The EVK1100 provides two USART Interfaces: Usart 0 and Usart 1 RS232 level converters provide proper voltage levels for compliance to the RS232 standard.
Two RS232 connectors are available:
These two USART Interfaces are connected through level adapter to two DB9 connectors.These have the following pinout:
GPIO Name | Alternate function used |
---|---|
PA 01 | U0_TX |
PA 04 | U0_CTS |
PA 00 | U0_RX |
P4 03 | U0_RTS |
PA 05 | U1_RX |
PA 06 | U1_TX |
PA 08 | U1_RTS |
PA 09 | U1_CTS |
PB 23 | U1_DCD |
PB 24 | U1_DSR |
PB 25 | U1_DTR |
PB 26 | U1_RI |
With the fix explained just below, the cable to use to connect the EVK1100 USART 1 to any DCE is a male-male crossover DB9 cable with 9 conductors including shield, or any equivalent configuration:
MODEM| |EVK1100 USART1 DCE| |DTE DB9-F|DB9-M DB9-M|DB9-F | | | | FGND Shield-Shield ---------- Shield-Shield FGND | | | | DCD 1-1 ---------------------> 1-1 DCD | | | | TX 2-2 <--------- ---------> 2-2 TX | \/ | | /\ | RX 3-3 ---------- ---------- 3-3 RX | | | | DTR 4-4 <------- -------> 4-4 DSR | \ / | | \ / | GND 5-5 ---------\/--------- 5-5 GND | /\ | | / \ | DSR 6-6 --------- --------- 6-6 DTR | | | | CTS 7-7 <--------- ---------> 7-7 CTS | \/ | | /\ | RTS 8-8 ---------- ---------- 8-8 RTS | | | | RI 9-9 > ------------------ > 9-9 RI