PDS interfacing

Connector pinning and wiring to Hosts or other Modules

» Posted on 19. May 2013

Related links:  PDS-ModulesQuick-Start | Commands | Programmer


 

Interfacing PDS Modules

 

PDS 3D assembly with sensor back

 

PDS modules are grouped into two types: PDS modules with only digital outputs and PDS modules with simultaneous digital and analog outputs. This leads into two different interface wiring-maps. The signals on the two connectors are mostly the same except the signals on pin# 1 and 2 as described in the two following tables. Both types can be connected to a PC directly over the RS232 port or via a RS232-to-USB converter to the USB port of a PC.

PDS modules which are marked with a “-A” at the end of their part numbers are the PDS modules, which can output sensor data digitally and analog at the same time: 

PDS modules with analog and digital signal outputs
PDS_8pin_interface Pin# Signal Name Electrical data   Description
1 TempOut 0… 2500 mV   Analog Temp output
2 SensorOut 0…3300 mV   Analog Sensor output
3 +5V 5V ±10%   Power Supply input
4 TxD RS-232 levels   Serial data output
5 BSLprg RS-232 levels   BSL programming Signal
6 RxD RS-232 levels   Serial data input
7 Reset RS-232 levels   Reset input signal, low active
8 GND 0V   Ground Signal

 

PDS modules, which have a second RS-232 interface instead of the analog signals can be interconnected to each other directly building a chain of detectors capable of communicating with each other without the need of any host(s) in between: 

PDS modules with two digital interfaces and no analog outputs
PDS_8pin_interface Pin# Signal Name Electrical data   Description
1 TxD1 RS-232 levels   Serial data output 1
2 RxD1 RS-232 levels   Serial data input 1
3 +5V 5V ±10%   Power Supply input
4 TxD0 RS-232 levels   Serial data output 0
5 BSLprg RS-232 levels   BSL programming Signal
6 RxD0 RS-232 levels   Serial data input 0
7 Reset RS-232 levels   Reset input signal, low active
8 GND 0V   Ground Signal

 

 

PDS – to – RS232

PDS module directly connected to a PC / Host using the PDS – to BSLcomLink / Serial Cable:

PDS_interfacing_RS232

Pin# PDS-Signal Description PC-Signal Pin#
4 TxD (out) PDS data transmit line to host / PC RxD (in) 2
6 RxD (in) PDS data receive line from host / PC TxD (out) 3
8 GND Ground GND 5

When the PDS module is connected to the PC’s RS232 port directly, additionally an external stabilized power supply must provide +5V power to the PDS module over the pins shown in the table below:

Pin# PDS-Signal    Description
3 +5V    Positive pol of the external stabilized power
8 GND    Negative pin of the external stabilized power supply

 

 

 PDS – to – USB

PDS module can be connected to a PC over the BSLcomLink adapter and the PDS – to BSLcomLink / Serial Cable. This Adapter is not only a RS232-to-USB converter, but also provides the PDS module with needed power sourced by USB host. The firmware of the PDS module can also be updated via this adapter using the boot-strap-loader software called “BSLcomLight”.

PDS_interfacing_USB

Pin# PDS-Module Description BSL-DB9 Pin#
3 +5V (in) +5V power from USB host Vbus 1
4 TxD (out) PDS data transmit line to host  RxD (in) 2
5 BSLprg (in) boot-strap-loader signal nRTS (out)  7
6 RxD (in) PDS data receive from host TxD (out)  3
7 Reset (in) Module reset signal from host nDTR (out)  4
8 GND Ground GND  5

 

 

 PDS – to – PDS  Interconnection

As a special variant the two analog signals on the pin numbers 1 & 2 are replaced with a secondary RS232 signal pair, TST=BSLprg and RST=Reset. In this hardware configuration the PDS modules can be chained together via the serial port as shown below:

 

PDS_CascadedChain

For this and other sophisticated solutions please contact us for more details.  

 

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