![Comtech EF Data CIM-550 Скачать руководство пользователя страница 82](http://html1.mh-extra.com/html/comtech-ef-data/cim-550/cim-550_installation-and-operation-manual_2648467082.webp)
CiM-550 IP Enabled Satellite Modem
Rev. 2
Serial Remote Control
CD/CIM550.IOM
56
EIA 485 (full duplex) summary:
Two differential pairs - one pair for controller to target, one pair for target to
controller.
Controller-to-target pair has one line driver (controller), and all targets have line-
receivers.
Target-to-controller pair has one line receiver (controller), and all targets have tri-
state drivers.
5.3 EIA-232
This a much simpler configuration in which the controller device is connected directly to
the target via a two-wire-plus-ground connection. Controller-to-target data is carried, via
EIA-232 electrical levels, on one conductor, and target-to-controller data is carried in the
other direction on the other conductor.
5.4 B
ASIC
P
ROTOCOL
Whether in EIA-232 or EIA-485 mode, all data is transmitted as asynchronous serial
characters, suitable for transmission and reception by a UART. In this case, the
asynchronous character format is fixed at 8 data bits, one stop bit, no parity. The baud
rate may vary between 50 baud and 19,200 baud.
All data is transmitted in framed packets. The controller is assumed to be a PC or ASCII
dumb terminal, which is in charge of the process of monitor and control. The controller is
the only device which is permitted to initiate, at will, the transmission of data. Targets are
only permitted to transmit when they have been specifically instructed to do so by the
controller.
All bytes within a packet are printable ASCII characters, less than ASCII code 127. In
this context, the Carriage Return and Line Feed characters are considered printable.
All messages from controller to target require a response (with one exception). This will
be either to return data which has been requested by the controller, or to acknowledge
reception of an instruction to change the configuration of the target. The exception to this
is when the controller broadcasts a message (such as Set time/date) using Address 0,
when the target is set to EIA-485 mode.
Содержание CIM-550
Страница 2: ......
Страница 26: ...CiM 550 IP Enabled Satellite Modem Rev 2 Preface CD CIM550 IOMCD CIM550 IOM xxii NOTES...
Страница 38: ...CiM 550 IP Enabled Satellite Modem Rev 2 Introduction CD CIM550 IOM 12 NOTES...
Страница 46: ...CiM 550 IP Enabled Satellite Modem Rev 2 Operation CD CIM550 IOM 20 NOTES...
Страница 69: ...CiM 550 IP Enabled Satellite Modem Rev 2 Front Panel Menus CD CIM550 IOM 43 Figure 4 4 Loopback Modes...
Страница 130: ...CiM 550 IP Enabled Satellite Modem Rev 2 Forward Error Correction CD CIM550 IOM 104 NOTES...
Страница 200: ...CiM 550 IP Enabled Satellite Modem Rev 2 CLI and Telnet Interface CD CIM550 IOM 174 NOTES...
Страница 221: ...CiM 550 IP Enabled Satellite Modem Rev 2 Web Server Pages CD CIM550 IOM 195 12 3 6 9 MODEM CONFIGURATION...
Страница 236: ...CiM 550 IP Enabled Satellite Modem Rev 2 Web Server Pages CD CIM550 IOM 210 NOTES...
Страница 444: ...CiM 550 IP Enabled Satellite Modem Rev 2 SNMP interface CD CIM550 IOM 418 NOTES...
Страница 460: ...2114 WEST 7TH STREET TEMPE ARIZONA 85281 USA 480 333 2200 PHONE 480 333 2161 FAX...