Intermec EasyCoder 501 - Page 155

Intermec EasyCoder 501 – Service Manual Ed. 7
154
Chapter 18 "uart1:"
18.4 20 mA Current
Loop, cont.
On the CPU board, check:
• Opto-couplers must be fi tted on IC-205 and IC-206. These are
not included as standard and must be ordered separately.
• Jumper must be fi tted on middle position of P-202 to select 20
mA current loop.
• Any RS-422 circuit fi tted on IC-207 (optional), RS-232 circuit
fi tted on IC-200 (standard), and jumpers fi tted on P-204 to
P-209 or on P-200 are of no consequence.
P-203 External 5 Volt:
Jumper fi tted connects +5V to pin 16. Caution! Max. 200 mA.
Be careful not to enable the external 5V unintentionally, which
may cause harm to the terminal, PC, or other device connected to
this port!
Cable Confi guration
The printer end of the connection cable should have a DB25
female connector. The computer end of the cable depends on your
type of computer.
The printer’s connector contains the following signals:
Pin 9 + 20 mA
Pin 10 – 20 mA
Pin 11 TXD +
Pin 12 TXD –
Pin 13 + 20 mA
*
Pin 14 – 20 mA
*
Pin 16 + 5V, 200 mA (if jumper fi tted on P-203)
Pin 18 RXD +
Pin 25 RXD –
*
. In case of printer being active receiver.