TS-7180 COM Ports: Difference between revisions

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The TS-7180 provides three standard RS-232 COM ports, and one RS-485 COM port.  The latter has auto-transmit-enable. All of these ports are presented on the P5 connector.  The RS-485 port has an on-board terminator that may be enabled by installing the "485" jumper.
 
 
The TS-7180 provides three standard RS-232 ports, and one RS-485 port.  A fourth RS-232 port is a non-standard option. All of these ports are presented on the P5 connector.  The RS-485 port has auto-transmit-enable and an on-board terminator that may be enabled by installing the "485" jumper (adjacent to the RTC battery).
 
=== RS-232 ports 1 through 3 ===


{|class=wikitable
{|class=wikitable
|-
|-
! UART
! UART
! TX
! Linux /dev
! RX
! Connection on Terminal Block P5-A
! To "[[TS-7180 FPGA|steal]] <ref>Writing this value to [[#TS-7180 FPGA|FPGA address 307 or 308]] takes over this UART device for the cell modem or HD12, respectively. While [[#TS-7180_FPGA|"stolen"]], this physical RS-232 connection no longer possesses a UART device.</ref>"
! TX pin
! RX pin
|-
|-
| UART2
| ttymxc1
| ttymxc1
| P5-5
| TX2/RX2
| P5-6
|
| 5
| 6
|-
|-
| UART5
| ttymxc4
| ttymxc4
| P5-2
| TX1/RX1
| P5-3
|
| 2
| 3
|-
|-
| UART7
| ttymxc6
| ttymxc6
| P5-7
| TX3/RX3 (unless "[[TS-7180 FPGA|stolen]]")
| P5-8
| 4
| 7
| 8
|}
|}
<References />
{{Note|The RS-232 transceiver chip on the board must be enabled before those ports can be used.  This is done by running the command <code>tshwctl -a 21 -w 3</code>. }}


=== RS-485 ===


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|}


{{Note|The RS-232 transceiver chip on the board must be enabled before the COM ports can be used. This is done by running the command "'''tshwctl -a 21 -w 3'''" }}
RS-485 on the [[#Terminal_Blocks | P5 terminal block]] is accessible via <code>/dev/ttymxc3</code>, unless that device is [[#FPGA_Registers|"stolen"]] for RS-232 on the XBee/Nimbelink/MultiTech sockets or the HD12 header.


=== RS-232 port 4 (optional) ===


Custom populations may provide a fourth RS-232 uart on P5, at the cost of one of the CAN controllers.  Pin-outs are shown in the table below.
Custom boards may provide a fourth RS-232 port on P5, taking over the pins that by default are assigned to the second CAN controller.  In this case, the pinout of the additional RS-232 port is:


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The [[#Daughter_Card_Interface|daughter-card interface]] (HD12 header) contains TTL-level TX/RX pins that may be used to connect to a CPU UART, with the caveat that to do so, one of the assigned UARTs must be reassigned to the header.  The reassignment is done by writing to the register at address 308 in the FPGA.  The table in the [[#FPGA_Registers|FPGA Registers section]] shows which UARTS may be used.  By default, the HD1 TX/RX pins are not connected to any UART.
The [[#HD12 Header|daughter-card interface]] (HD12 header) contains TTL-level TX/RX pins that may be used to connect to a CPU UART, with the caveat that to do so, one of the assigned UARTs must be reassigned to the header.  The reassignment is done by writing to the register at address 308 in the FPGA.  The table in the [[#FPGA_Registers|FPGA Registers section]] shows which UARTs may be reassigned.  By default, the HD12 TX/RX pins are not connected to any UART.

Latest revision as of 11:14, 11 May 2023


The TS-7180 provides three standard RS-232 ports, and one RS-485 port. A fourth RS-232 port is a non-standard option. All of these ports are presented on the P5 connector. The RS-485 port has auto-transmit-enable and an on-board terminator that may be enabled by installing the "485" jumper (adjacent to the RTC battery).

RS-232 ports 1 through 3

UART Linux /dev Connection on Terminal Block P5-A To "steal [1]" TX pin RX pin
UART2 ttymxc1 TX2/RX2 5 6
UART5 ttymxc4 TX1/RX1 2 3
UART7 ttymxc6 TX3/RX3 (unless "stolen") 4 7 8
  1. ↑ Writing this value to FPGA address 307 or 308 takes over this UART device for the cell modem or HD12, respectively. While "stolen", this physical RS-232 connection no longer possesses a UART device.
Note: The RS-232 transceiver chip on the board must be enabled before those ports can be used. This is done by running the command tshwctl -a 21 -w 3.

RS-485

UART 485+ 485-
ttymxc3 P5-13 P5-14

RS-485 on the P5 terminal block is accessible via /dev/ttymxc3, unless that device is "stolen" for RS-232 on the XBee/Nimbelink/MultiTech sockets or the HD12 header.

RS-232 port 4 (optional)

Custom boards may provide a fourth RS-232 port on P5, taking over the pins that by default are assigned to the second CAN controller. In this case, the pinout of the additional RS-232 port is:

UART TX RX
ttymxc7 P5-10 P5-11


The daughter-card interface (HD12 header) contains TTL-level TX/RX pins that may be used to connect to a CPU UART, with the caveat that to do so, one of the assigned UARTs must be reassigned to the header. The reassignment is done by writing to the register at address 308 in the FPGA. The table in the FPGA Registers section shows which UARTs may be reassigned. By default, the HD12 TX/RX pins are not connected to any UART.

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