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INTRODUCTION |
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The TTL-485-2 is a RS485 to TTL
converter, which can be used to convert RS485 to 5VDC
TTL-compatible levels and vice versa. It is also ideal for extending
the TTL distance. The unit is powered from an external 5VDC power
supply. It supports data direction auto-turnaround, and therefore,
no flow control is required.
spec sheet |
FAQ |
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$54.95 |
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FEATURES |
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- Plug and play (Hot-pluggable, Data format Auto-sensing &
Self-adjusting).
- Data direction auto-turnaround, no flow control is required.
- SMT Circuit.
- Built-in Terminating Resistor (120Ω).
- Built-in Static protection circuit (ESD).
- Built-in Short circuit
protection
(RS485 and TTL data line). |
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SPECIFICATIONS |
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Compatibility: |
EIA/TIA
RS-485 standard and TTL level |
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Power Source: |
+5VDC (±5%)
Regulated Power Supply (not included) |
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Current
Consumption: |
Under 30mA |
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Baud Rates: |
300
to 115,200bps (Auto-sensing & Self-adjusting) |
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Distance: |
RS485 side:
Up to
4000ft
(1.2km) at 19,200bps;
TTL side: 10ft (3m) |
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Connector: |
TTL Side: DB-9
Male; RS485 Side: DB-9 Male;
Termination Board (TTL): DB-9
Female and a 3-way Terminal Block; Termination
Board
(RS485): DB-9 Female and a
4-Way Terminal Block |
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Maximum number
of drops: |
128 |
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End of Line
Terminator: |
120Ω
(Built-in) |
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Static
protection (ESD): |
Up to 15KV |
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Dimensions (H
x W x D): |
0.63 x 1.3
x 4.5 in (16 x 32 x
115 mm) (with
Termination Boards) |
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Weight: |
1.66 oz (47 g) (with Termination Boards) |
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Operating
Temperature: |
14ºF to
122ºF (-10ºC to
50ºC) |
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Operating
Humidity: |
Up to 90%
RH (no condensation) |
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TTL SIGNAL LEVELS |
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TTL Input |
TTL Output |
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High
(>2.0V) |
High
(>3.5V) |
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Low (<0.8V) |
Low (<0.6V) |
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CONNECTIONS |
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Figure 1: Master-Slave
Multi-Drop Connections |
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Figure 2: Extending
TTL Distance |
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