
configurations. MT modifications should not include full lengths for Extension A and Extension
B. Note that adding any extension cable exposes the MT to various electromagnetic interference
conditions, therefore Mitsubishi Electronics does not guarantee audio performance.
