Difference between revisions of "Mesa Electronics 7i85 5-channel RS-422 + 4-channel Encoder Daughter Card"

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== 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 ==
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 +
=== SmartSerials ===
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 +
{| class="wikitable"
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! TB Pin
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! RJ45 Color
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! Function
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! Direction
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! Notes
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|-
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| 1
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| style="background-color: #0080ff" | blue
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| GND
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| 7i85 → SS
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|
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|-
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| 2
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| style="background: repeating-linear-gradient(45deg, #0080ff, #0080ff 10px, #ffffff 10px, #ffffff 20px);" | blue-stripe
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| GND
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| 7i85 → SS
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|
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|-
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| 3
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| style="background-color: #00ff80" | green
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| RX+
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| 7i85 ← SS
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| idle = low
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|-
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| 4
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| style="background: repeating-linear-gradient(45deg, #00ff80, #00ff80 10px, #ffffff 10px, #ffffff 20px);" | green-stripe
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| RX-
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| 7i85 ← SS
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| idle = high
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|-
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| 5
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| style="background-color: #ff8000" | orange
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| TX+
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| 7i85 → SS
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| idle = low
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|-
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| 6
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| style="background: repeating-linear-gradient(45deg, #ff8000, #ff8000 10px, #ffffff 10px, #ffffff 20px);" | orange-stripe
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| TX-
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| 7i85 → SS
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| idle = high
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|-
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| 7
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| style="background: repeating-linear-gradient(45deg, #8b4513, #8b4513 10px, #ffffff 10px, #ffffff 20px);" | brown-stripe
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| +5V
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| 7i85 → SS
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|-
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| 8
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| style="background-color: #8b4513" | brown
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| +5V
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| 7i85 → SS
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|}
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=== Encoders ===
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{| class="wikitable"
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! TB Pin
 +
! Function
 +
! Direction
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! RS-422 Mode
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! TTL Mode
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|-
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| 1
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| A+
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| 7i85 ← Encoder
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| active high (compared to A-)
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| TTL input w/ pull-up
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|-
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| 2
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| A-
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| 7i85 ← Encoder
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| active low (compared to A+)
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| shorted to A+ via 150Ω resistor
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|-
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| 3
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| GND
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| 7i85 ↔ Encoder
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|
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|
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|-
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| 4
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| B+
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| 7i85 ← Encoder
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| active high (compared to B-)
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| TTL input w/ pull-up
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|-
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| 5
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| B-
 +
| 7i85 ← Encoder
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| active low (compared to B+)
 +
| shorted to B+ via 150Ω resistor
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|-
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| 6
 +
| +5V
 +
| 7i85 → Encoder
 +
|
 +
|
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|-
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| 7
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| Z+
 +
| 7i85 ← Encoder
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| active high (compared to Z-)
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| TTL input w/ pull-up
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|-
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| 8
 +
| Z-
 +
| 7i85 ← Encoder
 +
| active low (compared to Z+)
 +
| shorted to Z+ via 150Ω resistor
 +
|}
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== Bill of Materials ==
 
== Bill of Materials ==
  

Revision as of 18:29, 22 January 2023

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

TB Pin RJ45 Color Function Direction Notes
1 blue GND 7i85 → SS
2 blue-stripe GND 7i85 → SS
3 green RX+ 7i85 ← SS idle = low
4 green-stripe RX- 7i85 ← SS idle = high
5 orange TX+ 7i85 → SS idle = low
6 orange-stripe TX- 7i85 → SS idle = high
7 brown-stripe +5V 7i85 → SS
8 brown +5V 7i85 → SS

Encoders

TB Pin Function Direction RS-422 Mode TTL Mode
1 A+ 7i85 ← Encoder active high (compared to A-) 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-) 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-) TTL input w/ pull-up
8 Z- 7i85 ← Encoder active low (compared to Z+) shorted to Z+ via 150Ω resistor

Bill of Materials

Name Marking Part
P1 (W) 3.5 [2-pos 3.5mm pluggable header]
P1* (W) 3.5 [2-pos 3.5mm pluggable terminal block] Phoenix Contact 1863152 (similar)
J1 AMP2039 A 5747846-4 TE 5747846-4
TB1,TB2,TB3 (W) 3.5 [24-pos 3.5mm pluggable header]
TB1* (3x),TB2* (3x),TB3* (3x) (W) 3.5 [8-pos 3.5mm pluggable terminal block] Phoenix Contact 1863217 (similar)
U1,U4 [Intersil logo] ISL32173 EFBZ W1829AAZT Renesas ISL32173EFBZ
U2,U6,U9,U10 [Texas Instruments logo] 0AA4EHK G4 26LS32AC Texas Instruments AM26LS32ACDR
U3 [Intersil logo] 8491EIBZ K036AFB Renesas ISL8491EIBZ-T
U5 LVC245A 1500001 YnD913F Nexperia 74LVC245APW,112
U7 [NP]
U8 [onsemi logo] ACT04G PUFM42 onsemi 74ACT04SC
U11 MV342I 07M AP9J G4 Texas Instruments LMV342ID
U12 78M33C TI 05T S83N Texas Instruments UA78M33CKVURG3

Online Resources

7I85 5 Channel RS-422 + 4 Channel Encoder Interface Manual

7I85 4 Channel encoder 5 channel Serial RS-422 interface | Mesa Web Store

AIO Daughter cards | MesaNet

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