RuggedCom RUGGEDBACKBONE RX1501 - Manual (Page 31)

RuggedBackbone™ RX1501
Installation Guide
Chapter 3
Installation
Transient Suppression 25
Section 3.7.4
Transient Suppression
All copper Ethernet ports on RuggedCom products include transient suppression circuitry to protect against
damage from electrical transients and to ensure conformance to IEC 61850-3 and IEEE 1613 Class 1. This
means that during a transient electrical event, it is possible for communications errors or interruptions to occur,
but recovery is automatic.
NOTE
RuggedCom does not recommend the use of copper cabling of any length for critical, real-time,
substation automation applications.
RuggedCom also recommends against the use of copper Ethernet connections to interface to devices in the field
across distances which could produce high levels of ground potential rise (that is, greater than 2500V), during
line-to-ground fault conditions.
Section 3.8
Serial Ports: RJ45
The RX1501 supports serial port line modules with RJ45 connections. On power-up, all serial ports default to
RS485 mode. Each port can be individually set to RS232, RS485, or RS422 mode via software.
Figure 52: RJ45 Serial Pin Configuration
Table 8: RJ45 RS232/RS485/RS422 Serial Pin Assignment
Pin RS232 Mode RS485 Mode RS422 Mode
1 — — RX-
2 Reserved
3 COM (Isolated GND)
4 COM (Isolated GND)
5 RX — RX+
6 TX TX/RX + TX +
7 CTS — —
8 RTS TX/RX - TX -
Shield Chassis GND
NOTE
Pin 2 is reserved for future IRIG-B output. Do not connect Pin 2 at this time; doing so may cause
hardware damage. Pins 7 and 8 are connected internally. No internal termination is provided. In RS232
mode, these pins enter a high impedance state. A DTE that asserts RTS will see CTS asserted, but
hardware flow control is not performed on the port.