RS485端口，可能无法使用。RS485端口作为一组进行隔离。
多32 369（或其他设备）可以在单个串行通信信道上菊花链连接在一起，而不超过驱动器的能力。对于较大的系统，必须添加额外的串行通道。商用中继器
也可用于将单个通道上的继电器数量增加到多254个。请注意，可能只有
每个串行通信链路一个主设备。
应使用屏蔽双绞线（通常为24 AWG）进行连接。合适的电缆应具有120的特性阻抗Ω （例如Belden#9841）和总电线长度不应超过4000英尺。商用
中继器可以用来延长传输距离。
通信链路远端之间的电压差并不罕见。因此，浪涌保护
设备内部安装在所有RS485终端上。内部是一个带有光耦合数据接口的隔离电源
接口用于防止噪声耦合。源计算机/PLC/SCADA系统应在内部或外部安装类似的瞬态保护装置，以确保大的可靠性。
为了确保菊花链中的所有设备处于相同的电位，必须将每个RS485端口的公共端子连接在一起，并仅在主端口的一个位置接地。未能
这样做可能会导致间歇性或通信故障。
正确的极性也很重要。369继电器必须与连接在一起的所有“+”端子和所有“–”端子连接
端子连接在一起。每个继电器必须以菊花链连接到下一个继电器。避免星型或存根连接的配置。菊花链两端的后一个设备应以120Ω ¼瓦电阻器与1纳滤串联
穿过“+”和“–”端子的电容器。遵守这些准则将产生一个可靠的通信系统
对系统瞬变免疫。
Three independent two-wire RS485 ports are provided. If option (F), the fiber optic port, is installed and used the COMM 3, RS485 port, may not be used. The RS485 ports are isolated as a group. Up to 32 369s (or other devices) can be daisy-chained together on a single serial communication channel without exceeding the driver capability. For larger systems, additional serial channels must be added. Commercially available repeaters may also be used to increase the number of relays on a single channel to a maximum of 254. Note that there may only be one master device per serial communication link. Connections should be made using shielded twisted pair cables (typically 24 AWG). Suitable cables should have a characteristic impedance of 120 Ω (e.g. Belden #9841) and total wire length should not exceed 4000 ft. Commercially available repeaters can be used to extend transmission distances. Voltage differences between remote ends of the communication link are not uncommon. For this reason, surge protection devices are internally installed across all RS485 terminals. Internally, an isolated power supply with an optocoupled data interface is used to prevent noise coupling. The source computer/PLC/SCADA system should have similar transient protection devices installed, either internally or externally, to ensure maximum reliability. To ensure that all devices in a daisy-chain are at the same potential, it is imperative that the common terminals of each RS485 port are tied together and grounded in one location only, at the master. Failure to do so may result in intermittent or failed communications. Correct polarity is also essential. 369 relays must be wired with all ‘+’ terminals connected together, and all ‘–’ terminals connected together. Each relay must be daisy-chained to the next one. Avoid star or stub connected configurations. The last device at each end of the daisy-chain should be terminated with a 120 Ω ¼ watt resistor in series with a 1 nF capacitor across the ‘+’ and ‘–’ terminals. Observing these guidelines will result in a reliable communication system that is immune to system transients.
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