CME8000-BUS-LP-04 C-Max, CME8000-BUS-LP-04 Datasheet - Page 11

• Manufacturer Part Number: CME8000-BUS-LP-04
• Description: MOD BUS PCB W/RS485 ANT FULL DUP
• Manufacturer: C-Max

Specifications of CME8000-BUS-LP-04

• 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
5.3 ACK and NAK
5.4 Protocol
CME8000-
SPEC No.
BUS
The protocol is shown in Tables 3,4, and 5. It is demonstrated with all ACKs in the sequence.
Note that an ACK is typically sent in response to a transmitted byte but is also sent in
response to a complete packet transmission and represents a validation of the packet’s
length and CRC. At any point in the process where an ACK can be sent a NAK may be sent
instead. If a NAK is transmitted, the communication sequence is aborted at that point. The
master then has the option of re-starting the sequence (application dependent). A NAK shall
be transmitted only in response to an overrun or framing error detected on (or in lieu of) a
received byte or in response to the reception of a complete packet when the computed
packet CRC does not match the transmitted packet CRC.
An ACK is one byte with a value of 0x06.
A NAK is one byte with a value of 0x15.
The following protocol tables assume that time increments with each row of the table. Up to
200 milliseconds of delay should be tolerated for any expected event (row); an ACK
response to a transmitted byte or the reception of the next byte of an incomplete packet.
The arrows indicate the data direction. Table 3 is for a command sequence, Table 4 is for a
request sequence, and Table 5 is for a response to request sequence. For the request
sequence and response to request sequence, the first data byte is the transmitter’s address.
CME8000-BUS
Revision
B6
26.07.05
State
C-MAX printed
26.07.2005
English
Version
C-MAX
11 of 18
Page