C Language Development Kit/Application development/Serial communication

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It is possible to have bi-directional serial communications between the handheld terminal and a serial device through a number of serial communications ports on the handheld terminal.

Available ports on the handheld terminals

COM0 is always used for communication via the direct cable. However not all terminals have the option to connect a cable.

COM1 is for communication through an IrDA dongle, COM2 is for communication with the cradle, but since most cradles have IrDA hardware, there are hardly any differences between COM1 and COM2.

The table below show the available communication ports of each terminal.

Terminal Supported ports Description
H13 COM1 IrDA dongle
COM2 Cradle CRD13
OPH100x COM1 IrDA dongle
COM2 Cradle CRD1001
PHL1300 COM1 IrDA dongle
COM2 Cradle IRU1300
PHL1700 COM0 Direct cable
COM1 IrDA dongle or IRU1700-SV
COM2 Cradle IRU1700
PHL2700 COM0 Direct cable
COM1 IrDA dongle
COM2 IRU2700
DWT7133 COM2 Cradle DCW9133
OPL97xx COM1 Cradle CRD9723 or IrDA dongle
COM2 Same as COM1
COM3 Bluetooth interface, using the SPP profile (OPL9724 only, connect as Master)
COM4 Bluetooth interface, usign the DUN profile (OPL9724 only, connect as Master)
COM5 Bluetooth interface, using the SPP profile (OPL9724 only, connectible as Slave)
DCL153x COM0 USB direct cable
COM1 Cradle CRD9723 or IrDA dongle
COM2 Same as COM1
OPN2002 COM0 USB-VCP (when connected by USB), Cradle (when in cradle)
bluetooth will be added soon
OPN2003 COM0 USB-VCP (Virtual COM port)
PX25 COM1 Cradle CRD9723 or IrDA dongle
COM2 Same as COM1
COM3 Bluetooth interface, using the SPP profile
COM5 Bluetooth interface, using the SPP profile, connectable as slave
COM12 Bluetooth interface, using the HID profile
COM13 Bluetooth interface, using the HID profile, connectable as slave
PX30 COM9 USB-VCP

Setting the communication parameters

The baudrate, the number of data bits, the parity mode, the number of stopbits and the handshaking modes, can all be selected via a systemsetting() function call.

comopen() uses the current settings when opening a communications port. The default settings of the handheld terminal are:

Baudrate 9600 (115200 for the OPH1003)
Parity None
Databits 8
Stopbits 1
Hardware handshaking No
Software handshaking No

The following table shows which communication parameters can be set depending on the terminal model. Click on the links for more details about the related menu-options of the systemsetting() function.

PHLxxxx DWT7133 OPL97xx DCL153x OPH100x & H13
Baudrates Baudrates Baudrates Baudrates Baudrates
Parity Parity Parity Parity Parity
Databits Databits Databits Databits Databits
Stopbits Stopbits Stopbits
Hardware handshaking

The communication parameters set with the systemsetting() function apply to all communication ports. It is not possible to have different settings for different communications ports. Note, that when you change settings of a communications port while it is already open, the settings take not effect immediately. The settings only take effect when you close the communications port (with comclose()) and then open it again (with comopen()).

When a communications port is opened, it will consume more power. Therefore, when it is not necessary to have the port open, it is better to close the port to save power.

To communicate from a terminal to the host and vice versa, both the host and the terminal has to be set to the same baudrate, but also the cradle has to be set to this baudrate. (The DWT7133 cradle is an exception to this, setting of the baudrate is not necessary on this cradle). To set the baudrate on a cradle, use the DIP-switches located on the bottom of the cradle.

Click on your terminal or cradle model below for more details about:

  • Setting of the DIP-switches
  • Controlling the transmission speed
  • RS485 networking
Terminal Cradle
PHL1700 IRU1700 transceiver
IRU1700 transceiver charger
IRU1700 SV
OPH1004 CRD13
OPH1003 CRD1001
PHL1300 IRU1300
PHL2700 IRU2700
DWT7133 DCW9931
OPL97xx CRD9723
CRD9723 multi cradle
CRD9725
DCL153x CRD9723
CRD9723 multi cradle
CRD9725
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