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ManualsBrandsEzurio ManualsElectronicsBluetooth Intelligent Serial Module

Bluetooth Serial Module

AT Command Set

Date : 3 Feb 03 Issue No : 1.9 Doc No : XRBLU020-001SW-0 Page 33 of 38

The pin-out for the 9 way serial connector is as per the table below, and the direction is as seen from the

serial modules point of view.

Pin No. Description Direction

1 Data Carrier Detect DCD Output

2 Transmit TX Output

3 Receive RX Input

4 Data Set Ready DSR Input

5 Ground GND ---

6 Data Terminal Ready DTR Output

7 Clear To Send CTS Input

8 Ready To Send RTS Output

9 Ring Indicate RI Output

One of the main features of the TDK serial module is that it enables the replacement of a serial cable

between a PC and a peripheral such as a modem.

The pin-out on modems is as per the table above, so if the serial cable between a peripheral like a modem

and a PC is to be replaced with 2 serial modules, then the motherboard will plug into the PC as is.

However, the pin-out and the gender at the modem end are not one to one compatible with the

motherboard. So to facilitate a connection, a null modem cable is required as per the diagram below

9 way D-Type MALE

Serial Module End

1:DCD>

2:TX>

3:RX<

4:DSR<

5:GND

6:DTR>

7:CTS<

8:RTS>

9:RI>

Modem

Peripheral End

TX>

CTS<

RX<

DTR>

GND

DSR<

RTS>

DCD>

RI>

In the case of a peripheral which only has a 3 wire uart interface consisting of RX,TX, and GND. Where it

relies on software handshaking, then the cabling between it and the serial module should be as shown in

the diagram below. The XON/XOFF handshaking will be observed by the peer NOT the serial module.