本文档详细介绍了ISO15031-3标准中关于车辆通信接口(MVCI Protocol Module)的接地连接要求。主要内容包括：通过4号针脚(底盘接地)和5号针脚(信号接地)提供的接地连接；外部测试设备对接地信号的使用方式；不同接地之间的最小阻抗要求；以及在包含多个MVCI模块的系统中，系统集成商确保整个系统符合接地要求的责任。
For interfacing to vehicles that use the ISO 15031-3 connector, ground connections are provided via pin 4
(Chassis Ground) and pin 5 (Signal Ground). An EC and MC compliant MVCI Protocol Module shall comply
with all requirements of ISO 15031-3 with respect to the usage of these ground signals. These specifications
require that the signal ground contact be used by the external test equipment as the signal ground reference
for vehicle communication transceivers. The specifications also allow the external test equipment (MVCI
Protocol Module in this case) to use either ground as the power ground return subject to a limit of 1,5 A that
can be returned through the Signal Ground contact (pin 5).
An additional requirement is that the two grounds (pins 4 and 5) shall not be connected together within the
MVCI Protocol Module. ISO 15031-3 and SAE J1962) specifies that the minimum impedance shall be 1 MΩ
between each of the following:
⎯ External test equipment connector contacts 4 and 5,
⎯ External test equipment connector contact 4 and the external surface of the external test equipment,
⎯ External test equipment connector contact 5 and the external surface of the external test equipment.
For systems consisting of more than a single MVCI Protocol Module, it is the responsibility of the system
integrator to ensure that these requirements are met for the entire system.
(Chassis Ground) and pin 5 (Signal Ground). An EC and MC compliant MVCI Protocol Module shall comply
with all requirements of ISO 15031-3 with respect to the usage of these ground signals. These specifications
require that the signal ground contact be used by the external test equipment as the signal ground reference
for vehicle communication transceivers. The specifications also allow the external test equipment (MVCI
Protocol Module in this case) to use either ground as the power ground return subject to a limit of 1,5 A that
can be returned through the Signal Ground contact (pin 5).
An additional requirement is that the two grounds (pins 4 and 5) shall not be connected together within the
MVCI Protocol Module. ISO 15031-3 and SAE J1962) specifies that the minimum impedance shall be 1 MΩ
between each of the following:
⎯ External test equipment connector contacts 4 and 5,
⎯ External test equipment connector contact 4 and the external surface of the external test equipment,
⎯ External test equipment connector contact 5 and the external surface of the external test equipment.
For systems consisting of more than a single MVCI Protocol Module, it is the responsibility of the system
integrator to ensure that these requirements are met for the entire system.
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