Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revision Previous revision
reference:pmod:pmodrs232:reference-manual [2017/02/02 02:24]
James Colvin [Additional Information]
reference:pmod:pmodrs232:reference-manual [2017/10/12 20:21] (current)
Martha
Line 1: Line 1:
-====== ​PmodRS232 ​Reference Manual ====== +====== ​Pmod RS232 Reference Manual ====== 
-The Digilent ​PmodRS232 ​(Revision B) converts between digital logic voltage levels to RS232 voltage levels. The RS232 module is configured as a data communications equipment (DCE) device. It connects to data terminal equipment (DTE) devices, such as the serial port on a PC, using a straight-through cable. ​+The Digilent ​Pmod RS232 (Revision B) converts between digital logic voltage levels to RS232 voltage levels. The RS232 module is configured as a data communications equipment (DCE) device. It connects to data terminal equipment (DTE) devices, such as the serial port on a PC, using a straight-through cable. ​
  
 {{Digilent Image Gallery ​ {{Digilent Image Gallery ​
Line 23: Line 23:
  
 =====Functional Description ===== =====Functional Description =====
-The %%PmodRS232%% utilizes the [[http://​datasheets.maximintegrated.com/​en/​ds/​MAX3222-MAX3241.pdf|Maxim Integrated MAX3232 transceiver]] to allow the system board to communicate with UART compatible devices or other components that use a serial interface.+The %%Pmod RS232%% utilizes the [[http://​datasheets.maximintegrated.com/​en/​ds/​MAX3222-MAX3241.pdf|Maxim Integrated MAX3232 transceiver]] to allow the system board to communicate with UART compatible devices or other components that use a serial interface.
  
 ---- ----
 ===== Interfacing with the Pmod===== ===== Interfacing with the Pmod=====
-The %%PmodRS232%% communicates with the host board via the [[pmod:​communication_protocols:​uart|UART protocol]]. The arrangement of the pins is the [[pmod:​communication_protocols:​uart:​old_vs_new|old UART]] communication style (Type 3 in the [[https://​www.digilentinc.com/​Pmods/​Digilent-Pmod_%20Interface_Specification.pdf|Digilent Pmod Interface Specification]]) so that a crossover cable will be required if attaching this Pmod to one of the dedicated UART Pmod headers on any of the newer Digilent microcontroller boards. For a list of which MCU boards use the old UART protocol, see our explanation [[https://​reference.digilentinc.com/​_media/​pmod:​pmod:​connecting_uart_pmod_interfaces.pdf|here]].+The %%Pmod RS232%% communicates with the host board via the [[pmod:​communication_protocols:​uart|UART protocol]]. The arrangement of the pins is the [[pmod:​communication_protocols:​uart:​old_vs_new|old UART]] communication style (Type 3 in the [[https://​www.digilentinc.com/​Pmods/​Digilent-Pmod_%20Interface_Specification.pdf|Digilent Pmod Interface Specification]]) so that a crossover cable will be required if attaching this Pmod to one of the dedicated UART Pmod headers on any of the newer Digilent microcontroller boards. For a list of which MCU boards use the old UART protocol, see our explanation [[https://​reference.digilentinc.com/​_media/​pmod:​pmod:​connecting_uart_pmod_interfaces.pdf|here]].
  
-A pinout description table and diagram for the %%PmodRS232%% are provided below:+A pinout description table and diagram for the %%Pmod RS232%% are provided below:
  
 {{  :​pmod:​pmod:​rs232:​temp2.png?​300|}} {{  :​pmod:​pmod:​rs232:​temp2.png?​300|}}
Line 48: Line 48:
  
  
-There are two jumper blocks on the %%PmodRS232%%; JP1 and JP2. These jumper blocks allow the %%PmodRS232%% to communicate in either a 3-wire or 5-wire operation. When the jumper block on JP2 is loaded and the block on JP1 is unloaded, the on-board chip has its RTS and CTS lines tied together, indicating to the MAX3232 that it is free to transfer data whenever it receives any and enabling 3-wire communication. JP1 must be unloaded in this configuration to ensure that pins 1 and 2 on the Pmod header are not shorted together which could potentially damage the system board. ​+There are two jumper blocks on the %%Pmod RS232%%; JP1 and JP2. These jumper blocks allow the %%Pmod RS232%% to communicate in either a 3-wire or 5-wire operation. When the jumper block on JP2 is loaded and the block on JP1 is unloaded, the on-board chip has its RTS and CTS lines tied together, indicating to the MAX3232 that it is free to transfer data whenever it receives any and enabling 3-wire communication. JP1 must be unloaded in this configuration to ensure that pins 1 and 2 on the Pmod header are not shorted together which could potentially damage the system board. ​
  
 5-wire communication requires that pin 1 of JP1 is connected to pin 1 of JP2, and that pin 2 of both JP1 and JP2 are tied together as well, effectively allowing for CTS/RTS handshaking between the Pmod header and the on-board chip. Both the fifth wire in this configuration and the third wire in the 3-wire communication is the ground signal line. 5-wire communication requires that pin 1 of JP1 is connected to pin 1 of JP2, and that pin 2 of both JP1 and JP2 are tied together as well, effectively allowing for CTS/RTS handshaking between the Pmod header and the on-board chip. Both the fifth wire in this configuration and the third wire in the 3-wire communication is the ground signal line.
  
  
-Any external power applied to the %%PmodRS232%% must be within 3V and 5.5V; however, it is recommended that Pmod is operated at 3.3V.+Any external power applied to the %%Pmod RS232%% must be within 3V and 5.5V; however, it is recommended that Pmod is operated at 3.3V.
 ---- ----
 ===== Physical Dimensions ===== ===== Physical Dimensions =====