CME8000-BUS-GS-02 C-Max, CME8000-BUS-GS-02 Datasheet - Page 10

• Manufacturer Part Number: CME8000-BUS-GS-02
• Description: MODULE BUS IP65 CASING&ANT RS232
• Manufacturer: C-Max

Specifications of CME8000-BUS-GS-02

• Frequency: 40kHz ~ 120kHz
• Sensitivity: -115dBm
• Modulation Or Protocol: UTC - Universal Time Code
• Applications: Radio Controlled Time
• Current - Receiving: 2mA
• Data Interface: PCB, Surface Mount
• Antenna Connector: On-Board, Wire Antenna
• Voltage - Supply: 2.7 V ~ 5 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: Module
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Memory Size: -
• Data Rate - Maximum: -

Data Sheet
The protocol is designed for use in a master/slave environment. There is no constraint that says a
system must have one master and several slaves.
implemented in a small network type of environment where one device can be a master through one
communication cycle and then become a slave for another communication cycle.
5.1 Data Word
Figure 2. Serial Data Word Example.
5.2 Command Packet
CME8000-
SPEC No.
BUS
o STX is one byte with a value of 0x02. To determine if you have a valid STX, check
o Address is one byte. The radio control module will have an address defined as 0x59.
o The packet length is the number of bytes in the packet including STX, address, packet
o The command or request is one byte defined by the application layer.
o The data may be zero, one, or multiple bytes as defined in the application layer, except for
o The CRC is a 16-bit CRC.
o ETX is one byte with a value of 0x03.
The data will be transmitted in a 8-N-1 format as show in Figure 2. The transmitting device
will send data with 1 start bit, followed by 8 data bits, ending with 1 stop bit. The sequencing
of the data bits will be from LSB (bit 0) to MSB (bit 7).
Where:
A command is used by a master device to request action from a slave. The command
packet has the structure shown in Table 2.
CME8000-BUS
whether an ACK byte follows. If so, the 0x02 is in the middle of a transmission and should
not be interpreted as an STX.
length, command, data, CRC, and ETX. The packet length value is equivalent to 7 + n,
where n is the number of data bytes.
the case of a request. In this case, the first data byte will be the master’s address so the
slave will know which device to respond to.
STX, the CRC byte pair and the ETX. See the Appendix for the CRC source code.
STX
1 byte
Revision
B6
Address Packet
1 byte
S T A R T
Table 2. Structure of Command Packet.
26.07.05
Length
1 byte
State
0
1
1
The CRC is computed on all bytes of a packet except the
0
1
0
2
C-MAX printed
26.07.2005
Comman
d
1 byte
0
3
4
1
Rather, this protocol is intended to be
Data
n bytes
5
1
0
6
English
Version
CRC
2 bytes
7
0
S T O P
C-MAX
ETX
1
byte
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