Serial Server User’s Guide
Document #40179-120 Rev. A
C-1
Appendix C: Serial Port Pinouts
TCP Port Connections
The TROY Serial Server supports port connections over TCP/IP using raw TCP ports only. The TCP
ports are allocated as follows:
PORT
DESTINATION DEVICE
502
Used for MODBUS communications
3001
RS-232, RS-422, or first RS-485 device in mulitdrop configuration
9100
RS-232, RS-422, or first RS-485 device in mulitdrop configuration
9200 RFC
2217
PIN
RS-232 (DTE)
1
DCD (Data Carrier Detect) Input
2
RxD (Receive Data) Input
3
TxD (Transmit Data) Output
4
DTR (Data Terminal Ready) Output
5
GND (Signal Ground)
6
DSR (Data Set Ready) Input
7
RTS (Request To Send) Output
8
CTS (Clear To Send) Input
9
RI (Ring) or +5 VDC power input (selectable via 3-pin jumper)
PIN
RS-422 and RS-485 (4-wire, full duplex)
2
RD+ (Receive Data +) Differential Input
3
TD+ (Transmit Data +) Differential Output
4
TD – (Transmit Data –) Differential Output
5
GND (Signal Ground)
6
RD – (Receive Data –) Differential Input
9
Op5 VDC power input (selectable via a 3-pin jumper)
PIN
RS-485 (2-wire, half duplex)
3
TD+/RD+ (Transmit / Receive Data +) Differential Bi-directional
4
TD –/RD – (Transmit / Receive Data –) Differential Bi-directional
5
GND (Signal Ground)
9
Op5 VDC power input (selectable via a 3-pin jumper)
