雷击和接地浪涌可在相连的远方通信终端间引起很大的瞬时电压差，因此，在两个通信端口内部都配备了浪涌保护装置。具有光耦合数据接口的隔离电源同时还可以减小噪声耦合。为大限度地保证可靠性，所有设备应安装类似的暂态保护装置。同时，如下图所示， RS485 电路的两端也应和一个阻抗进行端接。
ALLEN BRADLEY REPLACEMENT 1395 DC DRIVE POWER BOARD 170
ALLEN BRADLEY DENSO AC SERVO MOTOR 8500-A2D-K1B
MODICON AEG PANELMATE PLUS OPERATOR INTERFACE MM-PM22-2
OKUMA BL-MOTOR 150 LB SERVO MOTOR MISSING LABEL
ABB ROBOTICS DSQC 228 SAFETY BOARD PCB YB560103-BL
NEMATRON INDUSTRIAL COMPUTER OPERATOR INTERFACE ICC-500
ABB ASEA BROWN BOVERI REMOTE I/O MODULE DSQT-239
ALLEN BRADLEY OPERATOR INTERFACE INDUSTRIAL COMPUTER 61
AEG MODICON GETTYS BRUSHLESS AC SERVO MOTOR S20-087-001
FANUC ROBOTICS AXIS CONTROL BOARD PCB A16B-1212-0090/03
ATLAS COPCO R SERVO MOTOR BSM 43180C-R2.5 4230 1904 80
SCHNEIDER TELEMECANIQUE 11kW/15HP VARIABLE FREQUENCY AC
ALLEN BRADLEY 1336 B010 EAD L3 SI, AC DRIVE REFURB
CONTROL TECHNIQUES COMMANDER VARIABLE FREQUENCY INVERTE
FANUC ROBOTICS SPINDLE DRIVE CIRCUIT BOARD PCB A20B-200
CUTLER HAMMER PANELMATE POWER SERIES 45PK PM 4000 / 217
