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Mesa Electronics 7i85 5-channel RS-422 + 4-channel Encoder Daughter Card (view source)
Revision as of 18:46, 22 January 2023
, 18:46, 22 January 2023clarified TTL polarity
== Overview ==
Mesa 25-pin daughterboard that features 5x RS-422 transceivers (transmit/receive pairs and 5V power) for SmartSerial expansion, as well as 4x RS-422/TTL receivers for encoders.
There also exists a 7i85S that has two transmit channels per connector rather than TX/RX channels, making it suitable for step/direction output in addition to encoder feedback.
== Wiring ==
=== SmartSerials ===
{| class="wikitable"
! TB Pin
! RJ45 Color
! Function
! Direction
! Notes
|-
| 1
| style="background-color: #0080ff" | blue
| GND
| 7i85 → SS
|
|-
| 2
| style="background: repeating-linear-gradient(45deg, #0080ff, #0080ff 10px, #ffffff 10px, #ffffff 20px);" | blue-stripe
| GND
| 7i85 → SS
|
|-
| 3
| style="background-color: #00ff80" | green
| RX+
| 7i85 ← SS
| idle = low
|-
| 4
| style="background: repeating-linear-gradient(45deg, #00ff80, #00ff80 10px, #ffffff 10px, #ffffff 20px);" | green-stripe
| RX-
| 7i85 ← SS
| idle = high
|-
| 5
| style="background-color: #ff8000" | orange
| TX+
| 7i85 → SS
| idle = low
|-
| 6
| style="background: repeating-linear-gradient(45deg, #ff8000, #ff8000 10px, #ffffff 10px, #ffffff 20px);" | orange-stripe
| TX-
| 7i85 → SS
| idle = high
|-
| 7
| style="background: repeating-linear-gradient(45deg, #8b4513, #8b4513 10px, #ffffff 10px, #ffffff 20px);" | brown-stripe
| +5V
| 7i85 → SS
|-
| 8
| style="background-color: #8b4513" | brown
| +5V
| 7i85 → SS
|}
=== Encoders ===
{| class="wikitable"
! TB Pin
! Function
! Direction
! RS-422 Mode
! TTL Mode
|-
| 1
| A+
| 7i85 ← Encoder
| active high (compared to A-)
| active high TTL input w/ pull-up
|-
| 2
| A-
| 7i85 ← Encoder
| active low (compared to A+)
| shorted to A+ via 150Ω resistor
|-
| 3
| GND
| 7i85 ↔ Encoder
|
|
|-
| 4
| B+
| 7i85 ← Encoder
| active high (compared to B-)
| active high TTL input w/ pull-up
|-
| 5
| B-
| 7i85 ← Encoder
| active low (compared to B+)
| shorted to B+ via 150Ω resistor
|-
| 6
| +5V
| 7i85 → Encoder
|
|
|-
| 7
| Z+
| 7i85 ← Encoder
| active high (compared to Z-)
| active high TTL input w/ pull-up
|-
| 8
| Z-
| 7i85 ← Encoder
| active low (compared to Z+)
| shorted to Z+ via 150Ω resistor
|}
== Bill of Materials ==
== Bill of Materials ==