DM&P RSIP Device Mode

RSIP Home Page: http://www.dmp.com.tw/rsip 2001/10/30

There are a lot of device modes provide by RSIP and we will show you which one is your chose. You should know two definitions: DTE and DCE.

DTE is acronym for Data Terminal Equipment. Examples of DTE is computers, printers & terminals.
DCE is acronym for Data Communication Equipment. Examples of DCE is modems.

Again, for example: You use a PC with mouse. The PC is DTE and mouse is DCE.

Device Modes

There are 9 pins in RS232 DB9 connector. Two pins, TXD and RXD, are for data transfer and others are control pins.

Device Mode Description
RS232 TXDRXD_DTE RSIP works as a DTE, sending and receiving data on pin TXD/RXD only.
RS232 TXDRXD_DCE RSIP works as a DCE, sending and receiving data on pin TXD/RXD only.
RS232 DTE RSIP works as a DTE, sending and receiving data on all pins.
RS232 DCE RSIP works as a DCE, sending and receiving data on all pins.
RS422/485 RSIP works with RS422/485.
RS485 RTS RSIP works with RS485, always listen. RSIP will receive data it sent via internal loop to verify data is correct or not. It will retry 3 times if the collision occurs.
RS485 /RTS RSIP works with RS485, always listen.

Figures:

RS232 DTE
9 PIN D-SUB MALE
Pin Name Dir Description
1 CD <-- Carrier Detect
2 RXD <-- Receive Data
3 TXD --> Transmit Data
4 DTR --> Data Terminal Ready
5 GND --- System Ground
6 DSR <-- Data Set Ready
7 RTS --> Request to Send
8 CTS <-- Clear to Send
9 RI <-- Ring Indicator
RS232 DCE
9 PIN D-SUB MALE
Pin Name Dir Description
1 CD --> Carrier Detect
2 RXD --> Receive Data
3 TXD <-- Transmit Data
4 DTR <-- Data Terminal Ready
5 GND --- System Ground
6 DSR --> Data Set Ready
7 RTS <-- Request to Send
8 CTS --> Clear to Send
9 RI --> Ring Indicator
RS232 TXDRX_DTE
9 PIN D-SUB MALE
Pin Name Dir Description
2 RXD <-- Receive Data
3 TXD --> Transmit Data
RS232 TXDRXD_DCE
9 PIN D-SUB MALE
Pin Name Dir Description
2 RXD --> Receive Data
3 TXD <-- Transmit Data
RS422/485 Modes

Pin Name Dir Description
TX+ TX+ --> Transmit Data
TX- TX- --> Transmit Data
RX+ RX+ <-- Receive Data
RX- RX- <-- Receive Data

Jumper Wire/Cable

There is a "jumper wire" or "jumper cable" for user to connect two DTC devices or two DCE devices. Because of the pin 2 and pin 3 are changed, two DTE or two DCE devices can communicate with each other. If you use jumper wire to connect to RSIP, device mode should be changed.

RSIP Cable Type RSIP
DTE + Jumper Wire + DTE
DTE + Normal Wire + DCE
DCE + Normal Wire + DTE
DCE + Jumper Wire + DCE

Application Example

Example 1: PC-PC

You can use a jumper wire to connect to each PC.
PC(DTE) + Jumper Wire + PC(DTE)

If you use two RSIP, there are mode can work:
PC(DTE) + Normal Wire + RSIP(DCE) ---- Internet ---- RSIP(DCE) + Normal Wire + PC(DTE)
PC(DTE) + Normal Wire + RSIP(DCE) ---- Internet ---- RSIP(DTE) + Jumper Wire + PC(DTE)
PC(DTE) + Jumper Wire + RSIP(DTE) ---- Internet ---- RSIP(DCE) + Normal Wire + PC(DTE)
PC(DTE) + Jumper Wire + RSIP(DTE) ---- Internet ---- RSIP(DTE) + Jumper Wire + PC(DTE)

Example 2:PC-Mouse

You can use a normal wire to connect mouse to PC.
PC(DTE) Normal Wire Mouse(DCE)

If you use two RSIP, there are mode can work:
PC(DTE) + Normal Wire + RSIP(DCE) ---- Internet ---- RSIP(DTE) + Normal Wire + Mouse(DCE)
PC(DTE) + Normal Wire + RSIP(DCE) ---- Internet ---- RSIP(DCE) + Jumper Wire + Mouse(DCE)
PC(DTE) + Jumper Wire + RSIP(DTE) ---- Internet ---- RSIP(DTE) + Normal Wire + Mouse(DCE)
PC(DTE) + Jumper Wire + RSIP(DTE) ---- Internet ---- RSIP(DCE) + Jumper Wire + Mouse(DCE)

Support

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