ANSI C12.18:2006(R2016)

1 Scope
2 References
3 Definitions and Syntax
  3.1 Definitions
      3.1.1 C12.18 Client
      3.1.2 C12.18 Device
      3.1.3 Point-to-point Communications
      3.1.4 Table
  3.2 Document Syntax
4 Protocol Details
  4.1 Order of Transmission
  4.2 Layer 7 - Application Layer
      4.2.1 Data Structure
      4.2.2 Protocol Specifications for Electric Metering
            4.2.2.1 Request Codes
            4.2.2.2 Response Codes
            4.2.2.3 Identification Service
            4.2.2.4 Read Service
            4.2.2.5 Write Service
            4.2.2.6 Logon Service
            4.2.2.7 Security Service
            4.2.2.8 Logoff Service
            4.2.2.9 Negotiate Service
            4.2.2.10 Wait Service
            4.2.2.11 Terminate Service
            4.2.2.12 Partial Table Access Using the
                     Index/element-count Method
            4.2.2.13 Index Count Access Method Examples
            4.2.2.14 Partial Table Access Using the
                     Offset/octet-count Method
  4.3 Layer 6 - Presentation Layer
  4.4 Layer 5 - Session Layer
  4.5 Layer 4 - Transport Layer
  4.6 Layer 3 - Network Layer
  4.7 Layer 2 - Data Link Layer
      4.7.1 Basic Data
            4.7.1.1 Default Settings
      4.7.2 Packet
      4.7.3 Duplicate packets
      4.7.4 CRC selection
      4.7.5 Acknowledgment
      4.7.6 Retransmission
      4.7.7 Time-out
            4.7.7.1 Channel Traffic Time-out
            4.7.7.2 Inter-character Time-out
            4.7.7.3 Response Time-out
      4.7.8 Delays
            4.7.8.1 Turn-around Delay
  4.8 Layer-1 - Physical Layer
      4.8.1 Physical
      4.8.2 Basic Data
      4.8.3 Light Levels
            4.8.3.1 Optical Characteristics
            4.8.3.2 Transmitter Characteristics
            4.8.3.3 Receiver Characteristics
            4.8.3.4 Environmental Lighting Condition
5 Compliance
Annex A - Communication Example (Layer 7 and Layer 2)
Annex B - Packet Transmission Example
Annex C - Service Sequence State Control
Annex D - Compatibility
  D.1 Backward compatibility with previous versions of
      the Standard
  D.2 Forward compatibility with next versions of the Standard
Annex E - Historical Background
  E.1 Foreword of C12.18-1996 and C12.18-1996 (R2002)

Details the criteria required for communications between a C12.18 device and a C12.18 client via an optical port. The C12.18 client may be a handheld reader, a portable computer, a master station system or another electronic communications device.